Historically, CMS has used HCPCS codes to report mammography services. Due to technical issues, they are unable to adopt the CPT codes in 2017 but have changed the descriptions of the G codes to match.
| Mammography | 2016 Code | 2017 CPT | 2017 Medicare |
| Diagnostic, unilateral | 77055 | 77065 | G0206 |
| Diagnostic, bilateral | 77056 | 77066 | G0204 |
| Screening, bilateral | 77057 | 77067 | G0202 |
Bottom-line, you do not need an exception letter to switch from the CPT to the HCPCS or vice versa. They mean the exact same thing. We’ll get you an edit.
Codes 77051, 77052, and 77055–77057 have been deleted.