ICD-10 Code L02.423 – Furuncle of right upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.423 – Furuncle of right upper limb
What it is
This code identifies a furuncle, or boil, located on the right upper limb. It is a localized skin infection of a hair follicle that forms a painful, pus-filled nodule.
Clinical signs
Typical findings include a tender, red, swollen lesion that may drain pus or develop a central core. Clinical features vary; refer to documentation.
When to use this code
Use L02.423 when the provider documents a furuncle specifically on the right arm, forearm, wrist, or hand, and the site is clearly identified. Code it from the documented anatomic location, not from suspected or generalized skin infection. If the record only says “boil” without laterality or site detail, check documentation.
Do not use for
Do not use this code for a carbuncle, abscess, cellulitis, or an unspecified skin infection. Do not assign it if the lesion is on the left upper limb or another body site.
Coding tip
Confirm both laterality and exact upper-limb location in the note before selecting L02.423.