ICD-10-CM Code A07.3


Version 2020 Billable Code

Valid for Submission

A07.3 is a billable code used to specify a medical diagnosis of isosporiasis. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code A07.3 might also be used to specify conditions or terms like blastocystis hominis infection, chronic intestinal isosporiasis, coccidiosis, coccidiosis co-occurrent with human immunodeficiency virus infection, coccidiosis co-occurrent with human immunodeficiency virus infection, colitis caused by protozoan, etc

Short Description:Isosporiasis
Long Description:Isosporiasis

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code A07.3:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Infection due to Isospora belli and Isospora hominis
  • Intestinal coccidiosis
  • Isosporosis

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 A07.3 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:

  • Blastocystis hominis infection
  • Chronic intestinal isosporiasis
  • Coccidiosis
  • Coccidiosis co-occurrent with human immunodeficiency virus infection
  • Coccidiosis co-occurrent with human immunodeficiency virus infection
  • Colitis caused by protozoan
  • Disorder of gastrointestinal tract co-occurrent with human immunodeficiency virus infection
  • Enteric coccidiosis
  • Enteritis caused by protozoan
  • Hepatic coccidiosis
  • Human coccidiosis
  • Infection by Isospora belli
  • Infection by Isospora hominis
  • Infection caused by Blastocystis
  • Infection caused by Coccidia co-occurrent with acquired immunodeficiency syndrome
  • Infection caused by Isospora co-occurrent with acquired immunodeficiency syndrome
  • Isosporiasis
  • Isosporiasis co-occurrent with human immunodeficiency virus infection
  • Parasitic infection causing colitis
  • Parasitic infection causing inflammation of small intestine
  • Parasitic infection of colon caused by Cystoisospora belli
  • Parasitic infection of small intestine caused by Cystoisospora belli
  • Renal coccidiosis

Clinical Information

  • ISOSPORIASIS-. infection with parasitic protozoa of the genus isospora producing intestinal disease. it is caused by ingestion of oocysts and can produce tissue cysts.

Diagnostic Related Groups

The ICD-10 code A07.3 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 10/01/2020 through 09/30/2020.


Convert A07.3 to ICD-9

Code Classification

  • Certain infectious and parasitic diseases (A00–B99)
    • Intestinal infectious diseases (A00-A09)
      • Other protozoal intestinal diseases (A07)

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


Have you ever had the "stomach flu?" What you probably had was gastroenteritis - not a type of flu at all. Gastroenteritis is an inflammation of the lining of the intestines caused by a virus, bacteria, or parasites. Viral gastroenteritis is the second most common illness in the U.S. The cause is often a norovirus infection. It spreads through contaminated food or water or by contact with an infected person. The best prevention is frequent hand washing.

Symptoms of gastroenteritis include diarrhea, abdominal pain, vomiting, headache, fever, and chills. Most people recover with no treatment.

The most common problem with gastroenteritis is dehydration. This happens if you do not drink enough fluids to replace what you lose through vomiting and diarrhea. Dehydration is most common in babies, young children, older adults, and people with weak immune systems.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

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Parasitic Diseases

Parasites are living things that use other living things - like your body - for food and a place to live. You can get them from contaminated food or water, a bug bite, or sexual contact. Some parasitic diseases are easily treated and some are not.

Parasites range in size from tiny, one-celled organisms called protozoa to worms that can be seen with the naked eye. Some parasitic diseases occur in the United States. Contaminated water supplies can lead to Giardia infections. Cats can transmit toxoplasmosis, which is dangerous for pregnant women. Others, like malaria, are common in other parts of the world.

If you are traveling, it's important to drink only water you know is safe. Prevention is especially important. There are no vaccines for parasitic diseases. Some medicines are available to treat parasitic infections.

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