Modifier 78: Return to the OR During a Global Period
Modifier 78 bills an unplanned return to the OR for a related problem in a global period. What Medicare pays, what counts as an OR, and when to use 58 or 79.
Modifier 78 is a billing modifier for an unplanned return to the operating room, by the same surgeon or group, for a procedure related to the first surgery during its postoperative period, most often to treat a complication. Medicare pays only the intraoperative portion of the new procedure's fee, and the original global period keeps running.
Key takeaways
- 78 requires a return to an operating room: an OR, cath lab, laser suite or endoscopy suite. Bedside or office treatment of a complication is part of the global package.
- Bill the code for what was done on the return trip, not the original surgery's code, unless the identical procedure was repeated.
- Medicare pays the intraoperative percentage of that code. Codes with a 000 global are paid in full.
- No new global period starts. The first surgery's window keeps running.
- Planned or staged procedures use 58; unrelated ones use 79.
Modifier 78 · payment effect
With and without the modifier
10180 without 78 · national office
$288.25
Wound drainage
10180-78 · Intraoperative only: 80%
$230.60
A return to the OR for a complication pays only the intraoperative portion, and no new global period starts.
What modifier 78 means
The global surgery package covers complications the surgeon treats without going back to the operating room. A return trip is different: CMS excludes "treatment for postoperative complications which requires a return trip to the operating room" from the package (Pub. 100-04, ch. 12, §40.1.B). Modifier 78 bills that return trip.
CMS defines an operating room for this purpose as a place "specifically equipped and staffed for the sole purpose of performing procedures," including a cardiac catheterization suite, a laser suite and an endoscopy suite. A patient's room, a minor treatment room, a recovery room or an ICU doesn't count, unless the patient was too unstable to move.
Global surgery period · 27447
Total knee replacement
90-day global period ends
May 31, 2026
Covers Mar 1, 2026 through May 31, 2026 (92 days, including the day before surgery).
Visit on Apr 1, 2026
Day 30 of the 90-day post-op period: related follow-up care is included in the surgical payment.
Pre-op dayGlobal period
When to use modifier 78
- Complications that need the OR. Three weeks after a total knee replacement (27447), the surgeon takes the patient back to the OR to drain an infected wound (10180). Bill 10180-78.
- A related procedure that requires the OR, even if it isn't a complication. CMS notes the modifier definition doesn't limit 78 to complications.
- The same procedure repeated because of a complication. This is the one case where the original code is billed again, with 78.
- No code for what was done? Use the unlisted code in the right series (for example 47999 or 64999). Medicare pays up to 50% of the intraoperative value of the original surgery for it.
Check the window with the global period calculator. After the global period ends, no modifier is needed.
When not to use modifier 78
Also skip 78:
- For a planned, staged or more extensive procedure. That's modifier 58, which starts a new global period.
- For an unrelated procedure. That's modifier 79, which also starts a new global period.
- For a visit. Unrelated visits take 24; related visits aren't billable.
- After the global period has ended. Medicare treats 78 billed after expiry as a multiple surgery.
How modifier 78 affects payment
Medicare pays the intraoperative portion of the code that describes the return-trip procedure: the fee schedule amount times the code's intraoperative percentage from the fee schedule file, rounded to the cent (Pub. 100-04, ch. 12, §40.4.C). The pre- and postoperative shares aren't paid, because the original surgery's global fee already covers that care.
- Codes with a 000 global have no pre-, intra- or postoperative split, so they're paid in full with 78.
- Several procedures on one return trip are each paid under the complication rule. CMS says the multiple surgery reduction doesn't also apply; the same goes for bilateral procedures on the return trip.
- Unlisted procedure for the complication: at most 50% of the intraoperative value of the original surgery.
The original global period continues and isn't reset (Novitas, Modifier 78 fact sheet).
CMS payment indicators · 10180
Wound drainage
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 010 | Minor procedure: the day of the procedure plus 10 days after are included. |
| Multiple procedures | 2 | Standard reduction: highest-valued procedure at 100%, others at 50%. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 1 | Not paid (statutory restriction). |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
| Split (54/55/56) | 0.10/0.80/0.10 | Share of the payment for pre-op, the procedure itself, and post-op care. |
Modifier 78 vs 58 and 79
FAQ
What is modifier 78 used for?
To bill an unplanned return to the operating room during a procedure's postoperative period, by the same surgeon or group, for a related procedure such as treating a complication.
Does modifier 78 start a new global period?
No. The original procedure's global period keeps running. Modifiers 58 and 79 start new ones.
How much does Medicare pay for modifier 78?
The intraoperative percentage of the fee schedule amount for the procedure performed on the return trip. Codes with a 000 global period are paid in full.
What is the difference between modifier 58 and 78?
58 is for a procedure planned at the time of the first surgery, more extensive than the first, or therapy after a diagnostic surgery. 78 is for an unplanned return to the OR for a related problem. 58 pays the full amount and starts a new global period; 78 pays the intraoperative portion and doesn't.
What counts as an operating room for modifier 78?
A room equipped and staffed only for procedures, including cath labs, laser suites and endoscopy suites. Patient rooms, minor treatment rooms, recovery rooms and ICUs don't count unless the patient couldn't safely be moved.
Keep reading
- Global period calculator to check the original surgery's window.
- Modifier 79 and modifier 58 for other procedures in the global period.
- Modifier 24 for unrelated visits.
- Codes on this page: 10180 27447 10140
Sources: Medicare Claims Processing Manual, Pub. 100-04, ch. 12, §40.1.B, §40.2.A.5, §40.4.C and §40.6.C; Novitas Solutions, Modifier 78 fact sheet. Verified October 6, 2026.
