2026 ICD-10-CM Diagnosis Code K80.64Calculus of gallbladder and bile duct with chronic cholecystitis without obstruction

ICD-10-CM Codes›K00–K95›K80-K87›K80

ICD-10-CM K80.64
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K80.64 is a billable ICD-10-CM diagnosis code for calculus of gallbladder and bile duct with chronic 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. Coders also document this condition as calculus of bile duct with chronic cholecystitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Biliary tract disease.

Code Identity

ICD-10-CM Code
K80.64
Billable Status
Yes — Valid for Submission
Code Describes
Calculus of gallbladder and bile duct with chronic cholecystitis without obstruction
Short Description
Calculus of GB and bile duct w chronic cholecyst w/o obst
Parent Code
K80.6
Calculus of gallbladder and bile duct with cholecystitis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK80Cholelithiasis
This CodeK80.64Calculus of gallbladder and bile duct with chronic cholecystitis without obstruction

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Calculus of bile duct with chronic cholecystitis
  • Calculus of common bile duct with chronic cholecystitis
  • Chronic cholecystitis
  • Chronic cholecystitis due to cholelithiasis co-occurrent with choledocholithiasis
  • Common bile duct calculus

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 and bile duct
        • with
          • cholecystitis
            • chronic

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Chronic Cholecystitis

    cholecystitis that is persistent and long-standing.

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 K80.64 to ICD-9-CMHistory

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

ICD-9-CM
574.70 Gal&bil cal w/oth w/o ob
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 K80.64Overview

Is K80.64 (Calculus of gallbladder and bile duct with cholecystitis) a billable code?

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

What MS-DRG does K80.64 group to?

When calculus of gallbladder and bile duct with chronic 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 K80.64?

Under the General Equivalence Mappings, calculus of gallbladder and bile duct with chronic cholecystitis without obstruction converts to ICD-9-CM 574.70 (gal&bil cal w/oth w/o ob). 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.