ICD-10 code for ischemic colitis

The ICD-10-CM code for ischemic colitis is K55.9 (Vascular disorder of intestine, unspecified). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K55.9.

Within K55, choose K55.9 (Vascular disorder of intestine, unspecified) only when documentation doesn't support a more specific option: acute vascular disorders of intestine (K55.0), chronic vascular disorders of intestine (K55.1), Angiodysplasia of colon (K55.2), necrotizing enterocolitis (K55.3) and other vascular disorders of intestine (K55.8).

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 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), 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.