ICD-10-CM Tabular Index · Chapter 1 · FY 2026 B50–B64
Protozoal diseases (B50-B64) ICD-10-CM
The B50–B64 section covers protozoal diseases with 72 ICD-10-CM diagnosis codes, of which 57 are billable in fiscal year 2026. The section is organized into the 12 code ranges listed below.
✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
12
Code Ranges
72
Diagnosis Codes
57
Billable Codes
B50–B64
Code Range
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.
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the B50–B64 Code Range
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.
Questions About This Page
How many codes are in the B50-B64 range?
The B50-B64 range contains 72 ICD-10-CM diagnosis codes in FY 2026. 57 of them are billable, and the rest are category headers that organize the section.
What conditions does B50-B64 cover?
The range covers protozoal diseases. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
mixed infections of Plasmodium vivax with other Plasmodium species, except Plasmodium falciparum
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.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
mixed infections of Plasmodium malariae with other Plasmodium species, except Plasmodium falciparum and Plasmodium vivax
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.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
infection due to Toxoplasma gondii
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.
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.
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.
