Miliaria rubra

This code represents a common inflammatory skin condition characterized by obstructed sweat ducts, leading to the leakage of sweat into the epidermis. It presents as small, red, itchy papules or vesicles, often described as "prickly heat," typically occurring in hot, humid environments.

Assign this code when documentation clearly indicates a diagnosis of miliaria rubra, also known as prickly heat or heat rash, characterized by red, inflamed lesions. This diagnosis is typically made clinically based on the characteristic rash and history of heat exposure.

• Differentiate from other forms of miliaria (e.g., miliaria crystallina, profunda) based on lesion morphology and depth of sweat duct obstruction.
• Ensure documentation specifies "rubra" to avoid confusion with other miliaria types.
• Consider external cause codes if the heat exposure is due to a specific environmental factor or activity.