Orthopedic Billing Best Practices: Modifiers, Implants & Surgical Coding

Orthopedic surgery is one of the most financially complex specialties in medicine. Between 90-day global periods, bilateral procedure rules, implant invoice requirements, spine surgery bundling edits, and the ever-shifting landscape of workers' compensation billing, orthopedic billing demands specialty expertise that generalist billers simply cannot provide.

The financial stakes are high: a single missed add-on code in a complex spine case can cost $800–$2,000; systematic bilateral modifier errors can generate six-figure overpayments triggering audits; and improper implant billing can result in both revenue losses and compliance exposure.

This guide covers the most important orthopedic billing rules, common coding errors that cost practices thousands per month, and proven strategies to maximize reimbursement for every procedure your surgeons perform.

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Understanding the Surgical Global Period in Orthopedics

The global surgical period is the single most important concept in orthopedic billing. It defines a bundle of related services — the surgery itself plus all routine pre- and post-operative care — that are paid as a single unit.

90-Day Global (Major Orthopedic Surgery)

Applies to most orthopedic procedures:

• Total joint replacements (knee, hip, shoulder, ankle)
• ACL and rotator cuff repairs
• Spinal fusions and instrumented procedures
• Open fracture reductions (ORIF)
• Osteotomies
• Major tendon/ligament repairs

The 90-day window: Begins the day before surgery and extends 90 days post-operatively. During this window, any services related to the original procedure — post-op office visits, wound checks, staple removal, X-ray review — are bundled into the surgical fee. You cannot bill for these separately without a modifier.

10-Day Global (Minor Orthopedic Surgery)

Applies to smaller procedures:

• Carpal tunnel release (64721)
• Trigger finger release (26055)
• Ganglion cyst excision (25111, 26160)
• De Quervain's release (25000)
• Minor tendon releases and repairs
• Small joint aspiration with longer recovery (some codes)

0-Day Global (Procedures and Injections)

No global period — each encounter is independently billable:

• Joint injections (20600, 20605, 20610)
• Diagnostic aspirations
• Tendon sheath injections

Billing During the Global Period (When It's Allowed)

Not every service during the global window is bundled. You CAN bill separately when:

Situation	Modifier	When to Use
Unrelated E/M (different diagnosis)	-24	Knee replacement patient presents with upper respiratory infection
Unrelated procedure during global	-79	Knee patient falls and fractures wrist during global window
Return to OR for complication (related)	-78	Post-op wound infection requiring OR debridement
Staged/related second procedure	-58	Planned second-stage spine reconstruction
Decision for major surgery at E/M	-57	Acute fracture — surgeon evaluates and immediately decides on ORIF

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Core Orthopedic CPT Code Families

Total Joint Replacement

CPT Code	Procedure	Global Period	2026 Medicare RVU (Prof)
27447	Total knee arthroplasty (TKA)	90 days	~27.0 RVU
27130	Total hip arthroplasty (THA)	90 days	~26.3 RVU
27132	Revision THA, one component	90 days	~30.2 RVU
27134	Revision THA, both components	90 days	~34.1 RVU
27487	Revision TKA, all components	90 days	~31.8 RVU
23472	Total shoulder arthroplasty	90 days	~22.7 RVU
23473	Revision shoulder arthroplasty, without glenoid	90 days	~25.0 RVU

Implant revenue: Joint replacement implants represent a major cost that must be separately recovered. A total knee implant system may cost $8,000–$18,000. In the non-Medicare outpatient setting, this is billed using HCPCS codes (e.g., L8699 for prosthetic implant not otherwise classified, or specific L-codes) with the invoice as supporting documentation.

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Knee Arthroscopy

CPT Code	Procedure	Global Period
29870	Knee arthroscopy, diagnostic	90 days
29871	Knee arthroscopy, irrigation for infection	90 days
29873	Knee arthroscopy, lateral release	90 days
29874	Knee arthroscopy, loose body removal	90 days
29875	Knee arthroscopy, synovectomy, limited	90 days
29876	Knee arthroscopy, synovectomy, major	90 days
29877	Knee arthroscopy, chondroplasty	90 days
29879	Knee arthroscopy, abrasion arthroplasty	90 days
29880	Knee arthroscopy, meniscectomy (medial AND lateral)	90 days
29881	Knee arthroscopy, meniscectomy (medial OR lateral)	90 days
29882	Knee arthroscopy, meniscus repair (1 meniscus)	90 days
29883	Knee arthroscopy, meniscus repair (2 menisci)	90 days
29884	Knee arthroscopy, drilling/microfracture	90 days
29885	Knee arthroscopy, drilling for osteochondritis dissecans	90 days
29887	Knee arthroscopy, osteochondral autograft (OATS)	90 days
29888	ACL reconstruction via arthroscopy	90 days
29889	PCL reconstruction via arthroscopy	90 days

Critical bundling rules for knee arthroscopy:

• You can only bill the highest-level arthroscopic code for work done in a joint. Diagnostic arthroscopy (29870) is bundled into any therapeutic code — never bill 29870 alongside a therapeutic knee arthroscopy.
• 29877 (chondroplasty) is bundled into 29880, 29881, 29882, 29883, 29888. Do not add it separately.
• When both medial AND lateral meniscectomy are performed: bill 29880 (both menisci) — NOT 29881 twice.
• If meniscectomy AND ACL reconstruction: bill 29888 + 29881 with modifier -51 on 29881.

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Shoulder Arthroscopy

CPT Code	Procedure	Global Period
29805	Shoulder arthroscopy, diagnostic	90 days
29806	Bankart repair (capsulorrhaphy)	90 days
29807	SLAP repair	90 days
29819	Removal of loose body	90 days
29820	Synovectomy, limited	90 days
29821	Synovectomy, complete	90 days
29822	Debridement, limited	90 days
29823	Debridement, extensive	90 days
29824	Distal clavicle excision	90 days
29825	Lysis of adhesions (adhesive capsulitis)	90 days
29826	Subacromial decompression/acromioplasty	90 days
29827	Rotator cuff repair	90 days
29828	Biceps tenodesis	90 days

Key shoulder bundling issues:

• 29826 (subacromial decompression) is frequently performed alongside 29827 (rotator cuff repair). Many payers bundle 29826 into 29827 — check payer-specific NCCI edits. If billing both, append modifier -59 to 29826 with strong documentation of separately identifiable work.
• 29823 (debridement, extensive) vs. 29822 (debridement, limited): The distinction must be documented — what tissue was debrided, how extensively, and why "extensive" classification is justified.

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Spine Surgery

Spine surgery has among the most complex coding rules in orthopedics. The base approach code is paired with specific procedure codes, and additional instrumentation codes are stacked as add-ons.

Fusion Codes (by approach and segment):

CPT Code	Procedure	Global Period
22612	Posterior lumbar interbody fusion (PLIF), one level	90 days
22614	PLIF, each additional level (add-on)	ZZZ
22630	PLIF (posterolateral interbody), one level	90 days
22632	PLIF (posterolateral), each additional level (add-on)	ZZZ
22633	PLIF combined anterior/posterior approach, one level	90 days
22634	Combined AP interbody fusion, additional level (add-on)	ZZZ
22551	ACDF, one level (anterior cervical discectomy + fusion)	90 days
22552	ACDF, each additional level (add-on)	ZZZ
22554	Anterior cervical fusion without discectomy	90 days

Instrumentation Add-On Codes:

CPT Code	Description
22840	Posterior segmental instrumentation, 2–3 vertebral segments
22841	Posterior segmental instrumentation, 4–7 segments
22842	Posterior segmental instrumentation, 8+ segments
22845	Anterior instrumentation, 2–3 segments
22847	Anterior instrumentation, 4+ segments
22851	Intervertebral biomechanical device (interbody cage), add-on
22853	Insertion of interbody biomechanical device, single level
22854	Insertion of interbody biomechanical device, each additional level

Spinal decompression codes (often accompany fusion):

CPT Code	Description
63047	Laminectomy with decompression, one level
63048	Laminectomy, each additional level (add-on)
63030	Hemilaminotomy with discectomy, one level
63035	Hemilaminotomy, each additional level (add-on)
22551	ACDF
22600	Posterior cervical fusion, one level

Bone graft codes (separate from fusion codes):

CPT Code	Description	Bundling Status
20930	Allograft, morselized	Often separately payable
20931	Allograft, structural	Often separately payable
20936	Local autograft (same site), morselized	Bundled with fusion
20937	Autograft, morselized (separate incision)	Check payer edits
20938	Structural autograft	Often separately payable

Spine surgery billing key rules:

1. Bill the fusion code + all applicable instrumentation add-ons (22840 series) + interbody device (22853/22854) + bone graft code.
2. If decompression is performed separately from the fusion, bill decompression codes alongside fusion codes.
3. Many payers require a separate, specific prior authorization for each multilevel construct — auth for one level does not cover three levels.
4. Check CCI edits for every code combination in complex spine cases.

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Fracture Care

Fracture care coding depends on whether fracture management is closed (non-surgical), percutaneous, or open (surgical/ORIF).

Key concepts:

• Closed fracture treatment: Conservative management with casting or splinting, no surgery. Global periods typically 90 days.
• Open fracture treatment (ORIF): Surgical exposure and internal fixation. 90-day global.
• Percutaneous fracture fixation: Pins or screws placed without open exposure. 90-day global for most.

Common Fracture CPT Codes:

CPT Code	Fracture	Treatment	Global
27750	Tibial shaft fracture, closed	Closed, without manipulation	90 days
27756	Tibial shaft fracture, closed	Closed, with manipulation	90 days
27758	Tibial shaft fracture	ORIF (plating)	90 days
27236	Femoral neck fracture	Surgical (ORIF or hemi-arthroplasty)	90 days
25600	Distal radius fracture	Closed, without manipulation	90 days
25600	Distal radius fracture	Closed, with manipulation (25605)	90 days
25607	Distal radius fracture	Percutaneous fixation	90 days
25608	Distal radius fracture	ORIF, single fragment	90 days
25609	Distal radius fracture	ORIF, multiple fragments	90 days
29505	Long leg splint application	Splint only (no fracture code)	0 days
29515	Short leg splint	Splint only	0 days

Important: Casting and splinting codes (29000–29590 series) can be billed separately from closed fracture treatment codes ONLY when the cast or splint is applied at a different visit or by a different provider. If the orthopedist applies the cast at the same time as the fracture treatment, the cast application is bundled.

Fracture care and E/M: When a patient presents acutely with a fracture, the initial evaluation can be billed as an E/M (modifier -57 for major surgery decision) or as the fracture care code, depending on payer policy. For Medicare, E/M + fracture care code on the same day requires modifier -25 on the E/M.

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Hand and Upper Extremity Surgery

CPT Code	Procedure	Global Period
64721	Carpal tunnel release, endoscopic or open	10 days
26055	Trigger finger release	10 days
25000	De Quervain's tendon sheath incision	10 days
26115	Excision, tumor, tendon/bone, subcutaneous	10 days
26160	Ganglion cyst excision, hand/wrist	10 days
25111	Excision of ganglion, wrist	10 days
26418	Primary repair of flexor tendon, zone 1 or 2	90 days
26420	Primary repair of flexor tendon, zone 3, 4, or 5	90 days
26410	Primary repair of extensor tendon, primary	90 days

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Modifier Mastery: The Essential Orthopedic Modifiers

Orthopedic billing uses more modifiers than almost any other specialty. Getting them right is the difference between proper payment and denial or recoupment.

Bilateral Procedure Modifiers: -50, -LT, -RT

When both sides of the body are operated on simultaneously:

Medicare: Append modifier -50 to the procedure code and bill one line item at 150% of the single-procedure rate (100% for first side + 50% for second).

Most commercial payers: Bill two separate line items — one with modifier -LT (left side) and one with modifier -RT (right side). Many commercial payers pay 100% + 100% for bilateral procedures, unlike Medicare's 150% cap.

Critical error: Applying the same bilateral billing approach for all payers. Always check each payer's bilateral procedure rules in their provider manual. Billing Medicare with LT/RT lines instead of -50 will cause the claim to deny or process incorrectly.

Revenue impact of bilateral billing errors: For a bilateral total knee replacement (27447) with a Medicare rate of ~$1,500 professional fee per knee:

• Correct -50 billing: $1,500 × 150% = $2,250
• Incorrect (billing 27447 twice without modifier): may result in one denial or overpayment scrutiny

Multiple Procedure Modifier: -51

When multiple procedures are performed in the same surgical session, append modifier -51 to all secondary and tertiary procedures (not the highest-valued primary procedure).

Medicare payment under -51: 100% of highest-value procedure + 50% of each additional procedure.

Exceptions — do NOT use -51:

• Add-on codes (marked with "+" in CPT, e.g., 22614, 22632) — always paid at 100%
• Procedures exempt from -51 payment reduction (listed in CPT appendix E)

Co-Surgery Modifier: -62

When two surgeons each actively participate in a procedure simultaneously (e.g., complex spine deformity surgery with anterior and posterior approach by different surgeons), both surgeons bill with modifier -62. Each is paid at 62.5% of the procedure fee (total: 125%).

Documentation requirement: Both surgeons must document distinct components they performed. "Primary surgeon performed [specific steps]; assisting surgeon performed [specific steps]."

Assistant Surgeon Modifiers: -80, -81, -82

• -80: Assistant surgeon — fully qualified surgeon who assists throughout
• -81: Minimum assistance — surgeon who assists for a portion only
• -82: Assistant surgeon when qualified resident unavailable (teaching hospital)

Coverage limitation: Many commercial payers and Medicare require medical necessity documentation before approving assistant surgeon fees for specific procedures. Not all procedures automatically qualify.

Distinction: Modifier -59 vs. -X{EPSU} Modifiers

Modifier -59 (Distinct Procedural Service) indicates a procedure is separate and distinct from another procedure billed on the same day that would otherwise be bundled.

X-modifiers (more specific replacements for -59):

• -XE: Separate encounter
• -XP: Separate practitioner
• -XS: Separate structure (distinct anatomic location)
• -XU: Unusual non-overlapping service

For orthopedics, -XS is most commonly applicable when billing two procedures on different anatomic sites that would otherwise appear bundled (e.g., shoulder and elbow procedures on the same patient in the same session).

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Implant Billing: Recovering Orthopedic Hardware Costs

Orthopedic hardware (joint prostheses, screws, plates, rods, anchors, bone graft substitutes) represents a significant cost center that must be recovered through billing.

Medicare Implant Billing Rules

Hospital outpatient/ASC setting: Medicare APC rates include implant costs for most procedures. However, Medicare's device pass-through payment program allows separate billing for newly approved devices not yet incorporated into APC rates. Check the Medicare device pass-through list quarterly.

Office-based setting: In physician office procedures, implants may be separately billable with appropriate HCPCS codes and invoice documentation.

HCPCS codes for orthopedic implants:

• L8699 — Prosthetic implant, not otherwise classified (requires invoice)
• C1713 — Anchor/screw for opposing bone-to-bone or soft tissue-to-bone (hospital outpatient)
• C1776 — Joint device (implantable) (hospital outpatient)
• C1829 — Tibial component of knee joint prosthesis (ASC)
• L5100–L5999 — Lower limb prosthetics if applicable

Commercial Payer Implant Billing

Most commercial payers reimburse implants in the outpatient setting based on invoice cost plus a markup allowance. Requirements:

1. Original implant invoice (itemized: product name, manufacturer, lot/serial number, quantity, cost)
2. Operative report documenting the device was placed
3. HCPCS code corresponding to the device
4. Some payers require the invoice to be attached to the claim electronically

Error to avoid: Submitting a summary "materials cost" without the itemized device-level invoice. Most payers will deny "implant/device, NOS" without supporting documentation.

Bone Graft Billing

CPT Code	Description	Separately Billable?
20930	Allograft, morselized	Usually yes — with invoice
20931	Allograft, structural	Usually yes — with invoice
20936	Local autograft (same incision)	No — bundled with primary
20937	Autograft, morselized (separate incision)	Check payer edits
20938	Autograft, structural (requires separate incision)	Often separately payable

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Prior Authorization in Orthopedic Surgery

Orthopedic procedures have high prior authorization rates — often 80–90% of surgical cases require authorization from commercial or Medicare Advantage plans.

High-Authorization Procedures

• All total joint replacements (knee, hip, shoulder)
• All spine surgeries (fusion, decompression, cervical or lumbar)
• Rotator cuff repair and labral repairs
• ACL and PCL reconstructions
• Arthroscopic procedures for Medicare Advantage (many plans)
• Advanced imaging (MRI, CT) prior to surgery

What Authorization Must Cover

Exact CPT codes: Authorization for 27447 (TKA) does NOT cover 27134 (bilateral TKA revision). If the surgeon decides on a more complex reconstruction intraoperatively, call the payer immediately.

Rendering provider NPI: The NPI of the specific surgeon performing the procedure. Adding a new partner to the practice mid-authorization period requires re-authorization for their cases.

Facility: Authorization for Hospital A does not cover Hospital B. If the case moves facilities, re-authorize.

Date range: Most authorizations are time-limited. If the procedure date is rescheduled beyond the auth window, call to extend.

Peer-to-Peer Review

When an orthopedic procedure is denied for medical necessity (especially spine surgery, complex reconstruction, or knee/shoulder scopes), request an immediate peer-to-peer review. Peer-to-peer with the payer's medical reviewer — conducted by your surgeon — reverses 40–60% of orthopedic medical necessity denials. This is one of the highest-ROI activities in orthopedic billing.

How to request: Call the payer's provider relations line within 24–48 hours of the denial. Request a peer-to-peer with the reviewer. Have the surgeon available with the full medical record, conservative treatment history, and imaging findings.

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Workers' Compensation Billing: A Different Framework

Workers' compensation claims follow state-specific fee schedules and require additional documentation that differs substantially from standard health insurance.

Key Workers' Comp Differences

State fee schedules: Each state has its own workers' comp fee schedule (or uses the "usual and customary" standard). California's Official Medical Fee Schedule (OMFS), Texas's Medical Fee Guidelines, and Florida's workers' comp reimbursement schedule each have distinct rules and rates. Billing at the wrong rate is a compliance issue.

Prior authorization: Every elective procedure typically requires written authorization from the claims adjuster or managed care organization assigned to the case. Operating without written authorization risks non-payment. Authorization must be requested in writing and confirmed in writing.

ICD-10 external cause codes: Workers' comp payers require:

• The injury diagnosis (e.g., S52.501A — unspecified fracture of lower end of radius, initial encounter)
• External cause code (e.g., W18.11XA — fall from or off toilet, initial encounter)
• Place of occurrence (e.g., Y93.E9 — activity, other specified)

Missing external cause codes often results in outright rejection.

Claim forms: Workers' comp claims use the CMS-1500 with specific box entries. Box 10a (employment-related injury or illness) must be marked "Yes." The employer's name, insurer, and claims adjuster contact information are required.

Lien Cases (California and Select States)

In states where injured workers can self-refer without a claims adjuster, orthopedic practices sometimes accept lien cases — meaning they are paid from the eventual settlement rather than upfront. Lien billing requires:

• Understanding of state lien law and time-to-file requirements
• Documenting that you have a valid lien
• Managing cash flow implications (payment may be years away)
• In California: complying with the California Labor Code lien requirements and filing within the statutory deadline

Authorization Pitfall: Intraoperative Code Changes

A common workers' comp denial scenario: authorization was obtained for CPT 29881 (arthroscopy, meniscectomy), but the surgeon also repaired the meniscus (29882) or performed ACL reconstruction (29888) based on intraoperative findings. The authorized code doesn't match what was billed.

Fix: When the intraoperative picture is more extensive than planned, contact the payer's authorization line during or immediately after the procedure. Get retroactive authorization in writing. Document the conversation with the payer, including the representative's name, date, and authorization number given.

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Top Orthopedic Denial Reasons and Solutions

1. Missing or Incomplete Medical Necessity Documentation

Problem: MRI, injection, or surgical procedure denied as "not medically necessary."

Fix: Document explicitly:

• Duration of symptoms (weeks/months of pain)
• Conservative treatment tried and failed (physical therapy, NSAIDs, activity modification)
• Functional limitations (difficulty ambulating, ADL impairment)
• Radiographic findings supporting surgical necessity
• Absence of contraindications to the procedure

Payers want to see the failure of conservative care before approving surgery. A templated pre-authorization letter addressing these elements increases approval rates.

2. Authorization Code Mismatch

Problem: Auth obtained for one CPT code; claim submitted for a different (usually more comprehensive or additional) code based on intraoperative findings.

Fix: Always verify auth coverage before submitting the claim. When intraoperative findings expand the case, contact the payer for expanded authorization immediately post-procedure.

3. Global Period Violations

Problem: E/M or procedure billed within the 90-day global window without a modifier.

Fix: Track global period end dates in your PM system. Configure billing alerts when charges are submitted for patients with active global periods. Always review with appropriate modifier when the service is legitimate (-24, -57, -58, -78, -79).

4. Implant Invoice Missing

Problem: Implant HCPCS code denied for lack of supporting documentation.

Fix: Create a workflow requiring the implant invoice to be attached to the charge entry before claim submission. Most PM and billing platforms support electronic claim attachments.

5. Bilateral Modifier Error

Problem: Medicare bilateral procedure billed with LT/RT lines instead of -50; OR commercial bilateral billed with -50 instead of separate LT/RT lines.

Fix: Maintain a payer-specific modifier reference matrix. Train billers to consult it before billing any bilateral procedure claim.

6. Missing Multiple Procedure Modifier -51

Problem: Multiple procedures billed without modifier -51 on secondary procedures, causing incorrect payment calculation or denials.

Fix: Configure your billing system to automatically suggest -51 for secondary procedures on the same claim. Verify add-on code exclusions from -51.

7. Arthroscopic Code Unbundling

Problem: Biller codes 29870 (diagnostic arthroscopy) + 29881 (meniscectomy) for the same knee in the same session. The diagnostic code is bundled into the therapeutic code.

Fix: Create a CPT code pair reference for arthroscopic procedures. The rule: bill the highest-level therapeutic code performed in each joint. Never bill diagnostic + therapeutic for the same joint on the same day.

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Revenue Opportunities Orthopedic Practices Commonly Miss

1. Joint Injection Revenue: CPT 20610, 20611

Joint injections are high-volume, high-margin procedures:

• 20610 (aspiration/injection of major joint, without ultrasound guidance): Reimburses approximately $45–$75 at Medicare rates
• 20611 (aspiration/injection of major joint, with ultrasound guidance): Adds ultrasound guidance value ($30–$50 additional) plus imaging supervision code 76942 ($35)

If your practice performs 20 joint injections per week without ultrasound guidance, adding ultrasound to eligible cases generates approximately $80–$85 additional per case — $80,000–$85,000 per year on 1,000 cases.

2. Remote Therapeutic Monitoring (RTM): CPT 98975, 98977, 98980, 98981

RTM allows billing for remote monitoring of musculoskeletal rehabilitation:

Code	Description	Medicare Rate (approx.)
98975	RTM — initial setup and patient education	~$19 (one-time)
98977	RTM — musculoskeletal system (device supply, 16+ days)	~$55/month
98980	RTM — clinical staff, first 20 min/month	~$51/month
98981	RTM — clinical staff, each additional 20 min	~$41/month

For post-operative total joint patients, shoulder rehab patients, and spine surgery patients using FDA-cleared remote monitoring apps or wearables, RTM is an emerging revenue stream that most practices are not yet billing.

3. Post-Operative Chronic Care Management (CCM): CPT 99490, 99439

Post-operative orthopedic patients — particularly total joint patients with complex medical comorbidities — can qualify for CCM if they have two or more chronic conditions (osteoarthritis + hypertension, diabetes, obesity). CCM generates:

• 99490: ~$63/month for 20 minutes of care coordination
• 99439: ~$47/month for additional 20 minutes

A practice with 100 enrolled CCM patients generates approximately $63,000–$80,000 per year in additional revenue with minimal physician time — coordination is primarily staff-managed.

4. Surgical Navigation Add-On: CPT 61782, 61784, 64999

Computer-assisted navigation for spine surgery (61782 — surgical navigation of intracranial procedure; specific spine navigation add-ons vary) can be separately billable when:

• True computer-assisted navigation (not just fluoroscopy) is used
• Documentation supports the navigation system used and its role
• The payer specifically reimburses navigation add-ons (verify per payer)

5. Intraoperative Neuromonitoring (IONM)

When complex spine surgery is performed with intraoperative neuromonitoring by a separate neurologist or monitoring company, both the monitoring service AND the attending surgeon's role in monitoring interpretation are separately billable. IONM is often outsourced — if your practice has a monitoring arrangement, ensure billing is correctly structured.

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Orthopedic Billing Documentation Requirements

Pre-Operative Documentation

For any elective orthopedic procedure requiring prior authorization:

• History and physical documenting onset, duration, character, and location of symptoms
• Functional limitations and ADL impact
• Conservative treatment tried: physical therapy (with dates and duration), NSAIDs/injections, activity modification
• Objective findings on physical exam (ROM measurements, instability testing, impingement signs)
• Imaging: X-ray results, MRI findings with radiologist report
• Indications for the specific procedure requested

Operative Note Requirements

Every operative note must include:

• Pre-operative and post-operative diagnosis
• Procedure performed (specific techniques used)
• Implants used (manufacturer, model, size, serial number, lot number if applicable)
• Complications (or "none")
• Findings at the time of surgery
• Attending surgeon's name and signature

For arthroscopic cases: systematic joint survey documentation (all compartments examined), specific findings in each compartment, and procedure performed with sufficient detail to support the billed code.

Post-Operative E/M Documentation

When billing a post-op E/M with modifier -24 or -57, the documentation must clearly:

• State the problem being evaluated
• Show it is a distinct, separately identifiable condition from the surgical diagnosis
• Contain the usual E/M elements (subjective, objective, assessment, plan) for the unrelated problem

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Frequently Asked Questions About Orthopedic Billing

Q: What is the 90-day global period and what does it include? The 90-day global period begins the day before surgery and continues 90 days post-operatively. It bundles the surgical procedure, all related pre-operative care, and all routine post-operative care (wound checks, staple removal, related follow-up visits) into a single payment. Services for unrelated conditions or complications requiring separate procedures can be billed separately with the appropriate modifier.

Q: How do we bill bilateral procedures correctly? For Medicare: bill one line with modifier -50. Medicare pays 150% of the single-procedure fee. For most commercial payers: bill two separate lines — one with modifier -LT and one with modifier -RT. Commercial payers often pay 100% + 100%. Always check each payer's bilateral policy, as it varies significantly.

Q: Can we bill implants separately? In non-Medicare outpatient settings, yes — with the implant invoice, operative report, and appropriate HCPCS code. Medicare's APC facility rates include most implant costs in the hospital outpatient setting, though device pass-through payment programs allow separate billing for newly approved devices.

Q: What modifiers are most commonly used in orthopedic billing? The most common: -LT/-RT (bilateral sides), -50 (bilateral for Medicare), -51 (multiple procedures), -57 (decision for major surgery), -58 (staged procedure), -59/-XS (distinct service/structure), -62 (co-surgery), -78 (return to OR for complication), -79 (unrelated procedure in global period), -80 (assistant surgeon).

Q: What is the most common arthroscopy coding error? The most common error is billing a diagnostic arthroscopy (29870) alongside a therapeutic arthroscopy code for the same joint in the same session. The therapeutic code subsumes the diagnostic — you cannot bill both. The second most common error is unbundling chondroplasty (29877) as a separate code when it is included in the meniscectomy code.

Q: How do we handle workers' comp cases in orthopedics? Workers' comp requires state-specific fee schedule compliance, written authorization before every elective procedure, correct ICD-10 external cause codes, and proper claim form documentation including employer and adjuster information. Payment timelines are often longer than commercial insurance, and lien cases add additional complexity. Consider whether your practice has the infrastructure to manage workers' comp accounts receivable effectively.

Q: How do we avoid spine surgery authorization denials? Build a spine-specific prior authorization package that includes: 6+ weeks of conservative treatment failure documentation, physical exam findings with neurological assessment, MRI report with specific pathology identified, and functional limitation documentation. For Medicare Advantage plans, anticipate peer-to-peer review requirements and have the surgeon available. Denials reversed through peer-to-peer after initial denial avoid appeals and expedite scheduling.

Q: What is the correct way to bill multi-level spine surgery? Bill the primary fusion code (e.g., 22612 for one-level PLIF) plus add-on codes for each additional level (22614 per additional level). Add instrumentation codes (22840 series) for the number of instrumented segments. Add interbody device codes (22851 or 22853/22854) if applicable. Add decompression codes if performed. Bone graft codes if separately payable. Each add-on code has no global period ("ZZZ") and is always separately payable at 100%.