ICD-10-CM 2027
ICD-10 code for anthrax colitis
From the official ICD-10-CM alphabetic index entry “Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › anthrax”. Page updated September 29, 2026.
About coding anthrax colitis
The ICD-10-CM code for anthrax colitis is A22.2 (Gastrointestinal anthrax).
Within A22 (anthrax), A22.2 is specifically for gastrointestinal anthrax. Related codes cover cutaneous anthrax (A22.0), pulmonary anthrax (A22.1), sepsis (A22.7), other forms of anthrax (A22.8) and unspecified (A22.9).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC, relative weight 1.7089), DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC, relative weight 0.9964) and DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC, relative weight 0.6941), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about anthrax colitis ICD-10 codes
What is the ICD-10 code for anthrax colitis?
- A22.2 — Gastrointestinal anthrax.
Is A22.2 billable?
- Yes. A22.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A22.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A22.2 as a principal diagnosis.
Is A22.2 a CC or MCC?
- A22.2 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.