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
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Chronic Condition
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. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 72 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diverticulosis and diverticulitis and Gastrointestinal hemorrhage.
Code Identity
Code Classification
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.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
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.
Is K57.31 a CC or MCC?
CMS lists K57.31 as an MCC (major complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 72 closely related codes in its exclusion list.
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.
