2027 ICD-10-CM Diagnosis Code K82.A2Perforation of gallbladder in cholecystitis

ICD-10-CM Codes›K00–K95›K80-K87›K82

ICD-10-CM K82.A2
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K82.A2 is a billable ICD-10-CM diagnosis code for perforation of gallbladder in cholecystitis. 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 10 closely related codes. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as cholangitis co-occurrent and due to calculus of gallbladder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Biliary tract disease and Gastrointestinal and biliary perforation.

Code Identity

ICD-10-CM Code
K82.A2
Billable Status
Yes — Valid for Submission
Code Describes
Perforation of gallbladder in cholecystitis
Short Description
Perforation of gallbladder in cholecystitis
Same as the full description in the CMS dataset.
Parent Code
K82.A
Disorders of gallbladder in diseases classified elsewhere

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK82Other diseases of gallbladder
This CodeK82.A2Perforation of gallbladder in cholecystitis

Code EditsBilling

Medicare Code Editor checks that affect claim validity for K82.A2.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cholangitis co-occurrent and due to calculus of gallbladder
  • Chronic cholecystitis
  • Chronic cholecystitis with calculus
  • Perforation of biliary tree
  • Perforation of gallbladder
  • Perforation of gallbladder due to chronic cholecystitis with calculus

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K82.A2: its own notes plus those printed at K82.A, K82, 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 K82 Other diseases of gallbladder applies to 9 codes
  • nonvisualization of gallbladder (R93.2)
  • 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 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)

Code First

The underlying condition named in the note is sequenced before this code.

From K82.A Disorders of gallbladder in diseases classified elsewhere applies to 2 codes

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name K82.A2, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming K82.A2: they are not reported together with it, unless the two conditions are unrelated.

  • K82.2 Perforation of gallbladder
    Perforation of gallbladder in cholecystitis (K82.A2)

Excludes2 2

These codes carry an Excludes2 note naming K82.A2: its condition is not part of those codes, and both may be reported when the patient has both.

  • K83 Other diseases of biliary tract
    conditions involving the gallbladder (K81-K82) names K81-K82, which includes this code
  • K83 Other diseases of biliary tract
    conditions involving the cystic duct (K81-K82) names K81-K82, which includes this code

Use Additional Code 5

These codes say to use an additional code from the note, and K82.A2 is one of the codes named.

  • K80.0 Calculus of gallbladder with acute cholecystitis
    code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2)
  • K80.1 Calculus of gallbladder with other cholecystitis
    code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2)
  • K80.4 Calculus of bile duct with cholecystitis
    code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2)
  • K80.6 Calculus of gallbladder and bile duct with cholecystitis
    code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2)
  • K81 Cholecystitis
    code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2)

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 No · outpatient No
CCSR DIG006
Gastrointestinal and biliary perforation
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Gallbladder Diseases

Your gallbladder is a pear-shaped organ under your liver. It stores bile, a fluid made by your liver to digest fat. As your stomach and intestines digest food, your gallbladder releases bile through a tube called the common bile duct. The duct connects your gallbladder and liver to your small intestine.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement K82.A2 replaces the following previously assigned code(s):

  • K81.9 - Cholecystitis, unspecified
  • K82.2 - Perforation of gallbladder
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K82.A2Overview

What is the ICD-10 code for perforation of gallbladder in cholecystitis?

The ICD-10-CM code for perforation of gallbladder in cholecystitis is K82.A2 (sometimes written as K82A2). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is K82.A2 (Disorders of gallbladder in diseases classified elsewhere) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report perforation of gallbladder in cholecystitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does K82.A2 group to?

On inpatient claims, perforation of gallbladder in cholecystitis maps to MS-DRG 444, 445, 446, with relative weights from 0.8121 to 1.6662 depending on complications. Higher weights mean higher Medicare reimbursement.

Is K82.A2 a CC or MCC?

CMS lists K82.A2 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 10 closely related codes in its exclusion list.

Can K82.A2 be a principal diagnosis?

No. This is a manifestation code: perforation of gallbladder in cholecystitis describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.