ICD-10 Code L02.429 – Furuncle of limb, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.429 – Furuncle of limb, unspecified
What it is
This code identifies a boil, or localized skin abscess, on a limb when the exact site is not specified. It indicates a bacterial infection centered in a hair follicle or nearby skin tissue.
Clinical signs
Typical findings include a painful, red, swollen nodule that may enlarge and drain pus. Clinical features vary; refer to documentation if the note does not clearly describe a furuncle on an arm or leg.
When to use this code
Use L02.429 when the provider documents a furuncle on an extremity but does not specify the left, right, upper, or lower limb. It also fits when the record names a boil on a limb without enough detail for a more specific code. Check documentation if multiple skin lesions are mentioned.
Do not use for
Do not use this code for abscesses in other body sites or for cellulitis without a furuncle diagnosis. If the limb location is documented more precisely, choose the more specific code.
Coding tip
Review the note for laterality and exact limb location before defaulting to an unspecified code.