Anthrax, unspecified

This ICD-9-CM code represents a diagnosis of anthrax without further specification of the site or form of the infection. Anthrax is a serious infectious disease caused by the bacterium Bacillus anthracis, which can manifest as cutaneous, inhalational, gastrointestinal, or injectional forms. This code indicates a confirmed or suspected case where the specific clinical presentation is not documented or determined.

Use this code when the medical record clearly documents a diagnosis of anthrax but lacks details regarding the specific type (e.g., cutaneous, inhalational, gastrointestinal). This may occur in initial reports or when the specific form is still under investigation. Documentation should support a confirmed or highly suspected anthrax infection.

• Avoid using this unspecified code if documentation allows for a more specific anthrax code (e.g., 022.0 for cutaneous anthrax).
• Ensure the medical record supports the diagnosis, often involving laboratory confirmation or strong epidemiological evidence.
• Consider sequencing this code as the principal diagnosis if it is the primary reason for the encounter.