Frostbite (T33-T34) ICD-10-CM
The T33–T34 section covers frostbite with 326 ICD-10-CM diagnosis codes, of which 222 are billable in fiscal year 2026. The section is organized into the 2 code ranges listed below.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Code Ranges in This Section 2 ranges · 326 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| T33 | Superficial frostbite (T33) | 163 | 111 |
| T34 | Frostbite with tissue necrosis (T34) | 163 | 111 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the T33–T34 Code Range
The T33-T34 ICD-10 codes classify frostbite injuries, distinguishing between superficial frostbite and frostbite with tissue necrosis. These codes cover frostbite affecting specific body parts including the head, ears, nose, limbs, and other sites.
Codes beginning with T33 describe superficial frostbite, identifying exact locations such as the ear (right, left, or unspecified), nose, neck, thorax, arms, hands, fingers, hips, thighs, knees, ankles, feet, and toes. These codes also specify the stage of treatment encounter: initial, subsequent, or sequela (long-term effects). For example, T33.521A covers superficial frostbite of the right hand during an initial encounter. The detailed breakdown aids precise documentation of mild frostbite cases.
The T34 series denotes frostbite with tissue necrosis, indicating more severe injury where tissue death has occurred. Similar to T33, these codes specify the body region and encounter type. Synonyms like "frostbite with tissue necrosis of upper limb" or "frostbite with tissue necrosis of ankle and foot" help coders connect common terms to exact codes. This classification supports clear coding for frostbite severity and body location, essential for clinical and billing accuracy.
Questions About This Page
How many codes are in the T33-T34 range?
The T33-T34 range contains 326 ICD-10-CM diagnosis codes in FY 2026. 222 of them are billable, and the rest are category headers that organize the section.
What conditions does T33-T34 cover?
The range covers frostbite. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
