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Modifier 77

Modifier 77 Description and Billing Use

Plain-language description

Reports a medically necessary repeat service by a different physician or qualified professional when supported.

How modifier 77 is used

Modifier 77 identifies a medically necessary repeat procedure or service performed by another physician or qualified professional. Modifier 76 applies when the same professional repeats the service.

Compare modifier 76 before billing a repeat service.

Before reporting this modifier

  1. 1. Confirm the current official or licensed definition and payer acceptance.
  2. 2. Identify the exact claim circumstance the modifier communicates.
  3. 3. Make the code, setting, related services, and medical record consistent.
  4. 4. Check NCCI, global surgery, component, DME, ABN, or drug rules that apply.
  5. 5. Do not append a modifier only to force an edit override.
LessonStudy the related billing ruleOfficial sourceReview current CMS guidance

This is a workflow summary, not a licensed CPT definition or claim-specific coding instruction. Verify the code set and payer rule effective for the date of service.