AMA CPT® Assistant - 1999 Issue 7 (July)

Modifier -51 vs. -59 (July 1999)

July 1999 pages 1-2 Modifier -51 vs. -59 Since the implementation of the -59 modifier in the 1997 edition of CPT, many questions have been raised regarding the appropriate use of this modifier vs. modifier -51. Modifier -59, Distinct Procedural Service Modifier -59 was added to clearly designate instances when distinct and separate multiple services are provided to a patient on a single date of service. This modifier is the CPT Level I counterpart of the previous HCPCS Level II -GB modifier. As the description of this modifier indicates, some examples of common uses of the -59 modifier include...

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