Cutaneous anthrax

This code represents the localized skin infection caused by Bacillus anthracis, characterized by a papule that progresses to a vesicle, then a necrotic ulcer with a black eschar. It is the most common form of anthrax and typically results from direct contact with infected animals or contaminated animal products.

Assign this code when documentation confirms a diagnosis of cutaneous anthrax, often presenting as a painless, pruritic lesion with subsequent ulceration and eschar formation. Supporting documentation should include a definitive diagnosis from a physician, often based on clinical presentation and laboratory confirmation (e.g., culture, PCR).

• Do not confuse with other skin infections like staphylococcal or streptococcal impetigo, which lack the characteristic black eschar.
• Ensure documentation specifies "cutaneous" anthrax to differentiate from other forms (e.g., inhalation, gastrointestinal).
• Consider Z20.810 (Contact with and exposure to anthrax) if exposure is documented but the disease has not yet manifested.