2026 ICD-10-CM Diagnosis Code K82.A1Gangrene of gallbladder in cholecystitis

ICD-10-CM Codes›K00–K95›K80-K87›K82

ICD-10-CM K82.A1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K82.A1 is a billable ICD-10-CM diagnosis code for gangrene of gallbladder in cholecystitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 444 through 446. The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Biliary tract disease and Gangrene.

Code Identity

ICD-10-CM Code
K82.A1
Billable Status
Yes — Valid for Submission
Code Describes
Gangrene of gallbladder in cholecystitis
Short Description
Gangrene of gallbladder in cholecystitis
Same as the full description in the CMS dataset.
Parent Code
K82.A
Disorders of gallbladder in diseases classified elsewhere

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK82Other diseases of gallbladder
This CodeK82.A1Gangrene of gallbladder in cholecystitis

Code EditsBilling

Medicare Code Editor checks that affect claim validity for K82.A1.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

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.

    • Cholecystitis
      • with
        • gangrene of gallbladder

Clinical ClassificationClinical

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

CCSR DIG017
Biliary tract disease
Default principal diagnosis: inpatient No · outpatient No
CCSR CIR028
Gangrene
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Gallbladder Diseases

Your gallbladder is a pear-shaped organ under your liver. It stores bile, a fluid made by your liver to digest fat. As your stomach and intestines digest food, your gallbladder releases bile through a tube called the common bile duct. The duct connects your gallbladder and liver to your small intestine.

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement K82.A1 replaces the following previously assigned code(s):

  • K81.0 - Acute cholecystitis
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K82.A1Overview

Is K82.A1 (Disorders of gallbladder in diseases classified elsewhere) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report gangrene of gallbladder in cholecystitis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K82.A1 group to?

On inpatient claims, gangrene of gallbladder in cholecystitis maps to MS-DRG 444, 445, 446, with relative weights from 0.8273 to 1.6709 depending on complications. Higher weights mean higher Medicare reimbursement.

Can K82.A1 be a principal diagnosis?

No. This is a manifestation code: gangrene of gallbladder in cholecystitis describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.