| S80.221 | Blister (nonthermal), right knee | NON-BILLABLE CODE |
| S80.221A | Blister (nonthermal), right knee, initial encounter | BILLABLE CODE |
| S80.221D | Blister (nonthermal), right knee, subsequent encounter | BILLABLE CODE |
| S80.221S | Blister (nonthermal), right knee, sequela | BILLABLE CODE |
| S80.222 | Blister (nonthermal), left knee | NON-BILLABLE CODE |
| S80.222A | Blister (nonthermal), left knee, initial encounter | BILLABLE CODE |
| S80.222D | Blister (nonthermal), left knee, subsequent encounter | BILLABLE CODE |
| S80.222S | Blister (nonthermal), left knee, sequela | BILLABLE CODE |
| S80.229 | Blister (nonthermal), unspecified knee | NON-BILLABLE CODE |
| S80.229A | Blister (nonthermal), unspecified knee, initial encounter | BILLABLE CODE |
| S80.229D | Blister (nonthermal), unspecified knee, subsequent encounter | BILLABLE CODE |
| S80.229S | Blister (nonthermal), unspecified knee, sequela | BILLABLE CODE |
