Protozoal diseases (B50-B64)

ICD-10 codes B50-B64 are used to classify diseases caused by protozoan parasites, including various forms of malaria, leishmaniasis, African trypanosomiasis, Chagas' disease, toxoplasmosis, pneumocystosis, babesiosis, and other less common protozoal infections. These codes help specify the particular protozoal infection and any related complications.

This range covers several types of malaria such as B50 for Plasmodium falciparum malaria; including cerebral malaria (B50.0) and other severe complications (B50.8); and other malaria species like Plasmodium vivax (B51) and Plasmodium malariae (B52), each with further subcodes for complications. Leishmaniasis codes (B55) cover visceral, cutaneous, and mucocutaneous forms. African trypanosomiasis (sleeping sickness) is coded under B56, differentiating Gambiense (B56.0) and Rhodesiense (B56.1) infections. Chagas' disease (B57) includes acute and chronic forms with involvement of the heart, digestive system, or nervous system. Toxoplasmosis (B58) captures eye infections, encephalitis, hepatitis, and other organ involvement. Pneumocystosis (B59) refers mainly to lung infections by Pneumocystis jirovecii. The codes also include less common protozoal infections like babesiosis (B60.0), Acanthamebiasis (B60.1), and Naegleriasis (B60.2). Use of synonyms such as "cerebral malaria," "visceral leishmaniasis," or "acute Chagas' disease" can guide precise coding decisions.

Plasmodium falciparum malaria (B50)
Plasmodium vivax malaria (B51)
Plasmodium malariae malaria (B52)
Other specified malaria (B53)
Unspecified malaria (B54)
Leishmaniasis (B55)
African trypanosomiasis (B56)
Chagas' disease (B57)
Toxoplasmosis (B58)
Pneumocystosis (B59)
Other protozoal diseases, not elsewhere classified (B60)
Unspecified protozoal disease (B64)

Filter diagnosis codes list:

Certain infectious and parasitic diseases (A00–B99)
- Protozoal diseases (B50-B64)
  - - B50 Plasmodium falciparum malaria
    - B50.0 Plasmodium falciparum malaria with cerebral complications
    - B50.8 Other severe and complicated Plasmodium falciparum malaria
    - B50.9 Plasmodium falciparum malaria, unspecified
  - - B51 Plasmodium vivax malaria
    - B51.0 Plasmodium vivax malaria with rupture of spleen
    - B51.8 Plasmodium vivax malaria with other complications
    - B51.9 Plasmodium vivax malaria without complication
  - - B52 Plasmodium malariae malaria
    - B52.0 Plasmodium malariae malaria with nephropathy
    - B52.8 Plasmodium malariae malaria with other complications
    - B52.9 Plasmodium malariae malaria without complication
  - - B53 Other specified malaria
    - B53.0 Plasmodium ovale malaria
    - B53.1 Malaria due to simian plasmodia
    - B53.8 Other malaria, not elsewhere classified
  - - B54 Unspecified malaria
  - - B55 Leishmaniasis
    - B55.0 Visceral leishmaniasis
    - B55.1 Cutaneous leishmaniasis
    - B55.2 Mucocutaneous leishmaniasis
    - B55.9 Leishmaniasis, unspecified
  - - B56 African trypanosomiasis
    - B56.0 Gambiense trypanosomiasis
    - B56.1 Rhodesiense trypanosomiasis
    - B56.9 African trypanosomiasis, unspecified
  - - B57 Chagas' disease
    - B57.0 Acute Chagas' disease with heart involvement
    - B57.1 Acute Chagas' disease without heart involvement
    - B57.2 Chagas' disease (chronic) with heart involvement
    - B57.3 Chagas' disease (chronic) with digestive system involvement
    - B57.30 Chagas' disease with digestive system involvement, unspecified
    - B57.31 Megaesophagus in Chagas' disease
    - B57.32 Megacolon in Chagas' disease
    - B57.39 Other digestive system involvement in Chagas' disease
    - B57.4 Chagas' disease (chronic) with nervous system involvement
    - B57.40 Chagas' disease with nervous system involvement, unspecified
    - B57.41 Meningitis in Chagas' disease
    - B57.42 Meningoencephalitis in Chagas' disease
    - B57.49 Other nervous system involvement in Chagas' disease
    - B57.5 Chagas' disease (chronic) with other organ involvement
  - - B58 Toxoplasmosis
    - B58.0 Toxoplasma oculopathy
    - B58.00 Toxoplasma oculopathy, unspecified
    - B58.01 Toxoplasma chorioretinitis
    - B58.09 Other toxoplasma oculopathy
    - B58.1 Toxoplasma hepatitis
    - B58.2 Toxoplasma meningoencephalitis
    - B58.3 Pulmonary toxoplasmosis
    - B58.8 Toxoplasmosis with other organ involvement
    - B58.81 Toxoplasma myocarditis
    - B58.82 Toxoplasma myositis
    - B58.83 Toxoplasma tubulo-interstitial nephropathy
    - B58.89 Toxoplasmosis with other organ involvement
    - B58.9 Toxoplasmosis, unspecified
  - - B59 Pneumocystosis
  - - B60 Other protozoal diseases, not elsewhere classified
    - B60.0 Babesiosis
    - B60.00 Babesiosis, unspecified
    - B60.01 Babesiosis due to Babesia microti
    - B60.02 Babesiosis due to Babesia duncani
    - B60.03 Babesiosis due to Babesia divergens
    - B60.09 Other babesiosis
    - B60.1 Acanthamebiasis
    - B60.10 Acanthamebiasis, unspecified
    - B60.11 Meningoencephalitis due to Acanthamoeba (culbertsoni)
    - B60.12 Conjunctivitis due to Acanthamoeba
    - B60.13 Keratoconjunctivitis due to Acanthamoeba
    - B60.19 Other acanthamebic disease
    - B60.2 Naegleriasis
    - B60.8 Other specified protozoal diseases
  - - B64 Unspecified protozoal disease

Instructional Notations

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

amebiasis A06
other protozoal intestinal diseases A07

Table of Contents

Certain infectious and parasitic diseases (A00–B99)