2026 ICD-10-CM Diagnosis Code K57.51Diverticulosis of both small and large intestine without perforation or abscess with bleeding

ICD-10-CM Codes›K00–K95›K55-K64›K57

ICD-10-CM K57.51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K57.51 is a billable ICD-10-CM diagnosis code for diverticulosis of both small and 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
K57.51
Billable Status
Yes — Valid for Submission
Code Describes
Diverticulosis of both small and large intestine without perforation or abscess with bleeding
Short Description
Dvrtclos of both small and lg int w/o perf or abscs w bleed
Parent Code
K57.5
Diverticular disease of both small and large intestine without perforation or abscess

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK55-K64Other diseases of intestines
CategoryK57Diverticular disease of intestine
This CodeK57.51Diverticulosis of both small and large intestine without perforation or abscess with bleeding

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
          • small intestine
            • with bleeding
    • Diverticulosis
      • small intestine
        • with
          • 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 K57.51 to ICD-9-CMHistory

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

ICD-9-CM
562.12 Dvrtclo colon w hmrhg
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
562.02 Dvrtclo sml int w hmrhg
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

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 K57.51Overview

Is K57.51 a billable code?

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

What MS-DRG does K57.51 group to?

When diverticulosis of both small and 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 K57.51?

Under the General Equivalence Mappings, diverticulosis of both small and large intestine without perforation or abscess with bleeding converts to ICD-9-CM 562.12 (dvrtclo colon w hmrhg) and 562.02 (dvrtclo sml int 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.