ICD-10 Code L02.436 – Carbuncle of left lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.436 – Carbuncle of left lower limb
What it is
This code identifies a carbuncle, which is a deeper skin infection made up of connected boils, located on the left lower limb. It indicates a localized bacterial abscess process in that specific anatomic site.
Clinical signs
Typical findings include a painful, swollen, red, and tender area with multiple draining points or pus. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly documents a carbuncle on the left leg, ankle, foot, or other left lower-limb site. The laterality matters, so confirm the infection is on the left side. If the note only says “abscess” or does not specify location, check documentation before assigning this code.
Do not use for
Do not use it for a furuncle, cellulitis, or an abscess without documentation of a carbuncle. Do not code it when the affected side is not stated or when the infection is elsewhere.
Coding tip
Verify both the diagnosis term and left-sided location in the provider note before coding.