CPT® 91, Under Provider Services and Ambulatory Service Center Modifiers

The Current Procedural Terminology (CPT®) code 91 as maintained by American Medical Association, is a medical procedural code under the range - Provider Services and Ambulatory Service Center Modifiers.

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Lay Term

Summary

Append modifier 91 to a repeat lab test on the same day for the same patient.

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Modifier Guidelines

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