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Why Are Orthopedic Claims Being Denied? Global Period Errors, NCCI Bundling Issues & Fracture Care Coding Mistakes
A five-surgeon orthopedic practice in Sioux Falls, South Dakota was facing rising claim denials, declining reimbursement, and more than $212,000 in denied accounts receivable. Despite a 33% first-pass denial rate, monthly billing reports failed to identify the underlying problems, allowing the same specialty-specific billing errors to continue for more than three years.
When MZ Medical Billing conducted a comprehensive Orthopedic Billing Audit, we found the denials were caused by systemic billing failures rather than isolated coding mistakes. Post-operative visits were billed during 90-day global periods, multi-procedure arthroscopy claims failed NCCI bundling edits, fracture care was billed incorrectly, workers' compensation cases were sent to commercial payers, and payer-specific authorization requirements were routinely missed.
The audit also uncovered payer-specific billing issues across South Dakota. Wellmark denied global period violations, Sanford Health Plan and Avera Health Plans rejected claims for missing prior authorizations, Medicare global surgery and NCCI rules were applied incorrectly, and more than $212,000 in aging accounts receivable had remained untouched for up to nine quarters without documented appeals or meaningful follow-up.
This orthopedic billing case study explains how MZ Medical Billing corrected the root causes through Orthopedic Medical Billing Services, strengthened Denial Management, optimized Revenue Cycle Management, and recovered $212,000 in denied accounts receivable while increasing the clean claim rate to 96% within 90 days.
The Group We Walked Into
The practice is a five-surgeon orthopedic group with four physician assistants, operating across three sites in the Sioux Falls metropolitan area of South Dakota, a hospital-based surgical service, a freestanding ambulatory surgery center, and a clinic location with in-house X-ray, casting, durable medical equipment dispensing, and physical therapy. The group's case mix runs the full orthopedic spectrum: total joint arthroplasty, arthroscopic knee and shoulder surgery, spine consultations, sports medicine, hand surgery, and a steady flow of fracture care driven by South Dakota's agriculture, construction, and winter injury volume.
Orthopedic billing carries a rule set that general medical billing never touches. Nearly every surgical CPT in the orthopedic code range carries a 90-day global period, a window in which routine post-operative care is already paid inside the surgical fee. Billing an office visit inside that window without the correct modifier produces a denial at best and a payer refund demand at worst. Multi-procedure arthroscopy claims collide with NCCI bundling edits unless the code combinations, laterality modifiers, and distinct-procedure modifiers are exactly right. Fracture care has its own global billing methodology that most general billers have never used. The group's prior billing company, a generalist firm handling family medicine and behavioral health accounts, had been billing orthopedics as if it were office-based primary care. The AR showed the result.
South Dakota's payer landscape adds its own layer. The state's commercial market is dominated by Wellmark Blue Cross and Blue Shield of South Dakota, alongside the provider-sponsored plans of the two regional health systems — Sanford Health Plan and Avera Health Plans, each with its own prior authorization rules for advanced imaging and elective orthopedic surgery. South Dakota Medicaid operates through the Department of Social Services with its own fee schedule and documentation requirements, published in the state's official DSS Medicaid provider billing manuals — manuals the prior billing company had never once consulted. And South Dakota is one of the few states with no workers' compensation medical fee schedule — meaning work comp orthopedic claims are reimbursed at usual and customary rates, but only when they are correctly identified, routed, and documented as work comp from the first visit. The prior billing company had one uniform submission process for all of it.
The group's practice administrator contacted MZ Medical Billing after a year-end review showed a 33% first-pass denial rate and $212,000 in AR aging beyond 90 days. Our orthopedics billing team reviewed the first batch of remittances and identified the failure categories within 72 hours of receiving the data.
Six Orthopedic Billing Failures Compounding for Three Years
The billing audit covered 36 months of claim submissions. Every denial was pulled, categorized by CARC code, procedure type, payer, and dollar value. Six separate failure categories surfaced. None of them were subtle — all six were producing consistent, identifiable denial patterns that a specialist billing team would have caught in the first billing cycle.
Nearly every major orthopedic surgical code — total knee arthroplasty, rotator cuff repair, ORIF procedures — carries a 90-day global surgical package. Routine post-operative visits within that window are already reimbursed inside the surgical fee. The prior billing company had no global period tracking at all: every post-op visit was billed as a standalone E/M service. Payers denied most of them, and on the ones that slipped through, Wellmark and Medicare later issued refund demands. Visits that genuinely qualified for separate payment, unrelated problems (modifier 24) or staged returns to the OR (modifier 58) — were never distinguished from routine follow-ups, so legitimate revenue was being denied alongside the improper claims. Our medical practice audit flagged this pattern in the first week of the engagement.
Arthroscopic knee and shoulder surgeries routinely involve multiple procedures in the same session — meniscectomy with chondroplasty, rotator cuff repair with subacromial decompression. NCCI edits bundle many of these combinations unless the documentation supports a distinct procedural service reported with modifier 59 or the appropriate X-modifier, and unless laterality modifiers RT/LT correctly identify bilateral work. The prior billing company submitted every code on the operative report with no bundling review, no distinct-procedure modifiers, and inconsistent laterality. Payers paid the primary procedure and denied everything else. Proper medical coding for orthopedic surgery requires an NCCI review on every multi-procedure claim before submission — not after the denial arrives.
Closed fracture treatment has its own global billing methodology: a fracture care CPT code (for example, closed treatment of distal radius fracture) that includes the initial treatment plus 90 days of routine follow-up, paid at a substantially higher rate than an office visit. The prior billing company had never billed a fracture care code in 36 months. Every fracture — and this group treats fractures daily — was billed as an E/M visit plus a casting supply code, then follow-up visits were billed separately and frequently denied. The group was systematically underpaid on its highest-volume service line, and the underpayment never generated a denial code, so it was never flagged.
A significant share of the group's caseload is work-related injury — agriculture, construction, and industrial cases across the Sioux Falls region. Work comp claims must be routed to the employer's workers' compensation carrier with the claim number, date of injury, and employer information. The front desk was not capturing work comp details at check-in, and the prior billing company had no work comp routing process — so injury cases were billed to the patient's commercial health plan. Health plans denied them as work-related, the work comp carrier never received a bill, and the claims sat in AR unresolved. Because South Dakota has no workers' comp fee schedule, correctly routed claims are reimbursed at usual and customary rates — meaning the misrouted claims were also the group's best-paying claims.
Sanford Health Plan, Avera Health Plans, and Wellmark BCBS each require prior authorization for advanced imaging and most elective orthopedic surgeries — total joints, arthroscopy, spine procedures. The prior billing company had no authorization tracking system. MRIs performed on the group's in-house equipment and elective surgeries scheduled at the ASC were going out without auth numbers and denying on receipt, regardless of medical necessity. Rebuilding the prior authorization workflow — with payer-specific auth requirement lists checked at scheduling — was one of the first operational fixes we implemented.
The $212,000 in AR aging beyond 90 days had been carried forward on the practice's aging report every quarter without any appeal or resubmission activity. The prior billing company's month-end reports showed the balance as "in follow-up" — a status that was never updated because no follow-up was ever performed. Several Wellmark and Sanford timely filing and appeal windows were within weeks of closing when MZ began the engagement. Our immediate AR recovery triage identified and actioned every at-risk claim before any filing deadline expired.
Why Orthopedic Billing Demands Specialty Expertise
Orthopedic reimbursement is governed by rules that do not exist in office-based medicine: global surgical packages, NCCI procedure-to-procedure edits, fracture care methodology, multiple procedure payment reduction, and site-of-service distinctions. Each component has its own logic — and all of them interact on a single surgical claim.
Every surgical CPT carries a global period assigned by CMS — 0, 10, or 90 days. Major orthopedic procedures are almost all 90-day globals: the surgical fee includes the procedure, routine post-op visits, and typical wound care for the full window. Billing routine follow-ups separately inside the global produces denials and refund exposure. Billing legitimately separate services without the correct modifier produces lost revenue. Tracking which patient is inside which global window, for which procedure, until which date, is a core orthopedic billing function — not an optional one.
Six modifiers govern what is separately payable around a surgical global: 24 (unrelated E/M during the post-op period), 25 (significant, separately identifiable E/M on the day of a procedure), 57 (E/M resulting in the decision for major surgery), 58 (staged or related procedure during the post-op period), 78 (unplanned return to the OR for a related procedure), and 79 (unrelated procedure during the post-op period). Each has a distinct definition, distinct documentation requirements, and a distinct payment consequence. Using the wrong one — or none — turns payable services into denials.
The National Correct Coding Initiative maintains procedure-to-procedure edit pairs that bundle one code into another when performed in the same session. Orthopedic arthroscopy is dense with these edits — chondroplasty bundles into meniscectomy in the same compartment, decompression bundles into certain repairs. Where the work was genuinely distinct — different compartment, different site, different session — modifier 59 or the appropriate X-modifier unbundles it, but only with supporting documentation. Every multi-procedure orthopedic claim must be run against current NCCI edit tables before submission. Our claim submissions process includes an NCCI scrub on every surgical claim.
Closed fracture treatment codes include the initial treatment plus 90 days of routine follow-up care in a single global fee — reimbursed at rates far above an E/M visit. The alternative — itemized E/M plus casting — is only appropriate in limited circumstances, such as when the patient will follow up elsewhere. Choosing the right methodology per fracture, applying casting and supply codes correctly, and billing replacement casts during the global with the proper codes is fracture-specific knowledge that general billing teams simply do not carry.
When multiple procedures are performed in one session, payers apply multiple procedure payment reduction — typically 100% for the highest-valued procedure and 50% for subsequent ones. Correct sequencing by RVU value directly affects payment. Bilateral procedures require modifier 50 or RT/LT pairs depending on the payer's convention. Getting sequencing or bilateral reporting wrong underpays the claim silently — the payer processes it, pays the wrong amount, and no denial code ever appears. Our payment posting workflow verifies every multi-procedure payment against the expected reduction schedule.
Every orthopedic surgical claim must be supportable by an operative report that identifies each procedure performed, the compartment or anatomical site, laterality, and the medical necessity for each distinct service. Modifier 59 claims require documentation of the separate site or session. Modifier 24 claims require a note establishing the visit was unrelated to the surgery. Fracture care claims require the fracture pattern, treatment method, and follow-up plan. Our medical billing team reviews documentation completeness on every surgical case before the claim goes out.
How South Dakota's Payer Mix Affects Orthopedic Billing
South Dakota's payer environment is defined by one dominant commercial carrier, two health-system-owned plans with their own authorization ecosystems, a state Medicaid program with its own fee schedule, and a workers' compensation system with no medical fee schedule at all. Each applies its own rules on top of the CMS baseline — and the differences directly affect claim payment rates, modifier conventions, and authorization thresholds.
Wellmark Blue Cross and Blue Shield of South Dakota is the dominant commercial payer in the state and covers the largest share of the group's commercial case volume. Wellmark applies its own precertification list for elective orthopedic surgery and advanced imaging, its own multiple-procedure reduction schedule, and its own bilateral reporting convention. Wellmark also enforces its global period edits strictly — post-op E/M claims without modifier 24 documentation are denied on receipt, and paid claims found on post-payment review inside a global generate refund demands. The prior billing company's global period failures showed up most heavily in the Wellmark AR.
Sanford Health Plan and Avera Health Plans — the provider-sponsored plans of the two regional health systems that anchor South Dakota healthcare — each maintain their own prior authorization portals, their own orthopedic surgery auth lists, and their own advanced imaging management programs. An MRI that requires no auth under one plan requires it under the other. The prior billing company treated all three commercial payers identically, which guaranteed auth failures on at least one plan for every auth-required service. Rebuilding payer-specific insurance verification and authorization checks at scheduling eliminated this category of denial entirely.
South Dakota Medicaid, administered by the Department of Social Services, applies its own fee schedule, its own prior authorization requirements for elective procedures, and its own documentation standards for DME dispensed from the clinic. Medicare and Medicare Advantage volume — significant in a joint-replacement-heavy practice — follows CMS global period, NCCI, and multiple procedure rules strictly, and MA plans layer their own auth programs on top. Billing for South Dakota orthopedic groups means maintaining six distinct rule sets and applying the right one to every claim.
Workers' compensation is the distinctive piece. South Dakota is one of the few states with no workers' compensation medical fee schedule — work comp claims are reimbursed at usual and customary rates, negotiated where disputed, under the oversight of the South Dakota Department of Labor and Regulation. For an orthopedic group, this makes correctly identified work comp cases among the best-reimbursed claims in the mix — and makes misrouting them to a commercial health plan, as the prior billing company had been doing, a double loss: the health plan denies, and the well-paying work comp claim never gets billed at all.
Dominant commercial payer. Strict global period edits, own precertification list for elective surgery and imaging, own bilateral and multiple-procedure conventions. Post-payment global reviews generate refund demands.
Health-system-owned plan. Own prior auth portal and orthopedic surgery auth list. Advanced imaging management program — MRI without auth number is an auto-denial regardless of necessity.
Second health-system plan with its own auth ecosystem. Auth requirements differ from Sanford's for the same procedures — payer-specific checking at scheduling is mandatory.
State fee schedule differs from CMS rates. Prior auth required for elective procedures. Clinic-dispensed DME carries its own documentation and supplier requirements.
CMS global period, NCCI, and multiple procedure rules apply strictly. MA plans layer additional auth programs. Joint replacement volume makes this a high-dollar payer segment.
No state medical fee schedule — usual and customary reimbursement. Correct routing with claim number, injury date, and employer data determines whether these best-paying claims get paid at all.
The $212,000 — Where It Sat and What Was at Risk
Before a single appeal was filed, the entire AR aging balance was mapped by denial type and timely filing deadline. Urgency drove the sequencing — not dollar value.
The $51,000 aging beyond 180 days required immediate triage. Wellmark and the health-system plans enforce timely filing limits for initial claims and separate, shorter appeal windows measured from the denial date. For claims denied rather than returned as unprocessable, the appeal window was the operative deadline — and several Wellmark and Sanford claims were within two weeks of permanent unrecoverability when MZ began the engagement. The misrouted workers' comp claims were a separate urgency track: because they had never been billed to the correct carrier at all, they had to be assembled — claim number, employer, injury date, first report — and submitted before any applicable limitation ran. The old AR cleanup process we run for orthopedic groups maps every claim against its operative deadline before any action is taken — because sequencing by deadline rather than dollar value is what prevents permanent write-offs.
South Dakota Work Comp — The Best-Paying Claims Nobody Was Billing
Workers' compensation deserved its own recovery track in this engagement. In a no-fee-schedule state, orthopedic work comp claims reimburse at usual and customary rates — but only when the case is identified as work-related at the first visit and routed correctly from day one. This group was losing both ends of that equation.
South Dakota's workers' compensation system, overseen by the Department of Labor and Regulation, does not impose a medical fee schedule on providers. Charges are payable at usual and customary rates, with disputes resolved through the department's processes. For an orthopedic group treating agricultural, construction, and industrial injuries — fractures, crush injuries, rotator cuff tears, back injuries — this makes work comp one of the strongest payer categories in the entire mix. It also makes accurate front-end identification the single point of failure: a work comp case billed to a health plan is a claim that will be denied by the wrong payer and never paid by the right one.
The audit found 61 work-related injury cases over 36 months that had been billed to commercial health plans. Every one had denied with work-related-injury denial codes. None had ever been rebilled to a workers' compensation carrier, because the information needed to do so — employer name, carrier, claim number, date of injury — had never been collected. Our team worked each case individually: contacting employers and carriers to obtain claim numbers, assembling the injury documentation from the medical record, and submitting complete work comp claims with supporting operative and clinical notes. Where treatment relatedness was questioned, we provided the physician's causation documentation and used the department's dispute process where needed.
Going forward, a work comp intake protocol was built into the front desk workflow: every injury-related visit triggers a work-relatedness screening question, and any positive answer routes the case into a work comp registration path that captures employer, carrier, claim number, and injury date before the first claim is generated. The group's practice management workflow now treats work comp identification as a scheduling-stage function — not a billing-stage cleanup.
Work-related injuries billed to commercial health plans over 36 months — all denied, none ever rebilled to a work comp carrier.
Employer, carrier, claim number, and injury date obtained per case. Complete work comp claims assembled with operative and clinical documentation.
No fee schedule in South Dakota — correctly documented work comp claims paid at usual and customary rates, above commercial contracted rates.
Work-relatedness screening at every injury visit. Positive screens route to a work comp registration path before the first claim is generated.
Rebuilding Global Period Control — From Zero Tracking to a Per-Patient Calendar
The global period failures were the largest denial-and-refund category in the AR, so the fix got its own infrastructure. Every surgical patient now carries a global period record — procedure, global length, start date, end date, payer — that the billing system checks before any E/M or procedure claim is released.
Every surgical claim now creates a global period entry: patient, procedure, 10- or 90-day designation per the CMS global surgery indicator, start and end dates, and payer. Any subsequent charge for that patient is checked against open global windows before it is released. Routine post-op visits inside the window are captured for care documentation but not billed. This single control eliminated the group's largest denial category and its refund exposure simultaneously.
The flip side of global compliance is capturing what is legitimately payable inside the window: unrelated problems seen during the post-op period (modifier 24), unplanned returns to the OR (modifier 78), staged procedures (modifier 58), and unrelated procedures (modifier 79). The prior billing company had been losing these alongside the improper claims — payers denied everything, related or not, because nothing carried a modifier. The rebuilt workflow flags every in-global encounter for a coder review that asks one question: related or not — and applies the correct modifier with supporting documentation when it is not.
Wellmark and Medicare post-payment reviews had already generated refund demands on improperly paid in-global E/M claims. Rather than leaving the group exposed to escalating recoupment, we reconciled the historical in-global claims proactively: refunds processed where the visits were genuinely routine post-op care, and rebuttals filed with modifier 24 documentation where the visits were demonstrably unrelated. Closing the historical exposure on our terms — instead of the payers' audit timeline — protected the group's standing with its two largest payers. Our denial management team handled every rebuttal with claim-level documentation.
Every Revenue Cycle Function Applied to This Engagement
Recovering $212,000 from a 36-month orthopedic billing failure required every revenue cycle service working together. Below is how each service area contributed to the outcome — and how it now operates as part of the group's ongoing billing workflow.
Why a General Medical Billing Company Cannot Handle Orthopedics
- The prior billing company had no global period infrastructureGlobal surgical packages barely exist in office-based primary care, so a generalist billing team never builds the tracking systems orthopedics requires. Without a per-patient global calendar, every post-op encounter becomes a coin flip: bill it and risk a denial or refund demand, or hold it and lose legitimately payable revenue. This group got both outcomes simultaneously for three years.
- NCCI edits were never checked before submissionMulti-procedure orthopedic surgery is where NCCI edits concentrate. A billing team that submits every code on the operative report without running the combination against current edit tables is guaranteeing bundling denials on nearly every arthroscopy claim. Our medical coding team scrubs every surgical claim against NCCI tables — and applies 59/X modifiers only where documentation genuinely supports distinct services.
- Fracture care methodology was unknown to the billing teamFracture care global billing does not exist outside musculoskeletal medicine. A team that has never billed orthopedics professionally will default to E/M-plus-supplies on every fracture — not because they weighed the options, but because they do not know the fracture care code family exists. Over 36 months of daily fracture volume, this produced a silent underpayment on the group's highest-volume service line that never generated a single denial code.
- South Dakota's payer-specific rules were never researchedWellmark's precertification list, Sanford's and Avera's separate auth portals, South Dakota Medicaid's fee schedule, and the state's no-fee-schedule workers' comp system are all South Dakota-specific knowledge. A billing company that runs one uniform process across all payers will fail at least one payer's requirements on every auth-required or work-related case. South Dakota medical billing expertise means maintaining all six rule sets and applying the right one per claim.
- No payment variance review was in placeFracture care underbilling, multiple-procedure sequencing errors, and bilateral reporting mistakes never generate denials — they generate accepted claims at the wrong amount. Without a reconciliation process comparing received payments against expected amounts per the correct fee schedule and reduction rules, underpayments accumulate indefinitely. Our payment posting workflow includes an expected-versus-received variance check on every remittance batch.
- AR was reported but never workedThe prior billing company's monthly reports showed AR aging balances marked "in follow-up." The administrator received them and assumed they reflected work in progress. They did not. Reporting an AR balance is not the same as working it. Our write-offs recovery and AR management process requires documented action on every item — not just a number on a report.
How We Fixed It Step by Step
Triage came first. Day one, before the full audit was complete, the at-risk AR was being actioned. Every other step followed in sequence from the audit findings.
We pulled 36 months of claim submissions, every remittance document, and the full AR aging report. The $51,000 aging beyond 180 days was the first item on the action list — specifically the Wellmark and Sanford claims within two weeks of permanent unrecoverability, and the misrouted workers' comp cases that had never been billed to the right payer at all. Our medical practice audit team categorized every denial by CARC code, payer, and operative deadline before any other action was taken. By the end of day two, every at-risk claim had an assigned action and a responsible team member.
- All $51K at-risk claims mapped against filing and appeal deadlines within 48 hours
- Six denial categories identified and dollar-value attributed
- Full audit report delivered to practice administrator before week two
We built the group's orthopedic-specific billing framework from scratch: a per-patient global period calendar covering every surgical case, an NCCI scrubbing step on every multi-procedure claim, a payer-specific modifier matrix covering Wellmark, Sanford, Avera, South Dakota Medicaid, Medicare, and workers' comp, and a fracture care protocol that selects global versus itemized methodology per fracture based on the clinical scenario. The coding rebuild was implemented in the billing system before the first corrected claim was submitted. Our medical coding team ran every code set through a compliance check against CMS global surgery and NCCI policy before going live.
- Per-patient global period calendar live for every surgical case
- NCCI scrub and payer-specific modifier matrix deployed in billing system
- Fracture care protocol — global methodology applied to 100% of qualifying fractures going forward
Bundling denials on multi-procedure arthroscopy claims were appealed with the operative report, compartment and site documentation, and the correct modifier assignment supported by NCCI policy citations. Global period E/M denials were split into two tracks: routine post-op visits were closed without appeal (they were correctly denied), while genuinely unrelated visits were appealed with modifier 24 documentation from the medical record. Every appeal was tracked in a claim-level log updated daily. Our denial management team maintained payer-specific escalation contacts for Wellmark, Sanford, and Avera and used them when standard appeal processing stalled.
- Bundling appeals filed with operative documentation and NCCI policy references
- Global period claims triaged honestly — correct denials closed, unrelated visits appealed with modifier 24 support
- Daily claim-level tracking log maintained through full resolution
Each of the 61 misrouted work comp cases was reconstructed individually: employer and carrier identified, claim number obtained, injury date and first-report documentation assembled, and a complete workers' compensation claim submitted with the operative and clinical record. Because South Dakota imposes no work comp fee schedule, correctly documented claims were reimbursed at usual and customary rates — making this recovery track the highest per-claim yield in the engagement. Disputed relatedness cases were supported with physician causation documentation. Going forward, the front-desk work comp screening protocol routes every injury case correctly from the first visit.
- All 61 misrouted cases reconstructed with carrier, claim number, and injury documentation
- Usual and customary reimbursement obtained under South Dakota's no-fee-schedule system
- Work comp screening protocol embedded at check-in for every injury visit
For Sanford, Avera, and Wellmark denials related to missing prior authorizations on imaging and elective surgeries, we submitted retroactive authorization requests with clinical documentation demonstrating medical necessity. Retroactive auth was approved on 22 of 31 affected surgical cases; six more were overturned through peer-to-peer review. Going forward, a payer-specific prior authorization check was built into the scheduling workflow: every MRI order and every elective surgical booking triggers an auth-requirement lookup against the correct payer's current list before the service is scheduled, with insurance verification confirming the active plan first.
- 22 of 31 auth-denied surgical cases recovered through retroactive authorization
- 6 additional cases overturned through peer-to-peer review
- Payer-specific auth lookup integrated into imaging orders and surgical scheduling
The final phase rebuilt every workflow that had failed: daily payment posting with expected-versus-received variance flagging against each payer's fee schedule and multiple-procedure reduction rules, weekly AR aging review with zero tolerance for items aging past 60 days without documented action, and a monthly payer policy review covering all six payers in the group's mix. Our full revenue cycle management takeover meant the group's practice administrator received a single weekly report showing clean claim rate, denial rate, AR aging, and payment variance — rather than a stack of unexplained numbers. The group's patient billing process was also restructured so surgical cost estimates reflect the actual global package, site of service, and the patient's real benefit design.
- Expected-versus-received payment variance review on every remittance batch
- Weekly single-page executive report: clean claim rate, denial rate, AR aging, payment variance
- Zero items aging past 60 days without documented action
- 96% clean claim rate on new submissions within 90 days of workflow rebuild
How the Recovery Unfolded — Day One to Steady State
A $212,000 recovery does not happen in one motion. It happens in phases, each with its own deliverable and its own measurable checkpoint. This is the actual sequence the engagement followed.
Every claim in the $51K critical bucket was actioned before its operative deadline: appeals filed on Wellmark and Sanford denials approaching their appeal windows, and initial claims assembled for the misrouted workers' comp cases. Not one claim was lost to a filing deadline after engagement start. Simultaneously, the full 36-month audit ran in parallel so the systemic fixes could begin from a complete picture.
The global period calendar, NCCI scrubber, modifier matrix, and fracture care protocol went live in the billing system. New claims began submitting under the corrected framework while the historical correction queue — bundling appeals, modifier 24 appeals, and work comp reconstructions — moved through payer processing. First recoveries posted in this window: the earliest bundling appeals and retroactive auth approvals began paying.
By day 90, the first-pass denial rate on new submissions had fallen from 33% to under 5% — the corrected coding framework eliminating the six failure categories at the source. Appeal volume peaked in this window as the full historical queue moved through Wellmark, Sanford, Avera, and Medicaid processing. The clean claim rate on new submissions reached 96% and held. Peer-to-peer reviews on the contested auth cases concluded, adding six more overturned surgical claims to the recovery.
The workers' comp reconstructions — the slowest track because each required carrier coordination — completed payment in this window at usual and customary rates. The historical global period exposure was fully reconciled with Wellmark and Medicare: refunds processed where owed, rebuttals sustained where the record supported separate payment. By day 180, the full $212,000 had been recovered, refunded correctly, or resolved, with zero items left in unworked status.
The engagement transitioned to steady-state revenue cycle management: weekly executive reporting, payment variance review on every remittance batch, weekly AR discipline, and a monthly review of all six payers' policy updates — because Wellmark's precertification list, the health-system plans' auth programs, and NCCI edit tables all change on their own schedules, and staying current is what keeps the denial rate under 5%.
Performance Compared Directly
| Area | Before Intervention | After Resolution | Business Impact |
|---|---|---|---|
| Global Surgery Periods | Zero global period tracking. Every post-op visit billed as standalone E/M — denials on most, refund demands on the rest. Legitimately payable unrelated visits denied alongside them. | Per-patient global calendar live. Routine post-op care held; unrelated and staged services billed with modifiers 24/58/78/79 and supporting documentation. Historical exposure reconciled proactively. | Largest denial category eliminated — refund exposure closed — legitimately payable in-global services now captured |
| NCCI Bundling | Every code from the operative report submitted with no edit review, no 59/X modifiers, inconsistent RT/LT. Secondary procedures denied on nearly every multi-procedure claim. | NCCI scrub on every surgical claim. Distinct-procedure modifiers applied only where documentation supports them. Laterality reported per payer convention. | $62,000 in bundling denials recovered through documented appeals — bundling denial category eliminated on new claims |
| Fracture Care | Fracture care global codes never used in 36 months. Every fracture billed as E/M plus casting supplies — chronic silent underpayment on the highest-volume service line. | Fracture care protocol implemented. Global methodology applied per qualifying fracture; itemized billing reserved for the limited scenarios where it is correct. | Highest-volume service line now reimbursed at fracture care global rates — revenue increase on every qualifying case going forward |
| Workers' Compensation | 61 work-related injury cases billed to commercial health plans — all denied as work-related, none ever billed to the correct carrier. No injury screening at intake. | All 61 cases reconstructed and billed to workers' comp carriers at usual and customary rates. Work comp screening protocol embedded at check-in. | $50,000 recovered from misrouted work comp cases — the group's best-paying claims now routed correctly from visit one |
| Prior Authorization | No auth tracking for Wellmark, Sanford, or Avera. MRIs and elective surgeries submitted without auth numbers — auto-denials regardless of medical necessity. | Retroactive auth on 22 of 31 surgical cases; 6 more overturned peer-to-peer. Payer-specific auth lookup at imaging order and surgical scheduling. | $27K+ in auth denials recovered — future auth errors eliminated at the scheduling stage |
| Payment Accuracy | No expected-versus-received review. Multiple-procedure sequencing and bilateral reporting errors underpaying claims silently with no denial codes to flag them. | Payment variance check on every remittance batch against fee schedules and reduction rules. Sequencing by RVU value enforced at claim creation. | Silent underpayments surfaced and corrected — every multi-procedure claim now paid at the correct reduction schedule |
| AR Management | $212K in AR labeled "in follow-up" for up to 9 quarters. Zero appeals filed by prior billing company. Practice administrator receiving reports with no underlying action. | Full AR audit and triage on day one. Every item actioned — appeals, reconstructions, retroactive auths, reconciliations. Weekly AR review implemented. | $212K recovered. 85% denial rate reduction. Zero items aging past 60 days without documented action going forward. |
Braces, Imaging, and Therapy — The Ancillary Revenue the Audit Also Fixed
An orthopedic clinic with in-house X-ray, DME dispensing, and physical therapy carries three additional billing disciplines beyond the surgical claims. The audit extended into all three — and found the same pattern: services delivered correctly, billed incorrectly or not at all.
Clinic-dispensed braces, splints, and orthoses bill under HCPCS L-codes with their own documentation requirements: the prescribing note, medical necessity, and — for Medicare — proper DMEPOS supplier standards and Advance Beneficiary Notices where coverage is uncertain. The audit found braces dispensed with no charge captured at all in some months, and Medicare brace claims denied for missing documentation in others. A dispensing log tied to charge capture now ensures every dispensed item generates a correctly documented claim — and a signed ABN where Medicare coverage rules require one.
In-house X-ray billing requires correct component reporting — global versus technical and professional splits depending on who interprets — and repeat films during fracture follow-up must be billed consistently with the fracture care global methodology. Advanced imaging routed to the group's equipment must clear the payer-specific auth check before the scan, not after. The rebuilt workflow ties imaging orders to the same auth lookup used for surgical scheduling, and component reporting was standardized per payer.
In-house PT bills timed therapeutic codes governed by the 8-minute rule for Medicare, therapy modifiers, plan-of-care certification requirements, and payer visit limits that must be tracked against authorizations. The audit found timed units calculated inconsistently and plan-of-care recertifications lapsing — both producing preventable denials. Unit calculation was standardized, and a certification tracker now flags every plan of care before it lapses. Our medical billing team reviews therapy claims against visit-limit and certification status before release.
What This Engagement Proves
Orthopedic billing is not a subset of general medical billing — it is a distinct specialty built on global surgical packages, NCCI edit management, fracture care methodology, multiple-procedure payment rules, and payer-specific authorization ecosystems. A billing company that accepts an orthopedic account without this specific training will produce exactly what happened here: systematic errors across every claim type that compound silently for years before anyone identifies the pattern.
Underpayments are more dangerous than denials in orthopedic billing — because they don't generate denial codes. Fracture care billed as E/M, multi-procedure claims sequenced wrong, and bilateral work reported incorrectly all produce accepted claims at the wrong amount. Without a payment variance review comparing received payments against the correct fee schedule and reduction rules on every remittance batch, these losses accumulate indefinitely.
Global period errors cut in both directions. Billing routine post-op visits inside the global creates denials and refund exposure; failing to bill legitimately unrelated services with modifier 24 support loses real revenue. Only a per-patient global calendar plus a coder review of every in-global encounter captures both sides correctly. A practice with no global tracking is guaranteed to be losing money on one side of that line — this group was losing on both.
South Dakota's payer environment is not interchangeable with any other state's. Wellmark's precertification list, Sanford's and Avera's separate auth ecosystems, South Dakota Medicaid's fee schedule, and the state's no-fee-schedule workers' compensation system are all South Dakota-specific. Billing for South Dakota orthopedic groups requires maintaining all six rule sets and applying the right one to every claim — not running one uniform process and hoping.
In a no-fee-schedule workers' comp state, front-desk injury screening is a revenue function. Work comp orthopedic claims reimburse at usual and customary rates — often above commercial contracted rates — but only when the case is identified and routed correctly from the first visit. A misrouted work comp case is a double loss: the health plan denies it, and the well-paying claim never reaches the carrier that owes it. Sixty-one cases at this group proved the point.
A monthly billing report that shows an AR aging balance is not evidence that the AR is being worked. Orthopedic groups receiving monthly reports from their billing company should ask specifically: what appeals were filed this month, on which claims, for which denial reasons, and what were the outcomes? If the billing company cannot answer with claim-level detail, the AR is not being worked — it is being reported. Our medical practice audit process starts with exactly that question.
Questions Orthopedic Groups Ask About This Case
The questions below are the ones South Dakota orthopedic practices ask most often when they read this case study — answered the same way we answered them for this group.
No. A well-run orthopedic billing operation runs first-pass denial rates in the low single digits. High denial rates in orthopedics almost always trace to a small number of systematic causes — global period failures, NCCI bundling misses, missing authorizations, and modifier errors — all of which are identifiable in one audit cycle and fixable at the source. If your billing company tells you 30%+ is normal for the specialty, that statement itself is the finding.
It depends entirely on where each claim sits against its operative deadline — timely filing for unbilled or returned claims, and the appeal window for formally denied ones. That is why the first 48 hours of every engagement are spent mapping deadlines, not filing appeals. Claims inside their windows with correctable errors — wrong codes, missing modifiers, missing auth that can be obtained retroactively, misrouted payer — recover at high rates. Claims past every deadline generally do not, which is exactly why unworked AR sitting in "follow-up" status for quarters is so costly.
Yes — when they are genuinely outside the global package: an unrelated problem (modifier 24), a staged or related procedure planned in advance (modifier 58), an unplanned return to the operating room (modifier 78), or an unrelated procedure (modifier 79). Each requires documentation in the record supporting the modifier. What cannot be billed is routine post-operative care, which is already paid inside the surgical fee. The discipline is in distinguishing the two on every in-global encounter — not defaulting to billing everything or holding everything.
South Dakota does not impose a workers' compensation medical fee schedule, so properly documented work comp claims are reimbursed at usual and customary rates, with disputes handled through the Department of Labor and Regulation's processes. In practice this makes work comp one of the strongest payer categories for an orthopedic group — provided the case is identified as work-related at intake, the carrier and claim number are captured before billing, and the causation documentation is complete. The reimbursement advantage only exists for claims that reach the right payer.
Yes. Each maintains its own authorization list, its own portal, and its own advanced imaging management program — and they do not match. An MRI or elective arthroscopy that requires no auth under one plan may require it under another, and the lists change during the year. The only reliable protection is a payer-specific auth lookup performed at the moment of scheduling, tied to a current version of each payer's list — which is exactly what our prior authorization workflow does.
Not when the transition is run correctly. In this engagement, at-risk AR triage began on day one — before the full audit was complete — so no claim was lost to a deadline during the handover. New claims began flowing under the corrected coding framework by day 15, and the historical recovery ran in parallel with current billing rather than instead of it. A specialist transition protects both the past (the AR) and the present (current submissions) simultaneously. The full revenue cycle management takeover is sequenced precisely so revenue never pauses.
"The problem here was not that the prior billing company made mistakes — it's that they made the same mistakes on every orthopedic claim for 36 months without ever identifying them. Post-op visits billed inside 90-day globals with no modifiers. Multi-procedure claims submitted without a single NCCI check. Fracture care — the group's highest-volume service — never once billed with fracture care codes. Workers' comp cases sent to health plans in a state where correctly routed work comp pays at usual and customary rates. And $212,000 in AR carrying an 'in follow-up' status that meant exactly nothing. We fixed every error, corrected every code, worked every denied claim, and built the billing infrastructure that should have been in place from the first day the group's cases went to billing."MZ Medical Billing — Orthopedics Billing Case Summary, South Dakota 2025–2026
Three Years. Same Errors Every Month.
MZ Found $212,000 and Fixed Every One of Them.
I have managed this orthopedic group for nine years. I knew our denial rate was too high, and I knew the AR number kept growing, but every month I was told the claims were "in follow-up" and that orthopedics is just a hard specialty to bill. Part of that is true — it is a hard specialty. That is exactly why it needed a specialist, and we didn't have one.
When MZ Medical Billing ran the audit, the findings were embarrassing in how basic they were. Every post-operative visit — every single one — was being billed as a separate office visit inside the 90-day global. Payers were denying them, and Wellmark had started sending refund demands on the ones that got paid. Our multi-procedure arthroscopy claims were losing the second and third procedures on nearly every case because nobody was checking bundling edits or applying modifiers. And fracture care — we treat fractures every day of the week — had never once been billed with a fracture care code. Three years of our highest-volume service billed as office visits.
The workers' comp finding was the one that made me angriest. Sixty-one injury cases billed to people's health insurance instead of their employer's work comp carrier. In South Dakota, work comp pays usual and customary — those were our best claims, and they were going to the wrong payer and dying there.
MZ recovered $212,000. The denial rate went from 33% to under 5%. The clean claim rate is 96%. Fracture care is billed correctly, work comp cases are caught at the front desk, and I get one weekly report that actually tells me what happened — appeals filed, claims paid, variance flagged. I should have made this change three years ago, because that is exactly how long we were paying for billing that wasn't happening.
Is Your Orthopedic Group Getting the Revenue It Earned?
Global period errors, NCCI bundling denials, unbilled fracture care, misrouted workers' comp cases, missing authorizations, and unworked AR all cost orthopedic groups real money on every billing cycle. MZ Medical Billing's orthopedic-specialist team can audit your current billing, identify every gap, and take over the full revenue cycle.
Schedule a Free Orthopedic Billing Audit