Clarifying selected CPT modifiers.

Abstract

This discussion includes only 20 percent of the modifiers available for physician reporting, but could account for 80 percent of modifiers assigned for physician services. Modifier -91 was the only new modifier introduced in CPT 2000 and it is used to report a repeat clinical diagnostic laboratory test. It is not to be used when confirming initial results or for any other reason other than a clinical need to repeat the test for the same patient on the same day. Success with CPT modifier reporting requires a thorough review of CPT guidelines and some detective work for identifying health plan requirements for modified codes.