| T21.50 | Corrosion of first degree of trunk, unspecified site | NON-BILLABLE CODE |
| T21.50XA | Corrosion of first degree of trunk, unspecified site, initial encounter | BILLABLE CODE |
| T21.50XD | Corrosion of first degree of trunk, unspecified site, subsequent encounter | BILLABLE CODE |
| T21.50XS | Corrosion of first degree of trunk, unspecified site, sequela | BILLABLE CODE |
| T21.51 | Corrosion of first degree of chest wall | NON-BILLABLE CODE |
| T21.51XA | Corrosion of first degree of chest wall, initial encounter | BILLABLE CODE |
| T21.51XD | Corrosion of first degree of chest wall, subsequent encounter | BILLABLE CODE |
| T21.51XS | Corrosion of first degree of chest wall, sequela | BILLABLE CODE |
| T21.52 | Corrosion of first degree of abdominal wall | NON-BILLABLE CODE |
| T21.52XA | Corrosion of first degree of abdominal wall, initial encounter | BILLABLE CODE |
| T21.52XD | Corrosion of first degree of abdominal wall, subsequent encounter | BILLABLE CODE |
| T21.52XS | Corrosion of first degree of abdominal wall, sequela | BILLABLE CODE |
| T21.53 | Corrosion of first degree of upper back | NON-BILLABLE CODE |
| T21.53XA | Corrosion of first degree of upper back, initial encounter | BILLABLE CODE |
| T21.53XD | Corrosion of first degree of upper back, subsequent encounter | BILLABLE CODE |
| T21.53XS | Corrosion of first degree of upper back, sequela | BILLABLE CODE |
| T21.54 | Corrosion of first degree of lower back | NON-BILLABLE CODE |
| T21.54XA | Corrosion of first degree of lower back, initial encounter | BILLABLE CODE |
| T21.54XD | Corrosion of first degree of lower back, subsequent encounter | BILLABLE CODE |
| T21.54XS | Corrosion of first degree of lower back, sequela | BILLABLE CODE |
| T21.55 | Corrosion of first degree of buttock | NON-BILLABLE CODE |
| T21.55XA | Corrosion of first degree of buttock, initial encounter | BILLABLE CODE |
| T21.55XD | Corrosion of first degree of buttock, subsequent encounter | BILLABLE CODE |
| T21.55XS | Corrosion of first degree of buttock, sequela | BILLABLE CODE |
| T21.56 | Corrosion of first degree of male genital region | NON-BILLABLE CODE |
| T21.56XA | Corrosion of first degree of male genital region, initial encounter | BILLABLE CODE |
| T21.56XD | Corrosion of first degree of male genital region, subsequent encounter | BILLABLE CODE |
| T21.56XS | Corrosion of first degree of male genital region, sequela | BILLABLE CODE |
| T21.57 | Corrosion of first degree of female genital region | NON-BILLABLE CODE |
| T21.57XA | Corrosion of first degree of female genital region, initial encounter | BILLABLE CODE |
| T21.57XD | Corrosion of first degree of female genital region, subsequent encounter | BILLABLE CODE |
| T21.57XS | Corrosion of first degree of female genital region, sequela | BILLABLE CODE |
| T21.59 | Corrosion of first degree of other site of trunk | NON-BILLABLE CODE |
| T21.59XA | Corrosion of first degree of other site of trunk, initial encounter | BILLABLE CODE |
| T21.59XD | Corrosion of first degree of other site of trunk, subsequent encounter | BILLABLE CODE |
| T21.59XS | Corrosion of first degree of other site of trunk, sequela | BILLABLE CODE |
