Modifier code
Modifier 91: Repeat clinical diagnostic laboratory test
Repeat of same lab on same day to obtain multiple test results.
Code
91
When to use
When the same lab test is medically necessary to perform more than once on the same day (e.g., repeated glucose for blood glucose monitoring).
Common issues
- Frequency denials if not documented
Frequently asked questions
What is modifier 91?
Repeat clinical diagnostic laboratory test
When should it be used?
When the same lab test is medically necessary to perform more than once on the same day (e.g., repeated glucose for blood glucose monitoring).
Common issues when modifier is missing or wrong?
Frequency denials if not documented.
Other modifiers
- 25 — Significant, separately identifiable E&M service on same day as procedureWhen E&M visit + procedure happen same day and the E&M was separately documented
- 26 — Professional componentSplits a procedure into its professional (physician interpretation) and technica
- 50 — Bilateral procedureProcedure performed on both sides of the body during a single session.
- 51 — Multiple proceduresMultiple procedures performed at the same session.
- 52 — Reduced servicesService partially reduced or eliminated at the physician's discretion.
- 53 — Discontinued procedureProcedure discontinued because of extenuating circumstances.
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