ICD-10 Code L70.1 – Acne conglobata (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L70.1 – Acne conglobata
What it is
Acne conglobata is a severe form of acne characterized by deep, inflammatory lesions. It usually affects the face, chest, back, or buttocks and may lead to scarring.
Clinical signs
Typical findings include nodules, abscesses, draining sinuses, and comedones. Clinical features vary; refer to documentation for lesion extent, chronicity, and any scarring.
When to use this code
Use L70.1 when the provider documents acne conglobata by name or describes severe nodulocystic acne with sinus tracts and scarring. It is appropriate when the record clearly supports this specific diagnosis. If the note only says “acne” or “severe acne,” check documentation before coding.
Do not use for
Do not use this code for ordinary acne vulgaris, isolated comedones, or other acne variants unless acne conglobata is specifically documented. Do not infer the diagnosis from severity alone.
Coding tip
Code the most specific acne diagnosis documented, and query the provider if the record does not clearly distinguish acne conglobata from other severe acne forms.