ICD-10-CM 2027
ICD-10 code for shigella sepsis
From the official ICD-10-CM alphabetic index entry “Sepsis (generalized) (unspecified organism) › Shigella”. Page updated September 29, 2026.
About coding shigella sepsis
The ICD-10-CM code for shigella sepsis is A03.9 (Shigellosis, unspecified).
Within A03, choose A03.9 (unspecified) only when documentation doesn't support a more specific option: due to Shigella dysenteriae (A03.0), due to Shigella flexneri (A03.1), due to Shigella boydii (A03.2), due to Shigella sonnei (A03.3) and other shigellosis (A03.8).
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 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 shigella sepsis ICD-10 codes
What is the ICD-10 code for shigella sepsis?
- A03.9 — Shigellosis, unspecified.
Is A03.9 billable?
- Yes. A03.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A03.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A03.9 as a principal diagnosis.
Is A03.9 a CC or MCC?
- No. A03.9 is neither a CC nor an MCC under MS-DRG v44.0.