ICD-10 code for viral enteritis

The ICD-10-CM code for viral enteritis is A08.4 (Viral intestinal infection, unspecified). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A08.4.

Within A08, choose A08.4 (Viral intestinal infection, unspecified) only when documentation doesn't support a more specific option: Rotaviral enteritis (A08.0), acute gastroenteropathy due to Norwalk agent and other small round viruses (A08.1), adenoviral enteritis (A08.2), other viral enteritis (A08.3) and other specified intestinal infections (A08.8).

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 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), 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.