ICD-10-CM 2027
ICD-10 code for colon disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › colon”. Page updated September 29, 2026.
About coding colon disease
The ICD-10-CM code for colon disease is K63.9 (Disease of intestine, unspecified). The official index lists 3 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 colon disease codes (official index)
Common questions about colon disease ICD-10 codes
What is the ICD-10 code for colon disease?
- K63.9 — Disease of intestine, unspecified. More specific codes apply when the documentation supports them: K59.9, Q43.2, K55.039.
What is the ICD-10 code for functional colon disease?
- K59.9 — Functional intestinal disorder, unspecified.
What is the ICD-10 code for ischemic colon disease?
- K55.039 — Acute (reversible) ischemia of large intestine, extent 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.