ICD-10 Code L02.421 – Furuncle of right axilla (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.421 – Furuncle of right axilla
What it is
This code identifies a localized skin abscess, or boil, in the right armpit. It is used when the documentation specifies the right axillary site.
Clinical signs
Typical findings include a tender, red, swollen nodule that may drain pus. Clinical features vary; refer to documentation if the record does not clearly describe the lesion as a furuncle.
When to use this code
Use L02.421 when the provider documents a furuncle in the right axilla, including a boil or localized abscess at that site. Confirm the laterality and anatomic location in the note before assigning the code. If the chart only says “abscess” without site detail, check documentation.
Do not use for
Do not use this code for a furuncle in the left axilla, other body sites, or a generalized skin infection. Do not assume the diagnosis if the record only mentions swelling or redness without a furuncle diagnosis.
Coding tip
Match the laterality exactly; right axilla documentation supports L02.421, while missing or conflicting site detail requires clarification.