Modifiers · CPT modifier

Repeat procedure another physician

Modifier 77 tells a payer that a second, different provider repeated the exact same procedure on the same patient on the same calendar date. It signals that the repeat service was medically necessary and not a billing duplicate. Append it to the second provider's claim line—never to the first—so the payer can distinguish the two encounters and reimburse both appropriately.

Verified May 8, 2026 · 8 sources ↓

Type: CPT
CPT codes use it: 723
Top regions: Other, Foot & ankle, Spine

Drawn from NovitasCMSBcbsndAAOSFindacode

When to use modifier 77

Source · Editorial brief grounded in 8 cited references ↓

Use modifier 77 when two distinct providers each independently perform the identical procedure code on the same patient on the same date of service. The clearest example in radiology is a dual-read scenario: an emergency physician interprets a chest X-ray (71045-26) at the point of care, and a radiologist later performs a separate interpretation that changes or clarifies the diagnosis. The radiologist appends modifier 77 to their 71045-26 claim line. Medicare will only pay for the second read under unusual circumstances—such as a questionable finding that prompted the first reader to request specialist review, or a materially different diagnostic conclusion that directly changed patient management.

In orthopedics, modifier 77 surfaces during the global surgical period. If a patient undergoes an ORIF of the distal radius and develops hardware failure or recurrent instability requiring the identical procedure (e.g., repeat ORIF) before the global period closes, and a different surgeon performs that revision, modifier 77 is the correct signal. The same logic applies to spine surgery: if a patient's lumbar disc herniation recurs within 90 days and a covering surgeon—not the original operator—performs a repeat single-level lumbar discectomy (CPT 63030), modifier 77 distinguishes that claim from a duplicate of the first procedure.

Always pair modifier 77 with supporting documentation that explains why the repeat service was medically necessary and why a different provider performed it. Payers—including Medicare and most commercial plans—require the medical record to reflect the distinct clinical circumstance that justified a second intervention. Without that documentation, the claim is indistinguishable from an erroneous duplicate submission.

Orthopedic scenarios

Concrete situations in orthopedic practice that warrant modifier 77.

Source · Editorial brief grounded in AAOS coding guidance and cited references ↓

A patient sustains a femoral shaft fracture. A trauma surgeon performs intramedullary nailing (CPT 27506) in the morning. Intraoperative fluoroscopy reveals malalignment; a second fellowship-trained orthopedic traumatologist is called in and independently performs a revision nailing the same day under separate anesthesia. The second surgeon bills 27506-77.
During a knee arthroscopy (CPT 29881—medial meniscectomy), the operating surgeon encounters an unexpected lateral meniscus tear requiring lateral meniscectomy as well. A covering partner completes the lateral side independently later that day due to an emergency timeout; the partner bills 29881-77 for the lateral meniscectomy encounter.
A patient with recurrent anterior shoulder instability has a Bankart repair (CPT 29806) performed by one orthopedic surgeon. Within the global period, the repair fails acutely and a different surgeon at the same institution performs a repeat arthroscopic Bankart repair (CPT 29806-77).
Post-operative fluoroscopic check of a distal radius ORIF (CPT 25600 series) is interpreted by the operating orthopedic surgeon. The hospital radiologist subsequently performs a formal interpretation of the same intraoperative fluoroscopic series and documents a previously unrecognized intra-articular screw penetration; the radiologist bills the relevant imaging code with modifier 77.
A patient undergoes a single-level anterior cervical discectomy and fusion (CPT 22551) by Surgeon A. The patient is re-admitted the same evening with acute neurological deterioration. Surgeon B, the on-call spine surgeon, returns the patient to the OR and performs a repeat decompression at the same level (CPT 22551-77).

Common mistakes

Where coders most often go wrong with modifier 77.

Source · Editorial brief grounded in CMS NCCI Policy Manual and cited references ↓

Appending modifier 77 to an E/M code (e.g., 99285)—modifier 77 is reserved for procedures and diagnostic services, not evaluation and management encounters.
Using modifier 77 when the same provider repeats the procedure—that scenario requires modifier 76, not 77; conflating the two triggers denials or incorrect attribution.
Appending modifier 77 to the first provider's claim line instead of the second provider's line—the modifier belongs on the repeat service, not the original.
Relying on modifier 77 to bypass NCCI Procedure-to-Procedure (PTP) bundling edits—CMS explicitly excludes modifier 77 from the list of NCCI PTP-associated modifiers, so it will not override a bundling edit.
Billing a repeat ORIF or arthroscopic procedure with modifier 77 when the second surgery is actually performed by the same surgeon under a locum arrangement without verifying that a true different NPI is being billed.
Failing to include a narrative or clinical rationale on the claim when submitting a second imaging interpretation under modifier 77, causing automatic denial under Medicare's 'unusual circumstances' threshold.
Appending modifier 77 to services with a Medically Unlikely Edit (MUE) adjudication indicator of 2—those are absolute date-of-service edits that cannot be overridden by modifier 77.

CPT codes that use modifier 77

723 orthopedic CPT codes in our reference list this modifier as applicable. Sorted by total RVU.

Source · Derived from per-code modifier guidance in our CPT reference

Showing top 12 of 723 by total RVU.

Where modifier 77 shows up

Body regions where this modifier most commonly appears in our orthopedic reference.

Other 111 codes
Foot & ankle 106 codes
Spine 80 codes
Hand 74 codes

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 8 cited references ↓

01What is the difference between modifier 76 and modifier 77?

Modifier 76 indicates the same provider repeated the procedure; modifier 77 indicates a different provider repeated it. Submitting 76 when a different surgeon actually performed the repeat service—or vice versa—misrepresents the claim and can trigger an audit or denial. Always verify which NPI performed the second service before selecting the modifier.

02Can modifier 77 override an NCCI bundling edit?

No. CMS explicitly excludes modifier 77 from the list of NCCI PTP-associated modifiers, meaning it cannot be used to bypass a Procedure-to-Procedure bundling edit. If the code pair is bundled under NCCI, modifier 77 will not unlock separate payment; you must evaluate whether modifier 59 or an X-modifier is appropriate under the correct clinical circumstances instead.

03Which provider appends modifier 77 to the claim—the first or the second?

The second provider appends modifier 77 to their claim line. The first provider bills the procedure without any repeat modifier. Attaching modifier 77 to the original service is a coding error that can cause both claims to be flagged as duplicates.

04Does Medicare always pay for a second imaging interpretation billed with modifier 77?

No. Medicare reimburses a second interpretation only under unusual circumstances—either the initial reader identified a questionable finding and sought specialist review, or the second read produced a diagnosis that materially changed patient management. The narrative or remarks field of the claim should document which circumstance applies.

05Is modifier 77 appropriate during a global surgical period in orthopedics?

Yes, modifier 77 is specifically designed for the global period scenario where a different surgeon performs the identical procedure before the global clock resets. For example, if a covering spine surgeon performs a repeat single-level lumbar discectomy (CPT 63030) within 90 days of the original surgery by a different surgeon, modifier 77 signals to the payer that this is a legitimate repeat by a new provider, not a duplicate claim.

06Can modifier 77 be appended to evaluation and management (E/M) codes?

No. Modifier 77 is not valid on E/M codes. Applying it to codes such as 99213 or 99285 is an inappropriate use and will result in denial. If two providers each conduct an E/M service on the same patient on the same date, payer rules for E/M reporting—not modifier 77—govern whether both can be reimbursed.

07What documentation must support a modifier 77 claim?

The medical record must clearly establish that a second, distinct provider performed the identical procedure, that a separate medical necessity justified the repeat service, and that the two encounters were clinically distinct. For imaging, document the clinical question that drove the second read and the resulting change in diagnosis or management. For surgical repeats within the global period, the operative note must explain the acute indication for returning to the OR.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

01
novitas-solutions.com
https://www.novitas-solutions.com/webcenter/portal/MedicareJL/pagebyid?contentId=00092116
02
cms.gov
https://www.cms.gov/files/document/2025nccimedicarepolicymanualcompletepdf.pdf
03
bcbsnd.com
https://www.bcbsnd.com/providers/policies-precertification/reimbursement-policy/modifiers-76-77-and-91-repeat-and-duplicate-services
04
aaos.org
https://www.aaos.org/globalassets/quality-and-practice-resources/coding-and-reimbursement/resident-guide/resident-guide_modifiers.pdf
05
findacode.com
https://www.findacode.com/articles/reporting-modifiers-76-77-confidence-37363.html
06AMA CPT Professional Edition — Appendix A (Modifiers), Modifier 77 descriptor and guidelines
07CMS IOM Pub. 100-04 Medicare Claims Processing Manual, Chapter 4, Section 20.6.5
08CMS IOM Pub. 100-04 Medicare Claims Processing Manual, Chapter 13, Section 100.1

Mira AI Scribe

Modifier 77 flags a procedure repeated by a different provider on the same date. In orthopedics, it most often applies within a global surgical period when a covering or consulting surgeon performs the identical CPT code that the primary surgeon already completed—think repeat ORIF, revision arthroscopy, or re-exploration after spinal decompression. It also appears in diagnostic imaging when two physicians each generate an independent interpretation report for the same study and the second read materially changes the clinical picture. Key documentation requirements: the chart must establish (1) the original procedure and provider, (2) the distinct medical necessity driving the repeat, and (3) the identity of the second provider. Modifier 77 does not override NCCI bundling edits and cannot be appended to E/M codes. Always confirm individual payer policy before submitting, as Medicare limits reimbursement of repeat imaging interpretations to unusual circumstances only.

See how Mira flags modifier 77 in dictation