B51 – Plasmodium vivax malaria

ICD-10-CM 2027 diagnosis code · Protozoal diseases

Non-billable header

ICD-10-CM code B51
Code
B51 (claims format: B51)
Description
Plasmodium vivax malaria
Billable
No – use a more specific code below
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
1. Certain infectious and parasitic diseases (A00-B99)
Block
B50-B64 Protozoal diseases

Billable codes under B51

B51 is a header code and cannot be used on claims. Choose the most specific code:

Notes for B51

Includes:
  • mixed infections of Plasmodium vivax with other Plasmodium species, except Plasmodium falciparum
Excludes1 (not coded here):
  • plasmodium vivax with Plasmodium falciparum (B50.-)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block B50-B64

Excludes1 (not coded here):
  • amebiasis (A06.-)
  • other protozoal intestinal diseases (A07.-)

Frequently asked questions

What is ICD-10 code B51?

B51 is the ICD-10-CM code for plasmodium vivax malaria, in the block B50-B64 (Protozoal diseases).

Is B51 a billable code?

No. B51 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.