| T24.621 | Corrosion of second degree of right knee | NON-BILLABLE CODE |
| T24.621A | Corrosion of second degree of right knee, initial encounter | BILLABLE CODE |
| T24.621D | Corrosion of second degree of right knee, subsequent encounter | BILLABLE CODE |
| T24.621S | Corrosion of second degree of right knee, sequela | BILLABLE CODE |
| T24.622 | Corrosion of second degree of left knee | NON-BILLABLE CODE |
| T24.622A | Corrosion of second degree of left knee, initial encounter | BILLABLE CODE |
| T24.622D | Corrosion of second degree of left knee, subsequent encounter | BILLABLE CODE |
| T24.622S | Corrosion of second degree of left knee, sequela | BILLABLE CODE |
| T24.629 | Corrosion of second degree of unspecified knee | NON-BILLABLE CODE |
| T24.629A | Corrosion of second degree of unspecified knee, initial encounter | BILLABLE CODE |
| T24.629D | Corrosion of second degree of unspecified knee, subsequent encounter | BILLABLE CODE |
| T24.629S | Corrosion of second degree of unspecified knee, sequela | BILLABLE CODE |
