Orthopedic Billing and Coding: Complete Guide

Orthopedic billing is defined by surgical complexity. Between global surgery periods, fracture care bundling, multiple procedure discounts, and the sheer volume of CPT codes covering every bone, joint, and soft tissue in the body, orthopedic practices face billing challenges that general billers are not equipped to handle.

The financial impact of orthopedic coding errors is substantial. A single total knee replacement billed with the wrong modifier can result in a $2,000-$4,000 reimbursement shortfall. Multiply that across a busy surgical practice and the annual revenue loss easily reaches six figures. This guide covers the coding rules, common mistakes, and billing strategies that every orthopedic practice needs to know.

Global Surgery Periods: The Foundation of Orthopedic Billing

The global surgery package is the single most important concept in orthopedic billing. When an orthopedic surgeon performs a procedure, the payment includes not just the surgery itself but also pre-operative and post-operative care within defined timeframes.

90-Day Global Period

Major orthopedic procedures — total joint replacements (CPT 27447 for total knee, 27130 for total hip), rotator cuff repairs (23412), ACL reconstruction (29888), and spinal fusions (22612) — carry a 90-day global period. This means the surgical fee includes one day of pre-operative care, the surgery, and 90 days of routine post-operative follow-up. Routine follow-up visits, cast changes, suture removal, imaging review, and physical therapy prescriptions during this window cannot be billed separately.

10-Day and 0-Day Global Periods

Minor procedures have shorter global periods. Trigger finger release (26055) carries a 10-day global period. Joint injections (20610-20611) and closed fracture care without manipulation typically have a 0-day global period, meaning only the procedure-day post-op care is included. Knowing the global period for every code your surgeons perform is essential — billing a follow-up visit during the global period without a valid modifier is a compliance violation and a frequent audit trigger.

Billing During the Global Period

There are legitimate scenarios where services during the global period are separately billable. Modifier -24 (unrelated E/M during the postoperative period) applies when the patient is seen for a condition unrelated to the surgery — for example, a patient 30 days post-knee replacement who presents with a new shoulder injury. Modifier -78 (return to the operating room for a related complication) covers situations like a post-surgical infection requiring irrigation and debridement. Modifier -79 (unrelated procedure during the postoperative period) applies when a different surgery is performed during the global period of the first.

Fracture Care Coding

Fracture care coding is one of the most error-prone areas in orthopedic billing. The code selection depends on three factors: the anatomic location, the type of treatment (closed vs. open, with or without manipulation), and whether the physician provides the initial treatment or only follow-up care.

Closed Treatment Codes

Closed fracture treatment ranges from simple immobilization to closed reduction with manipulation. For a distal radius fracture, the code options are: 25600 (closed treatment without manipulation), 25605 (closed treatment with manipulation), and 25606 (percutaneous skeletal fixation). Each code carries a different global period and reimbursement rate. Selecting 25600 when the physician actually performed manipulation and casting under sedation (25605) significantly undervalues the service — a common undercoding error that costs $400-$800 per case.

Open Treatment Codes

Open reduction and internal fixation (ORIF) codes apply when surgical incision and hardware placement are required. For the same distal radius fracture, CPT 25607 (open treatment) or 25608 (open treatment of intra-articular fracture) applies. These codes reimburse 2-3x higher than closed treatment codes. Documentation must clearly support the approach — operative reports should specify open incision, fracture visualization, reduction, and fixation method.

Arthroscopy Billing

Arthroscopic procedures present unique bundling challenges. Multiple procedures performed through the same arthroscopic portal during a single session have specific billing rules.

Knee Arthroscopy

Knee arthroscopy with meniscectomy (29881) is one of the most commonly performed orthopedic procedures. When both medial and lateral meniscectomy are performed, 29881 is billed once with modifier -59 for the second compartment — not twice with the same code. When arthroscopic meniscectomy is performed with chondroplasty (29877) in the same compartment, the chondroplasty is typically bundled. However, chondroplasty in a different compartment is separately billable with modifier -59 or XS.

Shoulder Arthroscopy

Shoulder arthroscopy codes include diagnostic arthroscopy (29805), subacromial decompression (29826), distal clavicle excision (29824), rotator cuff repair (29827), and labral repair (29806). When multiple procedures are performed, the highest-value code is listed first, and secondary procedures receive modifier -51 (multiple procedures) or -59 as appropriate. Note that diagnostic arthroscopy (29805) is bundled into any surgical arthroscopy performed in the same session — billing both is a common error.

Spine Surgery Coding

Spine surgery billing involves multi-level coding, anterior and posterior approach distinctions, and instrumentation add-on codes that are frequently missed.

Fusion Coding

A posterior lumbar interbody fusion (PLIF) at L4-L5 involves multiple billable components: 22630 (posterior interbody fusion, single level), 22842 (posterior segmental instrumentation, 3-6 vertebral segments), and 20930 or 20931 (allograft or autograft for spine surgery). Each additional fusion level adds 22632 (add-on code). Missing the instrumentation code or the bone graft code leaves $1,500-$3,000 per case uncollected.

Decompression with Fusion

When a laminectomy (63047) is performed at the same level as a fusion, the billing rules vary by payer. CMS bundles the decompression into the fusion at the same level for posterior approach procedures. However, decompression at a different level from the fusion is separately billable. Commercial payers have inconsistent policies — some follow CMS rules, others allow separate billing with modifier -59. Knowing each payer's specific policy is critical.

Modifier Mastery for Orthopedics

Correct modifier usage in orthopedic billing directly impacts reimbursement. The modifiers that matter most:

• Modifier -59 (Distinct Procedural Service): Used when two procedures that are normally bundled are performed in distinct anatomic sites or during distinct patient encounters. Overuse triggers audits; underuse leaves revenue uncollected.
• Modifier -RT/-LT (Right/Left): Required for bilateral procedures. Billing bilateral knee injections (20611) without -RT and -LT modifiers results in duplicate claim denials.
• Modifier -76 (Repeat Procedure, Same Physician): Used when the same procedure is performed again on the same day — such as a second joint injection in a different joint.
• Modifier -22 (Increased Procedural Services): Applied when the work required substantially exceeds the typical service. Requires detailed documentation explaining why. Increases reimbursement by 20-30% when supported.
• Modifier -62 (Two Surgeons): Used when two surgeons of different specialties perform distinct portions of a procedure — common in complex spine cases with an orthopedic surgeon and a neurosurgeon.

Five Revenue Recovery Strategies

1. Audit global period compliance quarterly. Review claims submitted during active global periods. Verify that every claim has an appropriate modifier and that routine post-op visits are not being billed. Both overbilling and underbilling create risk.
2. Track fracture care from ED to final follow-up. Ensure the initial fracture care code matches the treatment actually provided, and that subsequent care is properly attributed to the original global period or billed with modifier -55 when a different provider takes over.
3. Capture all surgical components. Create procedure-specific code checklists for common surgeries. A total knee replacement should always include the arthroplasty code, hardware, bone cement (if used), and any separately billable ancillary procedures.
4. Verify prior authorization for every elective surgery. Prior authorization denials account for 15-20% of orthopedic claim denials. A dedicated prior auth workflow that verifies approval before the patient enters the OR eliminates this entirely.
5. Use modifier -22 appropriately. Complex revision surgeries, morbidly obese patients requiring additional operative time, and unexpected intraoperative findings all qualify for modifier -22. Include an operative report addendum detailing the additional work. Many practices never use -22, leaving 20-30% reimbursement increases unclaimed.

The Bottom Line

Orthopedic billing requires a level of coding precision that general billers cannot deliver. Global surgery periods, fracture care hierarchies, arthroscopy bundling rules, and spine surgery component billing all demand specialty-specific expertise. The practices that get this right collect $150,000-$300,000 more per surgeon per year than those that do not.

Related: Orthopedic Billing Services · Medical Coding Services · Why Coding Accuracy Matters