ICD-10 Code L02.424 – Furuncle of left upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.424 – Furuncle of left upper limb
What it is
This code identifies a localized boil, or furuncle, on the left upper limb. It reflects a skin abscess centered on a hair follicle in the arm, forearm, wrist, or hand, depending on documentation.
Clinical signs
Typical findings include a painful, red, swollen nodule with possible drainage of pus. Clinical features vary; refer to documentation for the exact site and whether the lesion is a furuncle rather than a broader skin infection.
When to use this code
Use L02.424 when the provider documents a furuncle specifically on the left upper limb. This is appropriate when the record identifies the lesion as a boil or furuncle and localizes it to the left arm or related upper-limb area.
Do not infer laterality or location from context alone. If the note says abscess, cellulitis, or another skin infection without a furuncle diagnosis, check documentation before assigning this code.
Do not use for
Do not use this code for abscesses of other sites, unspecified skin infections, or furuncles on the right or unspecified upper limb. Check documentation if the lesion is described only as a cyst, carbuncle, or cellulitis.
Coding tip
Verify both the diagnosis term and the left-sided upper-limb location before coding.