Keratoderma, acquired

This code describes an acquired thickening of the stratum corneum, the outermost layer of the skin, which is not present at birth. This hyperkeratosis can manifest as localized or diffuse areas of hardened, scaly skin, often affecting the palms and soles. It is a secondary condition, developing due to various underlying causes rather than being a primary genetic disorder.

Use this code when documentation specifies an acquired form of keratoderma, differentiating it from congenital types. This diagnosis is appropriate when the patient presents with hyperkeratotic skin lesions that developed later in life, often in response to systemic diseases, medications, or environmental factors. Supporting documentation should clearly indicate the non-congenital nature of the condition.

• Differentiate carefully from congenital keratodermas, which are classified elsewhere.
• Always code any underlying systemic disease or external cause (e.g., drug reaction, malignancy) as a primary diagnosis if known and relevant.
• Ensure documentation specifies "acquired" to justify the use of this particular code.