2026 ICD-10-CM Diagnosis Code K83.5Biliary cyst

ICD-10-CM Codes›K00–K95›K80-K87›K83

ICD-10-CM K83.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K83.5 is a billable ICD-10-CM diagnosis code for biliary cyst. 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 acquired choledochal cyst. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Biliary tract disease.

Code Identity

ICD-10-CM Code
K83.5
Billable Status
Yes — Valid for Submission
Code Describes
Biliary cyst
Short Description
Biliary cyst
Same as the full description in the CMS dataset.
Parent Code
K83
Other diseases of biliary tract

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK83Other diseases of biliary tract
This CodeK83.5Biliary cyst

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired choledochal cyst
  • Acquired cystic dilatation of common bile duct
  • Acquired dilation of bile duct
  • Choledochal cyst
  • Cyst of bile duct
  • Cyst of biliary tract
  • Cyst of intrahepatic bile ducts
  • Cystic dilatation of common bile duct
  • Liver cyst

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.

    • Cyst(colloid) (mucous) (simple) (retention)
      • bile duct (common) (hepatic)
    • Cyst(colloid) (mucous) (simple) (retention)
      • common (bile) duct

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

  • Choledochal Cyst

    a congenital anatomic malformation of a bile duct, including cystic dilatation of the extrahepatic bile duct or the large intrahepatic bile duct. classification is based on the site and type of dilatation. type i is most common.

  • Bile Duct Mucinous Cystic Neoplasm with an Associated Invasive Carcinoma|Bile Duct Cystadenocarcinoma|Bile Duct MCN with an Associated Invasive Carcinoma|Bile duct cystadenocarcinoma|Biliary Cystadenocarcinoma|Cystadenocarcinoma of Bile Duct|Cystadenocarcinoma of the Bile Duct

    a mucinous cystic neoplasm that arises from the intrahepatic or extrahepatic bile ducts and it is associated with an invasive carcinomatous component.

  • Biliary Cyst

    a cystic dilatation that occurs in any part of the biliary tree.

  • Choledochal Cyst

    cystic dilatation of the hepatic duct or bile duct.

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 K83.5 to ICD-9-CMHistory

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

ICD-9-CM
576.8 Dis of biliary tract 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 K83.5Overview

Is K83.5 (Other diseases of biliary tract) a billable code?

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

What MS-DRG does K83.5 group to?

When biliary cyst 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 K83.5?

Under the General Equivalence Mappings, biliary cyst converts to ICD-9-CM 576.8 (dis of biliary tract NEC). 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.