ICD-10-CM Tabular Index · Chapter 1 · FY 2027 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 2027. The section is organized into the 12 code ranges listed below.
✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
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
These parasitic diseases include malaria, leishmaniasis, African trypanosomiasis, Chagas' disease, toxoplasmosis, and pneumocystosis.
Malaria is organized by the named Plasmodium type: B50, B51, and B52 distinguish complications within each type. B53 contains other specified malaria, while B54 is unspecified malaria.
B55 separates forms of leishmaniasis. B56 separates Gambiense and Rhodesiense African trypanosomiasis. B57 distinguishes acute from chronic Chagas' disease and identifies organ involvement. B58 distinguishes toxoplasmosis by the organ involved. B59 identifies pneumocystosis; B60 groups other specified protozoal diseases, and B64 is unspecified protozoal disease.
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 2027. 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.
