ICD-10 Code L02.227 – Furuncle of Flank (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.227 – Furuncle of flank
What it is
This code identifies a furuncle, or boil, located on the flank. It refers to a localized skin infection of a hair follicle with a painful, pus-filled abscess.
Clinical signs
Typical findings include a tender, red, swollen nodule on the flank that may enlarge and drain purulent material. Clinical features vary; refer to documentation.
When to use this code
Use L02.227 when the provider documents a furuncle specifically on the flank, including a boil or localized abscess arising from a hair follicle. Code it when the location is clearly stated and the lesion is not described more generally.
If the note only says “skin abscess” or another site, check documentation before assigning this code.
Do not use for
Do not use this code for carbuncles, widespread skin infections, or abscesses at another anatomic site. Check documentation if the record does not clearly identify a flank furuncle.
Coding tip
Verify the exact body site in the provider note, because laterality is not relevant here but location is essential.