Orthopedic Medical Billing Guide: Global Periods, Modifiers & Fracture Care

Orthopedic billing has a structural complexity most specialties don't deal with: the global surgical package. Get the global period wrong, and every follow-up visit either goes unbilled or gets denied — often without anyone noticing until months of revenue has quietly disappeared.

Orthopedic practices bill a mix of E/M visits, imaging, injections, and surgical procedures — and the surgical side runs on rules that are easy to misapply if a coder isn't specifically trained on them.

The Global Surgical Package

Every surgical CPT code carries a global period: 90 days for major surgery, 10 days for minor procedures, and 0 days for very minor procedures like simple injections. During that window, routine follow-up care related to the surgery is bundled into the original procedure's payment — it can't be billed separately. The most common orthopedic billing mistake is billing a routine post-op visit as a standalone E/M code without the modifier that tells the payer why it's separately billable.

The Modifiers That Make or Break Global Period Billing

Modifier 24 — An E/M visit during the global period for a condition unrelated to the surgery. Without it, the visit is assumed to be routine follow-up and gets bundled or denied.

Modifier 58 — A staged or planned return to the OR (for example, a second-stage procedure planned from the outset). This opens a new global period with full payment for the second procedure.

Modifier 78 — An unplanned return to the OR for a complication of the original surgery, such as infection or bleeding. Payment is limited to the intraoperative portion only.

Modifier 79 — A different, unrelated procedure performed during the global period. This is paid in full and starts its own new global period.

Confusing 78 and 79 is one of the more common orthopedic coding errors — the distinction is whether the second procedure is related to the first, not just whether it happens during the same global window.

Fracture Care Coding

Fracture care CPT codes (for example, the S22.3- rib fracture family or long-bone fracture codes) are typically billed with a 7th character or accompanying modifier indicating the encounter type — initial treatment, subsequent care, or a complication like nonunion. A rib fracture visit billed identically at the first visit and a healing-check visit weeks later is a common documentation gap that causes downstream coding errors.

Common CPT Pairings

Orthopedic visits commonly pair E/M codes with in-office X-rays (a wide range depending on the joint — knee, shoulder, and spine each have their own view-count-specific codes), and injections (CPT 20610 for major joint injection/aspiration) are frequently billed alongside confirmed diagnoses like knee or shoulder osteoarthritis.

Documentation That Protects Orthopedic Revenue

The strongest orthopedic documentation explicitly states where a visit falls relative to any recent surgery (unrelated complaint, planned staged procedure, or complication), since that single detail determines which global-period modifier — if any — applies. Missing that context is the most common reason a legitimate, billable visit gets bundled into a global period payment it was never part of.

Get a free practice audit and we'll check how consistently your orthopedic claims are applying global period modifiers across recent surgical patients.

Frequently Asked Questions

What's the difference between modifier 78 and modifier 79? Modifier 78 is for an unplanned return to the OR for a complication of the original surgery (paid at the intraoperative rate only); modifier 79 is for a genuinely unrelated procedure during the same global period (paid in full).

Does every orthopedic visit during a global period need a modifier? No — only visits or procedures that are separately billable despite falling inside the global window. Routine, related follow-up care doesn't need a modifier because it isn't separately billed at all.

How long is the global period for a major joint replacement? Major orthopedic surgeries typically carry a 90-day global period, while minor procedures carry 10 days or zero days depending on complexity.

What happens if a global period modifier is left off a valid claim? The visit is typically bundled into the original surgery's payment or denied outright, since the payer's system has no way to know it was separately billable without the modifier.

Are imaging codes affected by the global surgical package? Generally no — diagnostic imaging is usually billable separately from the global surgical package, though documentation should still support its medical necessity independent of the surgery itself.