ICD-10-CM 2027
ICD-10 code for bile duct impervious
From the official ICD-10-CM alphabetic index entry “Impervious (congenital) › bile duct”. Page updated September 29, 2026.
About coding bile duct impervious
The ICD-10-CM code for bile duct impervious is Q44.2 (Atresia of bile ducts).
Within Q44 (congenital malformations of gallbladder, bile ducts and liver), Q44.2 is specifically for atresia of bile ducts. Related codes cover agenesis, aplasia and hypoplasia of gallbladder (Q44.0), other congenital malformations of gallbladder (Q44.1), congenital stenosis and stricture of bile ducts (Q44.3), Choledochal cyst (Q44.4), other congenital malformations of bile ducts (Q44.5), cystic disease of liver (Q44.6) and other congenital malformations of liver (Q44.7).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
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.
Common questions about bile duct impervious ICD-10 codes
What is the ICD-10 code for bile duct impervious?
- Q44.2 — Atresia of bile ducts.
Is Q44.2 billable?
- Yes. Q44.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q44.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q44.2 as a principal diagnosis.
Is Q44.2 a CC or MCC?
- Q44.2 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.