2026 ICD-10-CM Diagnosis Code B51Plasmodium vivax malaria

ICD-10-CM Codes›A00–B99›B50-B64›B51

ICD-10-CM B51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B51 is a non-billable ICD-10-CM category code for plasmodium vivax malaria, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B51.0, B51.8, and B51.9.

Code Identity

ICD-10-CM Code
B51
Billable Status
No — Non-Billable Category
Code Describes
Plasmodium vivax malaria
Short Description
Plasmodium vivax malaria
Same as the full description in the CMS dataset.
Chapter
B50-B64
Protozoal diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB50-B64Protozoal diseases
CategoryB51Plasmodium vivax malaria
This CodeB51Plasmodium vivax malaria

Specific Coding for Plasmodium vivax malariaOverview

Non-specific codes like B51 require more characters. Use one of these billable codes instead:

  • Use B51.0 for Plasmodium vivax malaria with rupture of spleen

  • Use B51.8 for Plasmodium vivax malaria with other complications

  • Use B51.9 for Plasmodium vivax malaria without complication

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • mixed infections of Plasmodium vivax with other Plasmodium species, except Plasmodium falciparum

Type 1 Excludes

  • plasmodium vivax with Plasmodium falciparum B50

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B51Overview

Is B51 (Plasmodium vivax malaria) a billable code?

No. This is a category header that groups the codes for plasmodium vivax malaria, and headers cannot be submitted on claims. Claims for plasmodium vivax malaria need a more specific code from this category, such as B51.0, B51.8, and B51.9.