B51.9 Plasmodium vivax malaria without complication

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Plasmodium vivax malaria NOS

Applies from B51 Plasmodium vivax malaria

Includes

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

Excludes1 (never code together)

• plasmodium vivax with Plasmodium falciparum (B50.-)

MS-DRG index

Defines the logic of DRG(s) 867-869 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 084.1 Vivax malaria [benign tertian] (approximate)
• 084.5 Mixed malaria (approximate)

Code annotations containing back-references to B51.9

Back-references to B51

• Type 1 Excludes: B52 Plasmodium malariae malaria ("Plasmodium vivax (B51.-)")
• Type 1 Excludes: B53.0 Plasmodium ovale malaria ("Plasmodium ovale with Plasmodium vivax (B51.-)")
• Type 1 Excludes: B53.1 Malaria due to simian plasmodia ("Malaria due to simian plasmodia with Plasmodium vivax (B51.-)")
• Type 2 Excludes: J82 Pulmonary eosinophilia, not elsewhere classified ("pulmonary eosinophilia due to specified parasitic infection (B50-B83)")

Diagnosis Index entries for B51.9

• Malaria, malarial (fever) › Plasmodium (P.) › vivax NEC
• Malaria, malarial (fever) › vivax

Nearby codes

• B51 Plasmodium vivax malaria
• B51.0 Plasmodium vivax malaria with rupture of spleen
• B51.8 Plasmodium vivax malaria with other complications
• B51.9 Plasmodium vivax malaria without complication (this code)