ICD-10 Code L02.539 – Carbuncle of unspecified hand (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.539 – Carbuncle of unspecified hand
What it is
This code identifies a carbuncle on the hand when the affected hand is not specified. A carbuncle is a deeper skin infection made up of interconnected boils.
Clinical signs
Typical findings include a painful, swollen, red, and tender area with drainage or multiple pustular openings. Clinical features vary; refer to documentation.
When to use this code
Use L02.539 when the provider documents a carbuncle of the hand but does not name the right or left hand. It also fits notes that describe a hand carbuncle without further laterality detail. If the record specifies a different site or a more general skin abscess, do not assume this code.
Do not use for
Do not use this code for a simple abscess, furuncle, or cellulitis without documentation of a carbuncle. Check documentation if the hand side or exact lesion type is unclear.
Coding tip
Always verify that “hand” is documented and that no laterality is available before assigning this unspecified code.