Protozoal diseases (B50-B64)
chapter 1: Certain Infectious and Parasitic Diseases
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Instructional notes
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
All codes under B50-B64
B50-B64 can't be used on a claim. Pick a billable code below; grey headings group them.
- B50Plasmodium falciparum malaria
- B50.0Plasmodium falciparum malaria with cerebral complications
- B50.8Other severe and complicated Plasmodium falciparum malaria
- B50.9Plasmodium falciparum malaria, unspecified
- B51Plasmodium vivax malaria
- B51.0Plasmodium vivax malaria with rupture of spleen
- B51.8Plasmodium vivax malaria with other complications
- B51.9Plasmodium vivax malaria without complication
- B52Plasmodium malariae malaria
- B52.0Plasmodium malariae malaria with nephropathy
- B52.8Plasmodium malariae malaria with other complications
- B52.9Plasmodium malariae malaria without complication
- B53Other specified malaria
- B53.0Plasmodium ovale malaria
- B53.1Malaria due to simian plasmodia
- B53.8Other malaria, not elsewhere classified
- B54Unspecified malaria
- B55Leishmaniasis
- B55.0Visceral leishmaniasis
- B55.1Cutaneous leishmaniasis
- B55.2Mucocutaneous leishmaniasis
- B55.9Leishmaniasis, unspecified
- B56African trypanosomiasis
- B56.0Gambiense trypanosomiasis
- B56.1Rhodesiense trypanosomiasis
- B56.9African trypanosomiasis, unspecified
- B57Chagas' disease
- B57.0Acute Chagas' disease with heart involvement
- B57.1Acute Chagas' disease without heart involvement
- B57.2Chagas' disease (chronic) with heart involvement
- B57.3Chagas' disease (chronic) with digestive system involvement
- B57.30Chagas' disease with digestive system involvement, unspecified
- B57.31Megaesophagus in Chagas' disease
- B57.32Megacolon in Chagas' disease
- B57.39Other digestive system involvement in Chagas' disease
- B57.4Chagas' disease (chronic) with nervous system involvement
- B57.40Chagas' disease with nervous system involvement, unspecified
- B57.41Meningitis in Chagas' disease
- B57.42Meningoencephalitis in Chagas' disease
- B57.49Other nervous system involvement in Chagas' disease
- B57.5Chagas' disease (chronic) with other organ involvement
- B58Toxoplasmosis
- B58.0Toxoplasma oculopathy
- B58.00Toxoplasma oculopathy, unspecified
- B58.01Toxoplasma chorioretinitis
- B58.09Other toxoplasma oculopathy
- B58.1Toxoplasma hepatitis
- B58.2Toxoplasma meningoencephalitis
- B58.3Pulmonary toxoplasmosis
- B58.8Toxoplasmosis with other organ involvement
- B58.81Toxoplasma myocarditis
- B58.82Toxoplasma myositis
- B58.83Toxoplasma tubulo-interstitial nephropathy
- B58.89Toxoplasmosis with other organ involvement
- B58.9Toxoplasmosis, unspecified
- B59Pneumocystosis
- B60Other protozoal diseases, not elsewhere classified
- B60.0Babesiosis
- B60.00Babesiosis, unspecified
- B60.01Babesiosis due to Babesia microti
- B60.02Babesiosis due to Babesia duncani
- B60.03Babesiosis due to Babesia divergens
- B60.09Other babesiosis
- B60.1Acanthamebiasis
- B60.10Acanthamebiasis, unspecified
- B60.11Meningoencephalitis due to Acanthamoeba (culbertsoni)
- B60.12Conjunctivitis due to Acanthamoeba
- B60.13Keratoconjunctivitis due to Acanthamoeba
- B60.19Other acanthamebic disease
- B60.2Naegleriasis
- B60.8Other specified protozoal diseases
- B64Unspecified protozoal disease
B50-B64 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
Other codes that refer to B50-B64
Notes on these codes point to B50-B64.
- O98.6 Includes: Conditions in B50-B64
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Malaria
Malaria is a serious disease caused by a parasite. You get it when an infected mosquito bites you. Malaria is a major cause of death worldwide, but it is almost wiped out in the United States. The disease is mostly a problem in developing countries with warm climates. If you travel to these countries, you are at risk. There are four different types of malaria caused by four related parasites. The most deadly type occurs in Africa south of the Sahara Desert.
Read more about malaria on MedlinePlus