A22.9 Anthrax, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from A22 Anthrax

Includes

• infection due to Bacillus anthracis

MS-DRG index

Defines the logic of DRG(s) 867-869 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 022.9 Anthrax, unspecified

Diagnosis Index entries for A22.9

• Anthrax
• Bacillus › anthracis infection
• Chabert's disease
• Disease, diseased › Chabert's

Nearby codes

• A22.0 Cutaneous anthrax
• A22.1 Pulmonary anthrax
• A22.2 Gastrointestinal anthrax
• A22.7 Anthrax sepsis
• A22.8 Other forms of anthrax
• A22.9 Anthrax, unspecified (this code)