Erythema marginatum

This code identifies a specific type of skin rash characterized by transient, pink-to-red, non-pruritic lesions with raised, serpiginous borders and central clearing. It is a hallmark dermatological manifestation of acute rheumatic fever, though it can rarely be associated with other conditions.

Apply this code when documentation explicitly states "erythema marginatum" as a diagnosis. This typically occurs in the context of a patient presenting with symptoms suggestive of acute rheumatic fever, such as polyarthritis, carditis, chorea, or subcutaneous nodules, and the characteristic rash is observed.

• Always look for associated conditions, especially acute rheumatic fever (I00-I02), and code them accordingly.
• Do not confuse with other forms of erythema, such as erythema multiforme or erythema migrans, which have distinct clinical presentations and separate codes.
• Ensure the documentation clearly describes the characteristic migratory, annular, or serpiginous rash with central clearing.