The Global Surgical Period: Modifiers 24, 25, 57, 58, 78, and 79
Every surgical code carries a global period — a window (often 90 days for major procedures) during which routine post-operative care is bundled into the original payment. The trouble starts when something happens in that window that isn't routine. The right modifier is the difference between getting paid and getting denied.
The key global-period modifiers
- -24 — an unrelated E/M visit during the global period (a different problem, not post-op care).
- -25 — a significant, separately identifiable E/M on the same day as a procedure.
- -57 — the E/M visit at which the decision for major surgery was made.
- -58 — a staged or planned related procedure during the global period (anticipated from the start).
- -78 — an unplanned return to the OR for a related complication.
- -79 — an unrelated procedure during the global period.
The distinctions that get missed
-58 vs. -78 trips up many surgeons: -58 is for planned/staged or more extensive work that was anticipated; -78 is for an unplanned return for a complication. Choosing the wrong one invites denials or audits. Similarly, -24 and -79 both signal “unrelated,” so the note must establish that the service truly addressed a different problem.
Documentation is the proof
Each of these modifiers makes a claim about the relationship between services — planned vs. unplanned, related vs. unrelated. The note has to support that relationship explicitly. “Patient returned to OR” without context can't tell -58 from -78.
Clinical Capture recognizes return-to-OR and staged-procedure scenarios in the note and flags the appropriate global-period modifier, along with what to document to support it.
This article is educational and not coding, billing, or legal advice. Always verify codes and values against the current CPT®, ICD-10-CM, and CMS Physician Fee Schedule, follow NCCI edits and payer policy, and confirm with a certified coder before submitting a claim. Document only work that was actually performed.