Laboratory Services Policy, Professional
2022-2-10 · For additional information, refer to the Questions and Answers section, Q&A #2, and #4. According to the AMA and CMS, it is inappropriate to use modifier 76 or 77 to indicate repeat laboratory services. Modifiers 59, XE, XP, XS, XU, or 91 should be used to indicate repeat or distinct laboratory services when reported by