ICD-10-CM 2027
ICD-10 code for intestine disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › intestine”. Page updated September 29, 2026.
About coding intestine disease
The ICD-10-CM code for intestine disease is K63.9 (Disease of intestine, 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 K63.9.
Within K63, choose K63.9 (Disease of intestine, unspecified) only when documentation doesn't support a more specific option: abscess of intestine (K63.0), perforation of intestine (nontraumatic) (K63.1), fistula of intestine (K63.2), ulcer of intestine (K63.3), Enteroptosis (K63.4), polyp of colon (K63.5) and other specified diseases of intestine (K63.8).
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 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.
More specific intestine disease codes (official index)
- functional K59.9 — Functional intestinal disorder, unspecified
- psychogenic F45.8 — Other somatoform disorders
- specified NEC K59.89 — Other specified functional intestinal disorders
- organic K63.9 — Disease of intestine, unspecified
- protozoal A07.9 — Protozoal intestinal disease, unspecified
- specified NEC K63.89 — Other specified diseases of intestine
Common questions about intestine disease ICD-10 codes
What is the ICD-10 code for intestine disease?
- K63.9 — Disease of intestine, unspecified. More specific codes apply when the documentation supports them: K59.9, F45.8, K59.89, K63.9 and others below.
What is the ICD-10 code for functional intestine disease?
- K59.9 — Functional intestinal disorder, unspecified.
What is the ICD-10 code for organic intestine disease?
- K63.9 — Disease of intestine, unspecified.
What is the ICD-10 code for protozoal intestine disease?
- A07.9 — Protozoal intestinal disease, unspecified.
Is K63.9 billable?
- Yes. K63.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K63.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K63.9 as a principal diagnosis.
Is K63.9 a CC or MCC?
- No. K63.9 is neither a CC nor an MCC under MS-DRG v44.0.