| T20.40 | Corrosion of unspecified degree of head, face, and neck, unspecified site | NON-BILLABLE CODE |
| T20.40XA | Corrosion of unspecified degree of head, face, and neck, unspecified site, initial encounter | BILLABLE CODE |
| T20.40XD | Corrosion of unspecified degree of head, face, and neck, unspecified site, subsequent encounter | BILLABLE CODE |
| T20.40XS | Corrosion of unspecified degree of head, face, and neck, unspecified site, sequela | BILLABLE CODE |
| T20.41 | Corrosion of unspecified degree of ear [any part, except ear drum] | NON-BILLABLE CODE |
| T20.411 | Corrosion of unspecified degree of right ear [any part, except ear drum] | NON-BILLABLE CODE |
| T20.411A | Corrosion of unspecified degree of right ear [any part, except ear drum], initial encounter | BILLABLE CODE |
| T20.411D | Corrosion of unspecified degree of right ear [any part, except ear drum], subsequent encounter | BILLABLE CODE |
| T20.411S | Corrosion of unspecified degree of right ear [any part, except ear drum], sequela | BILLABLE CODE |
| T20.412 | Corrosion of unspecified degree of left ear [any part, except ear drum] | NON-BILLABLE CODE |
| T20.412A | Corrosion of unspecified degree of left ear [any part, except ear drum], initial encounter | BILLABLE CODE |
| T20.412D | Corrosion of unspecified degree of left ear [any part, except ear drum], subsequent encounter | BILLABLE CODE |
| T20.412S | Corrosion of unspecified degree of left ear [any part, except ear drum], sequela | BILLABLE CODE |
| T20.419 | Corrosion of unspecified degree of unspecified ear [any part, except ear drum] | NON-BILLABLE CODE |
| T20.419A | Corrosion of unspecified degree of unspecified ear [any part, except ear drum], initial encounter | BILLABLE CODE |
| T20.419D | Corrosion of unspecified degree of unspecified ear [any part, except ear drum], subsequent encounter | BILLABLE CODE |
| T20.419S | Corrosion of unspecified degree of unspecified ear [any part, except ear drum], sequela | BILLABLE CODE |
| T20.42 | Corrosion of unspecified degree of lip(s) | NON-BILLABLE CODE |
| T20.42XA | Corrosion of unspecified degree of lip(s), initial encounter | BILLABLE CODE |
| T20.42XD | Corrosion of unspecified degree of lip(s), subsequent encounter | BILLABLE CODE |
| T20.42XS | Corrosion of unspecified degree of lip(s), sequela | BILLABLE CODE |
| T20.43 | Corrosion of unspecified degree of chin | NON-BILLABLE CODE |
| T20.43XA | Corrosion of unspecified degree of chin, initial encounter | BILLABLE CODE |
| T20.43XD | Corrosion of unspecified degree of chin, subsequent encounter | BILLABLE CODE |
| T20.43XS | Corrosion of unspecified degree of chin, sequela | BILLABLE CODE |
| T20.44 | Corrosion of unspecified degree of nose (septum) | NON-BILLABLE CODE |
| T20.44XA | Corrosion of unspecified degree of nose (septum), initial encounter | BILLABLE CODE |
| T20.44XD | Corrosion of unspecified degree of nose (septum), subsequent encounter | BILLABLE CODE |
| T20.44XS | Corrosion of unspecified degree of nose (septum), sequela | BILLABLE CODE |
| T20.45 | Corrosion of unspecified degree of scalp [any part] | NON-BILLABLE CODE |
| T20.45XA | Corrosion of unspecified degree of scalp [any part], initial encounter | BILLABLE CODE |
| T20.45XD | Corrosion of unspecified degree of scalp [any part], subsequent encounter | BILLABLE CODE |
| T20.45XS | Corrosion of unspecified degree of scalp [any part], sequela | BILLABLE CODE |
| T20.46 | Corrosion of unspecified degree of forehead and cheek | NON-BILLABLE CODE |
| T20.46XA | Corrosion of unspecified degree of forehead and cheek, initial encounter | BILLABLE CODE |
| T20.46XD | Corrosion of unspecified degree of forehead and cheek, subsequent encounter | BILLABLE CODE |
| T20.46XS | Corrosion of unspecified degree of forehead and cheek, sequela | BILLABLE CODE |
| T20.47 | Corrosion of unspecified degree of neck | NON-BILLABLE CODE |
| T20.47XA | Corrosion of unspecified degree of neck, initial encounter | BILLABLE CODE |
| T20.47XD | Corrosion of unspecified degree of neck, subsequent encounter | BILLABLE CODE |
| T20.47XS | Corrosion of unspecified degree of neck, sequela | BILLABLE CODE |
| T20.49 | Corrosion of unspecified degree of multiple sites of head, face, and neck | NON-BILLABLE CODE |
| T20.49XA | Corrosion of unspecified degree of multiple sites of head, face, and neck, initial encounter | BILLABLE CODE |
| T20.49XD | Corrosion of unspecified degree of multiple sites of head, face, and neck, subsequent encounter | BILLABLE CODE |
| T20.49XS | Corrosion of unspecified degree of multiple sites of head, face, and neck, sequela | BILLABLE CODE |
