ICD-10-CM Code K35.3

Acute appendicitis with localized peritonitis

Version 2020 Replaced Code Non-Billable Code

Not Valid for Submission

K35.3 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of acute appendicitis with localized peritonitis. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:K35.3
Short Description:Acute appendicitis with localized peritonitis
Long Description:Acute appendicitis with localized peritonitis

Consider the following ICD-10 codes with a higher level of specificity:

  • K35.30 - Acute appendicitis with localized peritonitis, without perforation or gangrene
  • K35.31 - Acute appendicitis with localized peritonitis and gangrene, without perforation
  • K35.32 - Acute appendicitis with perforation and localized peritonitis, without abscess
  • K35.33 - Acute appendicitis with perforation and localized peritonitis, with abscess

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).

  • K35.30 - Acute appendicitis with loc peritonitis, w/o perf or gangr
  • K35.31 - Acute appendicitis with loc peritonitis and gangr, w/o perf
  • K35.32 - Acute appendicitis with perf and loc peritonitis, w/o abscs
  • K35.33 - Acute appendicitis with perf and loc peritonitis, with abscs

Convert K35.3 to ICD-9

  • 540.1 - Abscess of appendix (Approximate Flag)

Code Classification

  • Diseases of the digestive system (K00–K93)
    • Diseases of appendix (K35-K38)
      • Acute appendicitis (K35)

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 - Code Deleted, 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


Appendicitis

The appendix is a small, tube-like organ attached to the first part of the large intestine. It is located in the lower right part of the abdomen. It has no known function. A blockage inside of the appendix causes appendicitis. The blockage leads to increased pressure, problems with blood flow, and inflammation. If the blockage is not treated, the appendix can burst and spread infection into the abdomen. This causes a condition called peritonitis.

The main symptom is pain in the abdomen, often on the right side. It is usually sudden and gets worse over time. Other symptoms may include

  • Swelling in the abdomen
  • Loss of appetite
  • Nausea and vomiting
  • Constipation or diarrhea
  • Inability to pass gas
  • Low fever

Not everyone with appendicitis has all these symptoms.

Appendicitis is a medical emergency. Treatment almost always involves removing the appendix. Anyone can get appendicitis, but it is more common among people 10 to 30 years old.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases


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Peritoneal Disorders

Your peritoneum is the tissue that lines your abdominal wall and covers most of the organs in your abdomen. A liquid, peritoneal fluid, lubricates the surface of this tissue.

Disorders of the peritoneum are not common. They include

  • Peritonitis - an inflammation of the peritoneum
  • Cancer
  • Complications from peritoneal dialysis

Your doctor may use imaging tests or lab tests to analyze the peritoneal fluid to diagnose the problem. Treatment of peritoneal disorders depends on the cause.


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