| T20.50 | Corrosion of first degree of head, face, and neck, unspecified site | NON-BILLABLE CODE |
| T20.50XA | Corrosion of first degree of head, face, and neck, unspecified site, initial encounter | BILLABLE CODE |
| T20.50XD | Corrosion of first degree of head, face, and neck, unspecified site, subsequent encounter | BILLABLE CODE |
| T20.50XS | Corrosion of first degree of head, face, and neck, unspecified site, sequela | BILLABLE CODE |
| T20.51 | Corrosion of first degree of ear [any part, except ear drum] | NON-BILLABLE CODE |
| T20.511 | Corrosion of first degree of right ear [any part, except ear drum] | NON-BILLABLE CODE |
| T20.511A | Corrosion of first degree of right ear [any part, except ear drum], initial encounter | BILLABLE CODE |
| T20.511D | Corrosion of first degree of right ear [any part, except ear drum], subsequent encounter | BILLABLE CODE |
| T20.511S | Corrosion of first degree of right ear [any part, except ear drum], sequela | BILLABLE CODE |
| T20.512 | Corrosion of first degree of left ear [any part, except ear drum] | NON-BILLABLE CODE |
| T20.512A | Corrosion of first degree of left ear [any part, except ear drum], initial encounter | BILLABLE CODE |
| T20.512D | Corrosion of first degree of left ear [any part, except ear drum], subsequent encounter | BILLABLE CODE |
| T20.512S | Corrosion of first degree of left ear [any part, except ear drum], sequela | BILLABLE CODE |
| T20.519 | Corrosion of first degree of unspecified ear [any part, except ear drum] | NON-BILLABLE CODE |
| T20.519A | Corrosion of first degree of unspecified ear [any part, except ear drum], initial encounter | BILLABLE CODE |
| T20.519D | Corrosion of first degree of unspecified ear [any part, except ear drum], subsequent encounter | BILLABLE CODE |
| T20.519S | Corrosion of first degree of unspecified ear [any part, except ear drum], sequela | BILLABLE CODE |
| T20.52 | Corrosion of first degree of lip(s) | NON-BILLABLE CODE |
| T20.52XA | Corrosion of first degree of lip(s), initial encounter | BILLABLE CODE |
| T20.52XD | Corrosion of first degree of lip(s), subsequent encounter | BILLABLE CODE |
| T20.52XS | Corrosion of first degree of lip(s), sequela | BILLABLE CODE |
| T20.53 | Corrosion of first degree of chin | NON-BILLABLE CODE |
| T20.53XA | Corrosion of first degree of chin, initial encounter | BILLABLE CODE |
| T20.53XD | Corrosion of first degree of chin, subsequent encounter | BILLABLE CODE |
| T20.53XS | Corrosion of first degree of chin, sequela | BILLABLE CODE |
| T20.54 | Corrosion of first degree of nose (septum) | NON-BILLABLE CODE |
| T20.54XA | Corrosion of first degree of nose (septum), initial encounter | BILLABLE CODE |
| T20.54XD | Corrosion of first degree of nose (septum), subsequent encounter | BILLABLE CODE |
| T20.54XS | Corrosion of first degree of nose (septum), sequela | BILLABLE CODE |
| T20.55 | Corrosion of first degree of scalp [any part] | NON-BILLABLE CODE |
| T20.55XA | Corrosion of first degree of scalp [any part], initial encounter | BILLABLE CODE |
| T20.55XD | Corrosion of first degree of scalp [any part], subsequent encounter | BILLABLE CODE |
| T20.55XS | Corrosion of first degree of scalp [any part], sequela | BILLABLE CODE |
| T20.56 | Corrosion of first degree of forehead and cheek | NON-BILLABLE CODE |
| T20.56XA | Corrosion of first degree of forehead and cheek, initial encounter | BILLABLE CODE |
| T20.56XD | Corrosion of first degree of forehead and cheek, subsequent encounter | BILLABLE CODE |
| T20.56XS | Corrosion of first degree of forehead and cheek, sequela | BILLABLE CODE |
| T20.57 | Corrosion of first degree of neck | NON-BILLABLE CODE |
| T20.57XA | Corrosion of first degree of neck, initial encounter | BILLABLE CODE |
| T20.57XD | Corrosion of first degree of neck, subsequent encounter | BILLABLE CODE |
| T20.57XS | Corrosion of first degree of neck, sequela | BILLABLE CODE |
| T20.59 | Corrosion of first degree of multiple sites of head, face, and neck | NON-BILLABLE CODE |
| T20.59XA | Corrosion of first degree of multiple sites of head, face, and neck, initial encounter | BILLABLE CODE |
| T20.59XD | Corrosion of first degree of multiple sites of head, face, and neck, subsequent encounter | BILLABLE CODE |
| T20.59XS | Corrosion of first degree of multiple sites of head, face, and neck, sequela | BILLABLE CODE |
