2026 ICD-10-CM Diagnosis Code K57.32Diverticulitis of large intestine without perforation or abscess without bleeding

ICD-10-CM Codes›K00–K95›K55-K64›K57

ICD-10-CM K57.32
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K57.32 is a billable ICD-10-CM diagnosis code for diverticulitis of large intestine without perforation or abscess without bleeding. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 18 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diverticulosis and diverticulitis.

Code Identity

ICD-10-CM Code
K57.32
Billable Status
Yes — Valid for Submission
Code Describes
Diverticulitis of large intestine without perforation or abscess without bleeding
Short Description
Dvtrcli of lg int w/o perforation or abscess w/o bleeding
Parent Code
K57.3
Diverticular disease of large intestine without perforation or abscess

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK55-K64Other diseases of intestines
CategoryK57Diverticular disease of intestine
This CodeK57.32Diverticulitis of large intestine without perforation or abscess without bleeding

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Diverticulitis of ascending colon
  • Diverticulitis of cecum
  • Diverticulitis of colon
  • Diverticulitis of descending colon
  • Diverticulitis of large intestine
  • Diverticulitis of rectosigmoid
  • Diverticulitis of rectum
  • Diverticulitis of sigmoid colon
  • Fistula of large intestine due to diverticulitis
  • Stenosis of large intestine due to diverticulitis
  • Typhlitis

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 DIG013
Diverticulosis and diverticulitis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Typhlitis

    necrotizing inflammation of the cecum (typhlon in greek), sometimes spreading to the appendix and/or the ileum. symptoms include abdominal pain and diarrhea. its pathogenesis is multifactorial. typhlitis is often associated with neutropenia and chemotherapy in immunocompromised individuals (immunocompromised host).

Patient EducationClinical

Diverticulosis and Diverticulitis

Diverticula are small pouches, or sacs, that bulge outward through weak spots in your colon. They mostly form in the lower part of the colon. Diverticulosis is a condition in which you have these pouches. Most people who have diverticulosis do not have symptoms or problems. But sometimes the pouches can cause symptoms or become inflamed.

The full article covers:

  • What is diverticulosis?
  • What is diverticulitis?
  • What is diverticular disease?
  • What causes diverticulosis and diverticulitis?
  • Who is more likely to develop diverticulosis and diverticulitis?
  • What are the symptoms of diverticulosis and diverticulitis?
  • What other problems can diverticulosis and diverticulitis cause?
  • How are diverticulosis and diverticulitis diagnosed?

Read the full article at MedlinePlus

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

Convert K57.32 to ICD-9-CMHistory

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

ICD-9-CM
562.11 Dvrtcli colon w/o hmrhg
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 K57.32Overview

Is K57.32 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report diverticulitis of large intestine without perforation or abscess without bleeding on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K57.32 group to?

When diverticulitis of large intestine without perforation or abscess without bleeding is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.

Is K57.32 a CC or MCC?

CMS lists K57.32 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 18 closely related codes in its exclusion list.

What is the ICD-9 equivalent of K57.32?

Under the General Equivalence Mappings, diverticulitis of large intestine without perforation or abscess without bleeding converts to ICD-9-CM 562.11 (dvrtcli colon w/o hmrhg). The mapping is approximate, so confirm the match fits the documentation.