The letters at the beginning of HCPCS Level II codes have the following meanings:
There are three important HCPCS Level 2 codes for digital mammograms that often used (G0202, G0204 and G0206). The original mammogram codes (film based mammograms) are CPT codes (77055, 77056, and 77057), so it would be easy to overlook the increasingly used digital mammogram codes that remain as HCPCS Level 2 codes if one did not know they existed (and possibly under-report mammogram statistics).