Plasmodium vivax malaria (B51) ICD-10-CM
The B51 code range covers plasmodium vivax malaria with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
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.
- plasmodium vivax with Plasmodium falciparum B50
Codes in the B51 Range 4 codes · 3 billable
About the B51 Code Range
The ICD-10 code B51 series is used to identify cases of Plasmodium vivax malaria, a specific type of malaria caused by the Plasmodium vivax parasite. These codes help differentiate whether the infection has complications or occurs without any.
The primary code, B51, covers general Plasmodium vivax malaria. More detailed coding includes B51.0, which specifies cases involving rupture of the spleen, sometimes called "Vivax malaria with rupture of spleen." This highlights a serious hematologic complication. B51.8 is used when other complications arise from the infection, while B51.9 captures uncomplicated cases. Synonyms like "malarial fever," "tertian fever," and "intermittent fever" commonly describe uncomplicated Plasmodium vivax malaria and correspond to this last code. These distinctions are crucial for clinical documentation and billing, ensuring precise identification of the presence and severity of vivax malaria.
Questions About This Page
How many billable codes are in the B51 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the B51 range classify?
The range classifies plasmodium vivax malaria. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
