Radiology and Pathology Modifiers

TC Technical component
26 Professional component
GG Performance and payment of a screening mammogram and diagnostic mammogram on the same patient, same day.

PI Positron Emission Tomography or Computed Tomography to inform the initial treatment strategy of tumors that are biopsy proven or strongly suspected of being cancerous based on other diagnostic testing.

PS Positron Emission Tomography or Computed Tomography to inform the subsequent treatment strategy of cancerous tumors when the beneficiary's treatment physician determines that the PET study is needed to inform subsequent anti-tumor strategy.