ICD-10-CM 2027
ICD-10 code for cystic duct infection
From the official ICD-10-CM alphabetic index entry “Infection, infected, infective (opportunistic) › cystic duct”. Page updated September 29, 2026.
About coding cystic duct infection
The ICD-10-CM code for cystic duct infection is K81.9 (Cholecystitis, unspecified).
Within K81, choose K81.9 (unspecified) only when documentation doesn't support a more specific option: acute cholecystitis (K81.0), chronic cholecystitis (K81.1) and acute cholecystitis with chronic cholecystitis (K81.2).
Use an additional code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about cystic duct infection ICD-10 codes
What is the ICD-10 code for cystic duct infection?
- K81.9 — Cholecystitis, unspecified.
Is K81.9 billable?
- Yes. K81.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K81.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K81.9 as a principal diagnosis.
Is K81.9 a CC or MCC?
- No. K81.9 is neither a CC nor an MCC under MS-DRG v44.0.