Is B51 a billable ICD-10-CM code?

No. B51 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does B51 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Protozoal diseases (B50-B64).

What cannot be coded together with B51?

B51 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

B51

B51 — Plasmodium vivax malaria

Non-billable headerICD-10-CM

B51 is a non-billable header ICD-10-CM code for plasmodium vivax malaria. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

plasmodium vivax with Plasmodium falciparum (B50.-)

Includes

Conditions this code covers.

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

Other codes that can never be billed with B51

These codes carry an Excludes1 note pointing at B51. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading B51 alone.

B52Plasmodium malariae malaria
B53.0Plasmodium ovale malaria
B53.1Malaria due to simian plasmodia
D73.5Infarction of spleen
D77Other disorders of blood and blood-forming organs in diseases classified elsewhere

Risk adjustment

B51 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead B51

3 child codes. Green means billable.

Questions about B51

Is B51 a billable ICD-10-CM code?: No. B51 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does B51 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Protozoal diseases (B50-B64).
What cannot be coded together with B51?: B51 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.