2026 ICD-10-CM Diagnosis Code K57.31Diverticulosis of large intestine without perforation or abscess with bleeding

ICD-10-CM Codes›K00–K95›K55-K64›K57

ICD-10-CM K57.31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K57.31 is a billable ICD-10-CM diagnosis code for diverticulosis of large intestine without perforation or abscess with bleeding. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 377 through 379. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diverticulosis and diverticulitis and Gastrointestinal hemorrhage.

Code Identity

ICD-10-CM Code
K57.31
Billable Status
Yes — Valid for Submission
Code Describes
Diverticulosis of large intestine without perforation or abscess with bleeding
Short Description
Dvrtclos of lg int w/o perforation or abscess w 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 CodeK57.31Diverticulosis of large intestine without perforation or abscess with bleeding

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Diverticular disease of colon
  • Diverticulosis of cecum
  • Diverticulosis of colon
  • Diverticulosis of sigmoid colon
  • Diverticulosis of sigmoid colon with hemorrhage
  • Diverticulum and hemorrhage of large intestine
  • Diverticulum of large intestine
  • Hemorrhage of cecum
  • Hemorrhage of cecum due to diverticulosis
  • Hemorrhage of colon
  • Hemorrhage of colon due to diverticulosis
  • Intestinal hemorrhage with diverticulosis

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.

    • Diverticulosis
      • large intestine
        • with
          • bleeding

Clinical ClassificationClinical

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

CCSR DIG013
Diverticulosis and diverticulitis
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DIG021
Gastrointestinal hemorrhage
Default principal diagnosis: inpatient No · outpatient No

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 K57.31 to ICD-9-CMHistory

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

ICD-9-CM
562.12 Dvrtclo colon w 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 K57.31Overview

Is K57.31 a billable code?

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

What MS-DRG does K57.31 group to?

When diverticulosis of large intestine without perforation or abscess with bleeding is the principal diagnosis on an inpatient stay, it groups to MS-DRG 377, 378, 379, with relative weights from 0.6304 to 1.8280 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K57.31?

Under the General Equivalence Mappings, diverticulosis of large intestine without perforation or abscess with bleeding converts to ICD-9-CM 562.12 (dvrtclo colon w hmrhg). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.