2026 ICD-10-CM Diagnosis Code K80.51Calculus of bile duct without cholangitis or cholecystitis with obstruction

ICD-10-CM Codes›K00–K95›K80-K87›K80

ICD-10-CM K80.51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K80.51 is a billable ICD-10-CM diagnosis code for calculus of bile duct without cholangitis or cholecystitis with 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
K80.51
Billable Status
Yes — Valid for Submission
Code Describes
Calculus of bile duct without cholangitis or cholecystitis with obstruction
Short Description
Calculus of bile duct w/o cholangitis or cholecyst w obst
Parent Code
K80.5
Calculus of bile duct without cholangitis or cholecystitis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK80Cholelithiasis
This CodeK80.51Calculus of bile duct without cholangitis or cholecystitis with obstruction

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abdominal colic
  • Biliary colic
  • Biliary colic with obstruction
  • Calculus of bile duct with obstruction
  • Calculus of common duct with obstruction
  • Calculus of cystic duct
  • Calculus of cystic duct with obstruction
  • Calculus of hepatic duct
  • Calculus of hepatic duct with obstruction
  • Calculus of pancreas
  • Common bile duct calculus
  • Concretion of intestine
  • Extrahepatic obstructive biliary disease
  • Impacted gallstone of cystic duct
  • Intermittent obstruction of common bile duct caused by gallstone
  • Obstruction of ampulla of Vater by calculus
  • Obstruction of common bile duct
  • Pancreatic duct calculus
  • Pancreatic duct obstruction
  • Pancreatic duct obstruction by 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
      • bile duct (common) (hepatic)
        • with
          • obstruction
    • Obstruction, obstructed, obstructive
      • bile duct or passage (common) (hepatic) (noncalculous)
        • with calculus

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

Gallstones

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.

Convert K80.51 to ICD-9-CMHistory

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

ICD-9-CM
574.51 Choledochlith NOS w obst
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 K80.51Overview

Is K80.51 (Calculus of bile duct without cholangitis or cholecystitis) a billable code?

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

What MS-DRG does K80.51 group to?

When calculus of bile duct without cholangitis or cholecystitis with 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 K80.51?

Under the General Equivalence Mappings, calculus of bile duct without cholangitis or cholecystitis with obstruction converts to ICD-9-CM 574.51 (choledochlith NOS w obst). 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.