| F1 | Left hand, second digit |
| F2 | Left hand, third digit |
| F3 | Left hand, fourth digit |
| F4 | Left hand, fifth digit |
| F5 | Right hand, thumb |
| F6 | Right hand, second digit |
| F7 | Right hand, third digit |
| F8 | Right hand, fourth digit |
| F9 | Right hand, fifth digit |
| FA | Left hand, thumb |
| FB | Item provided without cost to provider, supplier or practitioner, or full credit received for replaced device (examples, but not limited to, covered under warranty, replaced due to defect, free samples) |
| FC | Partial credit received for replaced device |
| FP | Service provided as part of family planning program |
| FQ | The service was furnished using audio-only communication technology |
| FR | The supervising practitioner was present through two-way, audio/video communication technology |
| FS | Split (or shared) evaluation and management visit |
| FT | Unrelated evaluation and management (e/m) visit on the same day as another e/m visit or during a global procedure (preoperative, postoperative period, or on the same day as the procedure, as applicable). (report when an e/m visit is furnished within the global period but is unrelated, or when one or more additional e/m visits furnished on the same day are unrelated) |
| FX | X-ray taken using film |
| FY | X-ray taken using computed radiography technology/cassette-based imaging |