Intrinsic (allergic) eczema

This code represents a form of eczema that originates from internal factors within the body, rather than external irritants or allergens. It is characterized by chronic, relapsing inflammatory skin lesions, often associated with a personal or family history of atopy (e.g., asthma, allergic rhinitis). The term "intrinsic" emphasizes the endogenous nature of the allergic response.

Assign this code when documentation specifies "intrinsic eczema," "endogenous eczema," or "allergic eczema" where the allergic trigger is internal and not clearly identifiable as an external contactant. This diagnosis is typically made after ruling out extrinsic causes and often involves a history of atopic dermatitis.

• Differentiate carefully from contact dermatitis (extrinsic eczema), which is caused by external irritants or allergens.
• Ensure documentation explicitly states "intrinsic" or implies an endogenous origin for the allergic eczema.
• Consider additional codes for specific manifestations or complications, such as secondary infection, if present.