T21 (Burn and corrosion of trunk) compared with T22.70XA (Corrosion of third degree of shoulder and upper limb, except wrist and hand, unspecified site, initial encounter), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2). MedCoder-derived
Distinct conditions — both may be reported.
“burns and corrosion of axilla (T22.- with fifth character 4)”
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. T21 carries an Excludes2 note covering T22.70XA: “burns and corrosion of axilla (T22.- with fifth character 4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
| T21Burn and corrosion of trunk | T22.70XACorrosion of third degree of shoulder and upper limb, except wrist and hand, unspecified site, initial encounter | |
|---|---|---|
| Billing status | Non-billable header Report instead: T21.00XA, T21.00XD, T21.00XS, T21.01XA, T21.01XD | Billable |
| 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 | Burn and corrosion of trunk is a non-billable ICD-10-CM category code (T21). | Corrosion of third degree of shoulder and upper limb, except wrist and hand, unspecified site, initial encounter is a billable ICD-10-CM diagnosis code (T22.70XA). |
| 7th character | The appropriate 7th character is to be added to each code from category T21 | The appropriate 7th character is to be added to each code from category T22 |
| Includes | burns and corrosion of hip region 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] | 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 | code from category T31 or T32 to identify extent of body surface involved | external cause code to identify place (Y92) code from category T31 or T32 to identify extent of body surface involved |
| Code first | — | (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