| T28.90 | Corrosions of unspecified internal organs | NON-BILLABLE CODE |
| T28.90XA | Corrosions of unspecified internal organs, initial encounter | BILLABLE CODE |
| T28.90XD | Corrosions of unspecified internal organs, subsequent encounter | BILLABLE CODE |
| T28.90XS | Corrosions of unspecified internal organs, sequela | BILLABLE CODE |
| T28.91 | Corrosions of ear drum | NON-BILLABLE CODE |
| T28.911 | Corrosions of right ear drum | NON-BILLABLE CODE |
| T28.911A | Corrosions of right ear drum, initial encounter | BILLABLE CODE |
| T28.911D | Corrosions of right ear drum, subsequent encounter | BILLABLE CODE |
| T28.911S | Corrosions of right ear drum, sequela | BILLABLE CODE |
| T28.912 | Corrosions of left ear drum | NON-BILLABLE CODE |
| T28.912A | Corrosions of left ear drum, initial encounter | BILLABLE CODE |
| T28.912D | Corrosions of left ear drum, subsequent encounter | BILLABLE CODE |
| T28.912S | Corrosions of left ear drum, sequela | BILLABLE CODE |
| T28.919 | Corrosions of unspecified ear drum | NON-BILLABLE CODE |
| T28.919A | Corrosions of unspecified ear drum, initial encounter | BILLABLE CODE |
| T28.919D | Corrosions of unspecified ear drum, subsequent encounter | BILLABLE CODE |
| T28.919S | Corrosions of unspecified ear drum, sequela | BILLABLE CODE |
| T28.99 | Corrosions of other internal organs | NON-BILLABLE CODE |
| T28.99XA | Corrosions of other internal organs, initial encounter | BILLABLE CODE |
| T28.99XD | Corrosions of other internal organs, subsequent encounter | BILLABLE CODE |
| T28.99XS | Corrosions of other internal organs, sequela | BILLABLE CODE |
