2024 ICD-10-CM Diagnosis Code A07.3

Approximate Synonyms

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
• Coccidiosis co-occurrent with human immunodeficiency virus infection
• Colitis caused by protozoan
• Disease due to Eimeriidae
• Disease due to Eimeriidae
• Disease due to Eimeriidae
• Disease due to Eimeriidae
• Disease due to Eimeriidae
• Disorder of gastrointestinal tract co-occurrent with human immunodeficiency virus infection
• Enteric coccidiosis
• Hepatic coccidiosis
• Human coccidiosis
• Infection by Cystoisospora
• Infection by Cystoisospora
• Infection by Cystoisospora
• Infection by Isospora hominis
• Infection caused by Blastocystis
• Infection caused by Coccidia co-occurrent with acquired immunodeficiency syndrome
• Infection caused by Cystoisospora belli
• Infection caused by Isospora co-occurrent with acquired immunodeficiency syndrome
• Isosporiasis
• 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
• Protozoal enteritis of small intestine
• 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.

• Coccidiosis

  protozoan infection found in animals and man. it is caused by several different genera of coccidia.

• Isospora

  a genus of protozoan parasites found in the intestines of birds, amphibians, reptiles, and mammals, including man. the oocysts produce two sporocysts, each with four sporozoites. many species are parasitic in wild and domestic animals.

• Coccidia

  a subclass of protozoans commonly parasitic in the epithelial cells of the intestinal tract but also found in the liver and other organs. its organisms are found in both vertebrates and higher invertebrates and comprise two orders: eimeriida and eucoccidiida.

• Coccidiosis

  a parasitic infection caused by coccidia. it affects livestock, birds and humans. in humans the parasite infests the intestinal tract and may cause watery diarrhea, abdominal pain, fever, nausea and vomiting.

A07.3 is grouped with Diagnostic Related Groups - MS-DRG Mapping

Diagnostic Related Groups (DRGs) are a classification system used to group together diagnosis codes for the purpose of reimbursement and healthcare management. DRGs are used to standardize the way hospitals and other providers are paid for inpatient services. In this system patients are grouped together based on their principal diagnosis in areas referred to as Major Diagnostic Categories (MDC). Once a patient is assigned a particular diagnostic category, providers receive a predetermined payment rate for the services rendered. This reimbursement rate is often fixed and is meant to cover the cost of care for that patient. Reimbursement is also affected by the relative weight of a diagnostic related group based on the severity of a patient's illness and the associated cost of care during hospitalization.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V41.0 applicable from 10/01/2023 through 09/30/2024.

MS-DRG	MS-DRG Title	MCD	Relative Weight
371	MAJOR GASTROINTESTINAL DISORDERS AND PERITONEAL INFECTIONS WITH MCC	06	1.7477
372	MAJOR GASTROINTESTINAL DISORDERS AND PERITONEAL INFECTIONS WITH CC	06	1.0423
373	MAJOR GASTROINTESTINAL DISORDERS AND PERITONEAL INFECTIONS WITHOUT CC/MCC	06	0.7165

The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Convert A07.3 to ICD-9-CM

• ICD-9-CM Code: 007.2 - Coccidiosis

Patient Education

Gastroenteritis

What is gastroenteritis?

Gastroenteritis is an inflammation of the lining of the stomach and intestines. The main symptoms include vomiting and diarrhea. It is usually not serious in healthy people, but it can sometimes lead to dehydration or cause severe symptoms.

What causes gastroenteritis?

There can be many different causes of gastroenteritis:

• Viruses
• Bacteria
• Parasites
• Chemicals
• Reactions to certain medicines and food

Viral gastroenteritis is the most common type. It can be caused by many different viruses, including noroviruses and rotaviruses. Some people call viral gastroenteritis the "stomach flu." But this name is not medically correct. It is not caused by flu viruses. The flu is a respiratory infection that affects your nose, throat and lungs.

When gastroenteritis is caused by consuming foods or drinks contaminated with viruses, bacteria, parasites, or chemicals, this is called food poisoning.

The viruses, bacteria, and parasites that cause gastroenteritis can also spread from person to person. You could be infected when you touch something that has the germs on it and then touch your eyes, mouth, or nose.

What are the symptoms of gastroenteritis?

The symptoms of gastroenteritis include:

• Diarrhea
• Pain or cramping in your abdomen (belly)
• Nausea
• Vomiting
• Sometimes fever

Gastroenteritis is usually not serious. But it can sometimes cause lead to dehydration or cause severe symptoms. Certain people are at higher risk for these problems. They include:

• Pregnant women
• Older adults
• People with weakened immune systems or other serious health conditions
• Infants
• Babies who were born prematurely or have other health conditions

If you or a family member are at higher risk and have symptoms of gastroenteritis, contact a health care provider right away. Even if you are not at high risk, it is possible to become dehydrated or have more serious symptoms. There are some warning signs to watch for. It's important to contact a provider right away if you or your child have any of them:

• For adults, they include:
  • Change in mental state, such as irritability or lack of energy
  • Diarrhea lasting more than 2 days
  • High fever
  • Vomiting often
  • Six or more loose stools in a day
  • Severe pain in the abdomen (belly) or rectum
  • Stools that are black and tarry or contain blood or pus
  • Symptoms of dehydration, such as thirst, dry mouth, headache, dark-colored urine, and urinating less than normal


• For infants and children, they include:
  • Change in the child's mental state, such as irritability or lack of energy
  • Diarrhea lasting more than a day
  • Any fever in infants
  • High fever in older children
  • Frequent loose stools
  • Vomiting often
  • Severe pain in the abdomen (belly) or rectum
  • Signs or symptoms of dehydration, such as thirst, dry mouth, urinating less than usual or no wet diapers for 3 hours or more, and no tears when crying
  • Stools that are black and tarry or contain blood or pus

How is gastroenteritis diagnosed?

To find out if you have gastroenteritis, your provider:

• Will do a physical exam
• Will ask about your symptoms
• May do tests of your stool

What are the treatments for gastroenteritis?

Usually, people with gastroenteritis get better on their own, with rest and plenty of fluids and electrolytes. Your provider may suggest that you take a probiotic. Studies suggest that some probiotics may help shorten a case of diarrhea.

People with more severe symptoms may need medicines to control nausea or vomiting. Providers may also give other medicines for certain types of gastroenteritis, such as antibiotics for some bacterial types and antiparasitic medicines for some parasitic types.

Can gastroenteritis be prevented?

Gastroenteritis cannot always be prevented. But proper hand washing, cleaning surfaces that may be infected with germs, and safe food preparation may help prevent some of the infections that can cause gastroenteritis. There are vaccines for infants to protect against rotavirus infections.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

[Learn More in MedlinePlus]

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.

[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.