ICD-10 Code L02.838 – Carbuncle of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.838 – Carbuncle of other sites
What it is
This code identifies a carbuncle, which is a deeper skin infection made up of connected boils, located at sites other than those listed in more specific ICD-10 options. Use it when documentation clearly states carbuncle and the site is not otherwise specified.
Clinical signs
Typical findings include a painful, red, swollen area with drainage or multiple openings. Clinical features vary; refer to documentation, especially when the record describes the anatomic site or confirms a carbuncle rather than a simple abscess.
When to use this code
Use L02.838 when the provider documents a carbuncle at an unspecified or “other” site that is not captured by a more specific code. You should rely on the documented diagnosis and location, and code additional sites separately if clearly recorded.
Do not use for
Do not use this code for a simple furuncle, cellulitis, or an abscess without documentation of a carbuncle. If the site is specifically coded elsewhere, choose the more precise option instead.
Coding tip
Check the note for the exact site and whether the lesion is documented as a carbuncle before selecting this code.