ICD-10 Code L83 – Acanthosis nigricans (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L83 – Acanthosis nigricans
What it is
L83 identifies acanthosis nigricans, a skin finding marked by dark, thickened, velvety plaques. You use it when documentation names this specific dermatologic condition.
Clinical signs
Typical findings include symmetric hyperpigmented, velvety skin changes, most often in body folds such as the neck, axillae, or groin. Clinical features vary; refer to documentation.
When to use this code
Use L83 when the record clearly documents acanthosis nigricans as the diagnosis or a confirmed skin finding. It may appear as an incidental exam finding or a listed dermatologic problem. Code the condition only when the provider identifies it; check documentation if the note describes discoloration without naming the disorder.
Do not use for
Do not assign L83 for nonspecific hyperpigmentation, rash, or skin thickening without documentation of acanthosis nigricans. If the cause is uncertain, check documentation.
Coding tip
Code the documented skin diagnosis, not the suspected underlying cause, unless the provider states it clearly.