ICD-10-CM 2027
ICD-10 code for common duct acquired dilatation
From the official ICD-10-CM alphabetic index entry “Dilatation › common duct (acquired)”. Page updated September 29, 2026.
About coding common duct acquired dilatation
The ICD-10-CM code for common duct acquired dilatation is K83.8 (Other specified diseases of biliary tract). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on K83.8.
Within K83, choose K83.8 (Other specified diseases of biliary tract) only when documentation doesn't support a more specific option: cholangitis (K83.0), obstruction of bile duct (K83.1), perforation of bile duct (K83.2), fistula of bile duct (K83.3), spasm of sphincter of Oddi (K83.4), biliary cyst (K83.5) and disease of biliary tract, unspecified (K83.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 444 (Disorders of the Biliary Tract with MCC, relative weight 1.6665), DRG 445 (Disorders of the Biliary Tract with CC, relative weight 1.0872) and DRG 446 (Disorders of the Biliary Tract without CC/MCC, relative weight 0.8124), in MDC 07 (Diseases and Disorders of the Hepatobiliary System and Pancreas), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific common duct acquired dilatation codes (official index)
- congenital Q44.5 — Other congenital malformations of bile ducts
Common questions about common duct acquired dilatation ICD-10 codes
What is the ICD-10 code for common duct acquired dilatation?
- K83.8 — Other specified diseases of biliary tract. More specific codes apply when the documentation supports them: Q44.5.
What is the ICD-10 code for congenital common duct acquired dilatation?
- Q44.5 — Other congenital malformations of bile ducts.
Is K83.8 billable?
- Yes. K83.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K83.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K83.8 as a principal diagnosis.
Is K83.8 a CC or MCC?
- No. K83.8 is neither a CC nor an MCC under MS-DRG v44.0.