ICD-10-CM Code K81.9

Cholecystitis, unspecified

Version 2020 Replaced Code Billable Code

Valid for Submission

K81.9 is a billable code used to specify a medical diagnosis of cholecystitis, unspecified. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code K81.9 might also be used to specify conditions or terms like cholecystitis or cholecystitis without calculus or hyperplastic cholecystitis or xanthogranulomatous cholecystitis.

Short Description:Cholecystitis, unspecified
Long Description:Cholecystitis, unspecified

Replaced Code

This code was replaced in the 2020 ICD-10 code set with the code(s) listed below. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2019. This code was replaced for the FY 2020 (October 1, 2019 - September 30, 2020).

  • K82.A2 - Perforation of gallbladder in cholecystitis

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code K81.9 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Cholecystitis
  • Cholecystitis without calculus
  • Hyperplastic cholecystitis
  • Xanthogranulomatous cholecystitis

Clinical Information

  • CHOLECYSTITIS-. inflammation of the gallbladder; generally caused by impairment of bile flow gallstones in the biliary tract infections or other diseases.
  • CHOLECYSTITIS ACUTE-. acute inflammation of the gallbladder wall. it is characterized by the presence of abdominal pain; fever; and leukocytosis. gallstone obstruction of the cystic duct is present in approximately 90% of the cases.
  • EMPHYSEMATOUS CHOLECYSTITIS-. a variant of acute cholecystitis with inflammation of the gallbladder that is characterized by the pockets of gas in the gallbladder wall. it is due to secondary infection caused by gas forming organisms and has a high risk of perforation.
  • ACALCULOUS CHOLECYSTITIS-. inflammation of the gallbladder wall in the absence of gallstones.

Diagnostic Related Groups

The ICD-10 code K81.9 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.


Convert K81.9 to ICD-9

Code Classification

  • Diseases of the digestive system (K00–K93)
    • Disorders of gallbladder, biliary tract and pancreas (K80-K87)
      • Cholecystitis (K81)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

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.

Your gallbladder is most likely to give you trouble if something blocks the flow of bile through the bile ducts. That is usually a gallstone. Gallstones form when substances in bile harden. Rarely, you can also get cancer in your gallbladder.

Many gallbladder problems get better with removal of the gallbladder. Fortunately, you can live without a gallbladder. Bile has other ways of reaching your small intestine.

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