T20.43XS (Corrosion of unspecified degree of chin, sequela) compared with T28.91 (Corrosions of ear drum), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Distinct conditions — both may be reported.
“burn and corrosion of ear drum (T28.41, T28.91)”
An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.
Source: CMS ICD-10-CM tabular instructional notes
Yes, when both are documented. T20.43XS carries an Excludes2 note covering T28.91: “burn and corrosion of ear drum (T28.41, T28.91)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
| T20.43XSCorrosion of unspecified degree of chin, sequela | T28.91Corrosions of ear drum | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Corrosion of unspecified degree of chin, sequela is a billable ICD-10-CM diagnosis code (T20.43S). | Corrosions of ear drum is a non-billable ICD-10-CM category code (T28.91). |
| 7th character | The appropriate 7th character is to be added to each code from category T20 | The appropriate 7th character is to be added to each code from category T28 |
| Includes | burns and corrosions of first degree [erythema] burns and corrosions of second degree [blisters][epidermal loss] burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss] | — |
| Use additional code | external cause code to identify place (Y92) code from category T31 or T32 to identify extent of body surface involved | external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98) external cause code to identify place (Y92) |
| Code first | (T51-T65) to identify chemical and intent | (T51-T65) to identify chemical and intent |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources