| S21.001 | Unspecified open wound of right breast | NON-BILLABLE CODE |
| S21.001A | Unspecified open wound of right breast, initial encounter | BILLABLE CODE |
| S21.001D | Unspecified open wound of right breast, subsequent encounter | BILLABLE CODE |
| S21.001S | Unspecified open wound of right breast, sequela | BILLABLE CODE |
| S21.002 | Unspecified open wound of left breast | NON-BILLABLE CODE |
| S21.002A | Unspecified open wound of left breast, initial encounter | BILLABLE CODE |
| S21.002D | Unspecified open wound of left breast, subsequent encounter | BILLABLE CODE |
| S21.002S | Unspecified open wound of left breast, sequela | BILLABLE CODE |
| S21.009 | Unspecified open wound of unspecified breast | NON-BILLABLE CODE |
| S21.009A | Unspecified open wound of unspecified breast, initial encounter | BILLABLE CODE |
| S21.009D | Unspecified open wound of unspecified breast, subsequent encounter | BILLABLE CODE |
| S21.009S | Unspecified open wound of unspecified breast, sequela | BILLABLE CODE |
