ICD-10 Code L02.222 – Furuncle of back [any part, except buttock and flank] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L02.222 – Furuncle of back [any part, except buttock and flank]
What it is
This code identifies a furuncle, or boil, located on the back, excluding the buttock and flank. It refers to a localized skin infection centered on a hair follicle.
Clinical signs
Typical findings include a painful, red, swollen nodule that may develop a central pustule or drain pus. Clinical features vary; refer to documentation.
When to use this code
Use L02.222 when the record clearly documents a furuncle on the back and does not place it on the buttock or flank. You may also use it when the clinician describes a boil or abscess-like lesion in that back location. Check documentation if the site is unclear.
Do not use for
Do not use this code for furuncles of the buttock or flank, or for generalized skin infection without a specified back site. If the note describes a different lesion type, code the documented condition instead.
Coding tip
Confirm the exact anatomic site in the note, because back, flank, and buttock are coded separately.