2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K83.5 is a billable ICD-10-CM diagnosis code for biliary cyst. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K83.5: its own notes plus those printed at K83 and Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From K83 Other diseases of biliary tract applies to 9 codes
  • postcholecystectomy syndrome (K91.5)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From K83 Other diseases of biliary tract applies to 9 codes
  • conditions involving the gallbladder (K81-K82)
  • conditions involving the cystic duct (K81-K82)
From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

  • Biliary Cyst

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

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K83.5Overview

What is the ICD-10 code for biliary cyst?

The ICD-10-CM code for biliary cyst is K83.5 (sometimes written as K835). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 0.8121 to 1.6662 depending on complications. Higher weights mean higher Medicare reimbursement.

Can K83.5 be reported with K91.5?

Not as a rule. The Excludes1 note at K83, which applies to K83.5, lists "postcholecystectomy syndrome (K91.5)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

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.