Pigmented purpuric dermatosis

This code describes a group of chronic, benign skin conditions characterized by reddish-brown or purplish macules and patches, often with petechiae, resulting from extravasation of red blood cells into the dermis. These dermatoses typically affect the lower extremities and are caused by inflammation of small blood vessels.

Assign this code when documentation specifies a diagnosis of pigmented purpuric dermatosis, such as Schamberg's disease, Majocchi's purpura, or Gougerot-Blum syndrome. This code is appropriate when the provider has clinically diagnosed the condition based on characteristic skin lesions and potentially a skin biopsy confirming capillaritis.

• Differentiate from other causes of purpura, such as thrombocytopenia or vasculitis, which have distinct codes.
• Ensure the documentation clearly states "pigmented purpuric dermatosis" or a specific subtype.
• This is a primary diagnosis code and does not typically require additional codes for underlying causes unless specified and clinically relevant.