2026 ICD-10-CM Diagnosis Code K57.80Diverticulitis of intestine, part unspecified, with perforation and abscess without bleeding

ICD-10-CM Codes›K00–K95›K55-K64›K57

ICD-10-CM K57.80
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K57.80 is a billable ICD-10-CM diagnosis code for diverticulitis of intestine, part unspecified, with perforation and 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. Coders also document this condition as perforated diverticulum of intestine. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diverticulosis and diverticulitis, Gastrointestinal and biliary perforation, and Peritonitis and intra-abdominal abscess.

Code Identity

ICD-10-CM Code
K57.80
Billable Status
Yes — Valid for Submission
Code Describes
Diverticulitis of intestine, part unspecified, with perforation and abscess without bleeding
Short Description
Dvtrcli of intest, part unsp, w perf and abscess w/o bleed
Parent Code
K57.8
Diverticulitis of intestine, part unspecified, with perforation and abscess

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK55-K64Other diseases of intestines
CategoryK57Diverticular disease of intestine
This CodeK57.80Diverticulitis of intestine, part unspecified, with perforation and abscess without bleeding

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Perforated diverticulum of intestine
  • Perforation of intestine due to diverticulitis of gastrointestinal tract

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
CCSR DIG006
Gastrointestinal and biliary perforation
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG016
Peritonitis and intra-abdominal abscess
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Abscess

An abscess is a pocket of pus. You can get an abscess almost anywhere in your body. When an area of your body becomes infected, your body's immune system tries to fight the infection. White blood cells go to the infected area, collect within the damaged tissue, and cause inflammation. During this process, pus forms.

Read the full article at MedlinePlus

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

Convert K57.80 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
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
569.5 Intestinal abscess
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 K57.80Overview

Is K57.80 a billable code?

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

What MS-DRG does K57.80 group to?

When diverticulitis of intestine, part unspecified, with perforation and 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 K57.80 a CC or MCC?

CMS lists K57.80 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 K57.80?

Under the General Equivalence Mappings, diverticulitis of intestine, part unspecified, with perforation and abscess without bleeding converts to ICD-9-CM 562.11 (dvrtcli colon w/o hmrhg) and 569.5 (intestinal abscess). The mapping is approximate, so confirm the match fits the documentation.