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ICD-10-CM 2027 diagnosis code

K80.40Calculus of bile duct with cholecystitis, unspecified, without obstruction

✓ Billable / specificCC — complication/comorbidity

K80.40 is a valid, billable ICD-10-CM code for calculus of bile duct with cholecystitis, unspecified, without obstruction. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Calculus of bile duct w cholecystitis, unsp, w/o obstruction

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K80.40

K80.40 is the ICD-10-CM diagnosis code for calculus of bile duct with cholecystitis, unspecified, without obstruction. It belongs to category K80 (cholelithiasis), block K80-K87 (disorders of gallbladder, biliary tract and pancreas) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within K80.4, choose K80.40 (unspecified, without obstruction) only when documentation doesn't support a more specific option: unspecified, with obstruction (K80.41), acute cholecystitis without obstruction (K80.42), acute cholecystitis with obstruction (K80.43), chronic cholecystitis without obstruction (K80.44), chronic cholecystitis with obstruction (K80.45), acute and chronic cholecystitis without obstruction (K80.46) and acute and chronic cholecystitis with obstruction (K80.47).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" 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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 574.40 (calculus of bile duct with other cholecystitis, without mention of obstruction).

Notes that apply from higher levels

Instructions written at a parent level also apply to K80.40.

› From K80.4 Calculus of bile duct with cholecystitis
Use additional code
  • code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2)
Code also
  • , if applicable, fistula of bile duct (K83.3)
› From K80 Cholelithiasis
Excludes1
  • retained cholelithiasis following cholecystectomy (K91.86)

Broader instructions also apply from Chapter 11: Diseases of the digestive system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to K80.40.

Codes whose notes reference K80.40

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 574.40Calculus of bile duct with other cholecystitis, without mention of obstructionapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about K80.40

Is K80.40 billable?

Yes. K80.40 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can K80.40 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict K80.40 as a principal diagnosis.

Is K80.40 a CC or MCC?

K80.40 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does K80.40 group to?

K80.40 is used in the MS-DRG v44.0 logic for MS-DRG 444 (Disorders of the Biliary Tract with MCC), MS-DRG 445 (Disorders of the Biliary Tract with CC) and MS-DRG 446 (Disorders of the Biliary Tract without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for K80.40?

The CMS General Equivalence Mappings map K80.40 to ICD-9-CM 574.40.