2026 ICD-10-CM Diagnosis Code K80.18Calculus of gallbladder with other cholecystitis without obstruction

ICD-10-CM Codes›K00–K95›K80-K87›K80

ICD-10-CM K80.18
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K80.18 is a billable ICD-10-CM diagnosis code for calculus of gallbladder with other cholecystitis without obstruction. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Biliary tract disease.

Code Identity

ICD-10-CM Code
K80.18
Billable Status
Yes — Valid for Submission
Code Describes
Calculus of gallbladder with other cholecystitis without obstruction
Short Description
Calculus of gallbladder w oth cholecystitis w/o obstruction
Parent Code
K80.1
Calculus of gallbladder with other cholecystitis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK80Cholelithiasis
This CodeK80.18Calculus of gallbladder with other cholecystitis without obstruction

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.

    • Calculus, calculi, calculous
      • gallbladder
        • with
          • cholecystitis
            • specified NEC

Clinical ClassificationClinical

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

CCSR DIG017
Biliary tract disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Bile Duct Diseases

Your liver makes a digestive juice called bile. Your gallbladder stores it between meals. When you eat, your gallbladder pushes the bile into tubes called bile ducts. They carry the bile to your small intestine. The bile helps break down fat. It also helps the liver get rid of toxins and wastes.

Read the full article at MedlinePlus

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

Convert K80.18 to ICD-9-CMHistory

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

ICD-9-CM
574.10 Cholelith w cholecys NEC
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 K80.18Overview

Is K80.18 (Calculus of gallbladder with other cholecystitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report calculus of gallbladder with other cholecystitis without obstruction on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K80.18 group to?

When calculus of gallbladder with other cholecystitis without obstruction is the principal diagnosis on an inpatient stay, it groups to MS-DRG 444, 445, 446, with relative weights from 0.8273 to 1.6709 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K80.18?

Under the General Equivalence Mappings, calculus of gallbladder with other cholecystitis without obstruction converts to ICD-9-CM 574.10 (cholelith w cholecys NEC). The mapping is approximate, so confirm the match fits the documentation.

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.