ICD-10-CM 2027
ICD-10 code for abortus infection bacillus
From the official ICD-10-CM alphabetic index entry “Bacillus › abortus infection”. Page updated September 29, 2026.
About coding abortus infection bacillus
The ICD-10-CM code for abortus infection bacillus is A23.1 (Brucellosis due to Brucella abortus).
Within A23 (brucellosis), A23.1 is specifically for brucellosis due to Brucella abortus. Related codes cover due to Brucella melitensis (A23.0), due to Brucella suis (A23.2), due to Brucella canis (A23.3), other brucellosis (A23.8) and unspecified (A23.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), 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 abortus infection bacillus ICD-10 codes
What is the ICD-10 code for abortus infection bacillus?
- A23.1 — Brucellosis due to Brucella abortus.
Is A23.1 billable?
- Yes. A23.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A23.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A23.1 as a principal diagnosis.
Is A23.1 a CC or MCC?
- No. A23.1 is neither a CC nor an MCC under MS-DRG v44.0.