ICD-10 code for shigella infection

The ICD-10-CM code for shigella infection is A03.9 (Shigellosis, unspecified). The official index lists 12 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A03.9.

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.