ICD-10 Code L02.426 – Furuncle of left lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.426 – Furuncle of left lower limb
What it is
This code identifies a localized boil, or furuncle, on the left lower limb. It usually reflects a deep infection of a hair follicle with surrounding skin inflammation.
Clinical signs
Typical findings include a tender, red, swollen nodule that may develop a central pustule or drain pus. Clinical features vary; refer to documentation if the location or diagnosis is unclear.
When to use this code
Use L02.426 when the provider documents a furuncle specifically on the left leg, thigh, calf, ankle, or foot, and no more specific site is given. It is appropriate when the record clearly identifies the lesion as a furuncle rather than a cyst, abscess, or cellulitis.
Do not use for
Do not use this code for furuncles on the right lower limb or unspecified lower limb. Check documentation if the condition is described only as a skin abscess, carbuncle, or other localized infection.
Coding tip
Match the laterality and anatomic site exactly as documented before assigning this code.