B51 ICD-10-CM Code: Plasmodium vivax malaria
B51 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Protozoal diseases (B50-B64)
B51
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidancePlasmodium vivax malaria
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for B51. Check the code and parent instructions in the Code Book.
Excludes 2
Official- carrier or suspected carrier of infectious disease (Z22.-)Inherited from A00-B99
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)Inherited from A00-B99
- infectious and parasitic diseases specific to the perinatal period (P35-P39)Inherited from A00-B99
- influenza and other acute respiratory infections (J00-J22)Inherited from A00-B99
Related Codes
Includes
Official- mixed infections of Plasmodium vivax with other Plasmodium species, except Plasmodium falciparum
- diseases generally recognized as communicable or transmissibleInherited from A00-B99
Excludes 1
Official- plasmodium vivax with Plasmodium falciparum (B50.-)
- certain localized infections - see body system-related chaptersInherited from A00-B99, B50-B64
- amebiasis (A06.-)Inherited from A00-B99, B50-B64
- other protozoal intestinal diseases (A07.-)Inherited from A00-B99, B50-B64
Code First
OfficialNo Code First sequencing instructions are included in this display for B51. Check the code and parent instructions in the Code Book.
Use Additional
Official- code to identify resistance to antimicrobial drugs (Z16.-)Inherited from A00-B99
Code Also
OfficialNo Code Also instructions are included in this display for B51. Check the code and parent instructions in the Code Book.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- B51
- Description
- Plasmodium vivax malaria
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
B51 is the ICD-10-CM diagnosis code for plasmodium vivax malaria. B51 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering protozoal diseases (b50-b64).
Header codes like B51 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for B51 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Includes
- mixed infections of Plasmodium vivax with other Plasmodium species, except Plasmodium falciparum
Excludes 1, Do NOT code together
- plasmodium vivax with Plasmodium falciparum (B50.-)