ICD-10 Code L02.831 – Carbuncle of Head [Any Part, Except Face] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.831 – Carbuncle of head [any part, except face]
What it is
L02.831 identifies a carbuncle on the head, excluding the face. It refers to a deeper skin infection involving a cluster of interconnected boils, usually caused by bacterial infection.
Clinical signs
Typical findings include a painful, swollen, red, and draining lesion with multiple openings or pustules. Clinical features vary; refer to documentation if the site or extent is unclear.
When to use this code
Use this code when the provider documents a carbuncle on the scalp, posterior head, or another nonfacial head area. It is appropriate when the record clearly distinguishes the lesion from the face and supports a carbuncle diagnosis.
If documentation only says “abscess,” “boil,” or “skin infection,” confirm the exact diagnosis before coding. Check documentation for laterality, location, and whether the lesion is on the head but not the face.
Do not use for
Do not use this code for facial carbuncles or for simple furuncles without documentation of a carbuncle. Check documentation if the lesion is on the neck, ear, or another nearby site.
Coding tip
Verify the anatomic site carefully; “head” excludes the face in this code.