2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K63.9 is a billable ICD-10-CM diagnosis code for disease of intestine, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K63.9: its own notes plus those printed at Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K63.9Overview

What is the ICD-10 code for disease of intestine, unspecified?

The ICD-10-CM code for disease of intestine, unspecified is K63.9 (sometimes written as K639). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 394, 395, 393, with relative weights from 0.6379 to 1.5877 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.