Acquired acanthosis nigricans

This code represents an acquired skin condition characterized by hyperpigmentation and velvety thickening of the skin, typically found in body folds like the neck, axillae, and groin. It is not a primary disease but rather a cutaneous marker often associated with underlying systemic conditions.

Use this code when documentation specifies acquired acanthosis nigricans, indicating it developed later in life rather than being congenital. It is commonly seen in patients with obesity, insulin resistance, diabetes mellitus, endocrine disorders, or certain malignancies. Documentation should clearly state the diagnosis of acanthosis nigricans and specify its acquired nature.

• Always code the underlying systemic condition (e.g., diabetes, obesity, malignancy) first, as acanthosis nigricans is a manifestation of that condition.
• Distinguish from congenital forms of acanthosis nigricans, which would be coded differently.
• Ensure documentation specifies "acquired" to support the use of this particular code.