ICD-10 Code A22.0 – Cutaneous anthrax (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A22.0 – Cutaneous anthrax
What it is
Use this code for anthrax infection limited to the skin. It identifies cutaneous exposure to Bacillus anthracis, typically after contact with infected animals or contaminated animal products.
Clinical signs
Typical findings include a painless papule that progresses to a vesicle and then a black eschar with surrounding swelling. Clinical features vary; refer to documentation.
When to use this code
Assign A22.0 when the provider documents cutaneous anthrax or confirms anthrax affecting the skin. Use it for cases described as skin infection, eschar, or localized anthrax without evidence of lung, gastrointestinal, or other systemic involvement.
If the record only notes suspected exposure or incomplete evaluation, check documentation before coding. Code the confirmed site and avoid assuming dissemination.
Do not use for
Do not use this code for inhalational, gastrointestinal, or unspecified anthrax. Also avoid it when the chart describes a skin lesion without documented anthrax.
Coding tip
Look for the provider’s documented site and wording; if anthrax is not confirmed, check documentation before assigning A22.0.