2026 ICD-10-CM Diagnosis Code K63.2Fistula of intestine

ICD-10-CM Codes›K00–K95›K55-K64›K63

ICD-10-CM K63.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K63.2 is a billable ICD-10-CM diagnosis code for fistula of intestine. 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
K63.2
Billable Status
Yes — Valid for Submission
Code Describes
Fistula of intestine
Short Description
Fistula of intestine
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 CodeK63.2Fistula of intestine

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abdominal wall fistula
  • Acquired choledochojejunal fistula
  • Arterial-enteric fistula
  • Colocolic fistula
  • Colonic fistula
  • Colovascular fistula
  • Enteroanal fistula
  • Enterocolic fistula
  • Enterocutaneous fistula
  • Enteroenteric fistula
  • External large bowel fistula
  • External small bowel fistula
  • Fecal fistula
  • Fistula of bile duct
  • Fistula of intestine
  • Fistula of intestine to abdominal wall
  • Fistula of large intestine due to diverticulitis
  • Fistula of sigmoid colon
  • Fistula of small intestine due to diverticulitis
  • Ileorectal fistula
  • Ileoumbilical fistula
  • Internal large bowel fistula
  • Internal small bowel fistula
  • Intestinourinary fistula
  • Jejunal fistula
  • Jejunocolic fistula
  • Jejunocutaneous fistula
  • Jejunoenteric fistula
  • Large bowel fistula
  • Small bowel fistula
  • Umbilical fistula
  • Vascular graft enteric fistula

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Code Also

  • , if applicable, disruption of internal operation surgical wound T81.32

Type 1 Excludes

Type 2 Excludes

  • fistula of anal and rectal regions K60
  • fistula of appendix K38.3
  • intestinal-genital fistula, female N82.2 N82.4
  • vesicointestinal fistula N32.1

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.

    • Fistula(cutaneous)
      • abdomen (wall)
    • Fistula(cutaneous)
      • abdomen (wall)
        • intestine NEC
    • Fistula(cutaneous)
      • abdominorectal
    • Fistula(cutaneous)
      • abdominosigmoidal
    • Fistula(cutaneous)
      • cecosigmoidal
    • Fistula(cutaneous)
      • cecum
    • Fistula(cutaneous)
      • colon
    • Fistula(cutaneous)
      • enterocolic
    • Fistula(cutaneous)
      • enterocutaneous
    • Fistula(cutaneous)
      • fecal
    • Fistula(cutaneous)
      • ileorectal or ileosigmoidal
    • Fistula(cutaneous)
      • ileum
    • Fistula(cutaneous)
      • intestine NEC
    • Fistula(cutaneous)
      • intestinocolonic (abdominal)
    • Fistula(cutaneous)
      • jejunum
    • Fistula(cutaneous)
      • pericecal
    • Fistula(cutaneous)
      • perineosigmoidal
    • Fistula(cutaneous)
      • rectosigmoid (intercommunicating)
    • Fistula(cutaneous)
      • sigmoid
    • Fistula(cutaneous)
      • stercoral

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 K63.2 to ICD-9-CMHistory

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

ICD-9-CM
569.81 Intestinal fistula
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 K63.2Overview

Is K63.2 (Other diseases of intestine) a billable code?

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

What MS-DRG does K63.2 group to?

When fistula of intestine 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 K63.2?

Under the General Equivalence Mappings, fistula of intestine converts to ICD-9-CM 569.81 (intestinal fistula). 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.