S89.91XA (Unspecified injury of right lower leg, initial encounter) compared with T34 (Frostbite with tissue necrosis), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Distinct conditions — both may be reported.
“frostbite (T33-T34)”
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. S89.91XA carries an Excludes2 note covering T34: “frostbite (T33-T34)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
| S89.91XAUnspecified injury of right lower leg, initial encounter | T34Frostbite with tissue necrosis | |
|---|---|---|
| Billing status | Billable | Non-billable header Report instead: T34.011A, T34.011D, T34.011S, T34.012A, T34.012D |
| 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 | Unspecified injury of right lower leg, initial encounter is a billable ICD-10-CM diagnosis code (S89.91A). | Frostbite with tissue necrosis is a non-billable ICD-10-CM category code (T34). |
| 7th character | The appropriate 7th character is to be added to each code in subcategory S89.9 | The appropriate 7th character is to be added to each code from category T34 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources