2026 ICD-10-CM Diagnosis Code K63.9Disease of intestine, unspecified

ICD-10-CM Codes›K00–K95›K55-K64›K63

ICD-10-CM K63.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K63.9 is a billable ICD-10-CM diagnosis code for disease of intestine, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.

Code Identity

ICD-10-CM Code
K63.9
Billable Status
Yes — Valid for Submission
Code Describes
Disease of intestine, unspecified
Short Description
Disease of intestine, unspecified
Same as the full description in the CMS dataset.
Parent Code
K63
Other diseases of intestine

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK55-K64Other diseases of intestines
CategoryK63Other diseases of intestine
This CodeK63.9Disease of intestine, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Autoimmune enteropathy
  • Autoimmune enteropathy and endocrinopathy with susceptibility to chronic infection syndrome
  • Bowel problem
  • Cathartic colon
  • Colonic lesion
  • Combined immunodeficiency, enteropathy spectrum
  • Congenital hypoplasia of adrenal gland
  • Congenital keratoderma
  • Disorder of cecum
  • Disorder of colon
  • Disorder of gastrointestinal tract co-occurrent with human immunodeficiency virus infection
  • Disorder of ileum
  • Disorder of intestine
  • Disorder of jejunum
  • Disorder of large intestine
  • Disorder of small intestine
  • Gastrointestinal tract problem
  • Human immunodeficiency virus enteropathy
  • Intestinal autonomic neuropathy
  • Lymphocyte count below reference range
  • Lymphocytopenia
  • MEDNIK syndrome
  • Megaloblastic anemia due to disease of small intestine
  • Megaloblastic anemia due to impaired absorption of folate
  • Megaloblastic anemia due to vitamin B12 deficiency secondary to intestinal disease
  • MIRAGE syndrome
  • Non-steroidal anti-inflammatory drug-induced enteropathy
  • Short stature co-occurrent and due to endocrine disorder

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disease, diseased
      • alimentary canal
    • Disease, diseased
      • bowel
    • Disease, diseased
      • cecum
    • Disease, diseased
      • colon
    • Disease, diseased
      • intestine
    • Disease, diseased
      • intestine
        • organic
    • Enteropathy
    • Lesion(s) (nontraumatic)
      • cecum
    • Lesion(s) (nontraumatic)
      • colon
    • Lesion(s) (nontraumatic)
      • gastrointestinal
    • Lesion(s) (nontraumatic)
      • ileocecal
    • Lesion(s) (nontraumatic)
      • ileum
    • Lesion(s) (nontraumatic)
      • intestine
    • Lesion(s) (nontraumatic)
      • rectosigmoid
    • Lesion(s) (nontraumatic)
      • sigmoid

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG025
Other specified and unspecified gastrointestinal disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Colonic Diseases

Your colon, also known as the large intestine, is part of your digestive system. It's a long, hollow tube at the end of your digestive tract where your body makes and stores stool. Many disorders affect the colon's ability to work properly. Some of these include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K63.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
569.9 Intestinal disorder NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K63.9Overview

Is K63.9 (Other diseases of intestine) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disease of intestine, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K63.9 group to?

When disease of intestine, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K63.9?

Under the General Equivalence Mappings, disease of intestine, unspecified converts to ICD-9-CM 569.9 (intestinal disorder NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.