ICD-10 Code L02.439 – Carbuncle of limb, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.439 – Carbuncle of limb, unspecified
What it is
This code identifies a carbuncle located on a limb, but the record does not specify the exact arm or leg site. A carbuncle is a deeper skin infection made up of interconnected boils.
Clinical signs
Typical findings include a painful, swollen, red area with multiple draining points or pus. Clinical features vary; refer to documentation.
When to use this code
Use L02.439 when the provider documents a carbuncle on an extremity and does not name the precise limb or laterality. It also fits when the note says “carbuncle of limb” without further detail. If the site is later clarified, code to the more specific limb location instead.
Do not use for
Do not use this code for a simple boil, abscess, or furuncle unless the documentation specifically supports a carbuncle. Check documentation if the infection is described at a more exact site.
Coding tip
Look for limb laterality and exact location first; unspecified codes are appropriate only when the record lacks that detail.