2024 ICD-10-CM Diagnosis Code K81.9

Cholecystitis, unspecified

ICD-10-CM Code:
ICD-10 Code for:
Cholecystitis, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Diseases of the digestive system
    • Disorders of gallbladder, biliary tract and pancreas
      • Cholecystitis

K81.9 is a billable diagnosis code used to specify a medical diagnosis of cholecystitis, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like K81.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

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 Classification

Clinical Information

  • Acalculous Cholecystitis

    inflammation of the gallbladder wall in the absence of gallstones.
  • 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.
  • Gallbladder

    a storage reservoir for bile secretion. gallbladder allows the delivery of bile acids at a high concentration and in a controlled manner, via the cystic duct to the duodenum, for degradation of dietary lipid.
  • Acalculous Cholecystitis

    inflammation of the gallbladder in the absence of gallstones.
  • Acute Acalculous Cholecystitis

    acute inflammation of the gallbladder in the absence of gallstones
  • Acute Cholecystitis

    acute inflammation of the gallbladder.
  • Cholecystitis

    an acute or chronic inflammation involving the gallbladder wall. it may be associated with the presence of gallstones.
  • Cholecystitis with Cholelithiasis

    an acute or chronic inflammation of the gallbladder associated with the presence of gallstones.
  • Cholecystitis, CTCAE 5.0|Cholecystitis|Cholecystitis

    a disorder characterized by inflammation involving the gallbladder. it may be associated with the presence of gallstones.
  • Chronic Acalculous Cholecystitis

    chronic cholecystitis not associated with the presence of gallstones.
  • Chronic Cholecystitis

    cholecystitis that is persistent and long-standing.
  • Emphysematous Cholecystitis

    cholecystitis resulting from infection by gas producing organisms.
  • Grade 2 Cholecystitis, CTCAE|Grade 2 Cholecystitis|Grade 2 Cholecystitis

    symptomatic; medical intervention indicated
  • Grade 3 Cholecystitis, CTCAE|Grade 3 Cholecystitis|Grade 3 Cholecystitis

    severe symptoms; invasive intervention indicated
  • Grade 4 Cholecystitis, CTCAE|Grade 4 Cholecystitis|Grade 4 Cholecystitis

    life-threatening consequences; urgent operative intervention indicated
  • Grade 5 Cholecystitis, CTCAE|Grade 5 Cholecystitis|Grade 5 Cholecystitis

  • Xanthogranulomatous Cholecystitis

    cholecystitis that is characterized by nodules containing lipid.

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert K81.9 to ICD-9-CM

  • ICD-9-CM Code: 575.10 - Cholecystitis NOS

Patient Education

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.

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.


[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.