Chilblains

This code represents chilblains, also known as pernio, which are localized inflammatory lesions of the skin resulting from repeated exposure to cold, non-freezing temperatures. These lesions typically present as itchy, red, or purple papules, nodules, or plaques, often on the extremities such as fingers, toes, ears, and nose.

Use this code when documentation clearly indicates a diagnosis of chilblains, pernio, or erythema pernio. This typically occurs after exposure to cold, damp conditions, leading to characteristic skin changes. Supporting documentation should describe the appearance and location of the lesions, along with a history of cold exposure.

• Differentiate from frostbite (e.g., 991.0-991.4), which involves tissue damage due to freezing temperatures.
• Consider an additional code for any associated complications, such as ulceration (e.g., 707.x).
• Ensure the documentation specifies "chilblains" or "pernio" to avoid confusion with other cold-related injuries.