Erythema ab igne [dermatitis ab igne]

This code represents a reticulated, erythematous, hyperpigmented skin lesion caused by chronic or repeated exposure to moderate heat without burning. It typically presents as a net-like pattern on the skin, often with telangiectasias and epidermal atrophy in later stages.

Use this code when documentation clearly indicates a diagnosis of erythema ab igne, often seen in individuals who use heating pads, laptops, or other heat sources directly on the skin for prolonged periods. Documentation should specify the characteristic reticulated erythema and history of heat exposure.

• Ensure the documentation differentiates this from other forms of dermatitis or burns.
• Do not confuse with thermal burns (T20-T32) as erythema ab igne is caused by chronic, non-blistering heat exposure.
• Look for specific mention of the "ab igne" etiology to support this diagnosis.