ICD-10 Code B50.9 – Plasmodium falciparum malaria, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B50.9 – Plasmodium falciparum malaria, unspecified
What it is
This code identifies malaria caused by Plasmodium falciparum when the record does not specify the clinical form or complication. Use it for confirmed falciparum malaria without further detail.
Clinical signs
Clinical features vary; refer to documentation. Common findings in malaria include fever, chills, headache, malaise, and sometimes anemia or splenomegaly, but you should code only what is documented.
When to use this code
Use B50.9 when the clinician documents Plasmodium falciparum malaria and does not identify it as uncomplicated, cerebral, or another specific type. It also fits when the note confirms falciparum malaria but omits the subtype.
If the chart later specifies a more detailed diagnosis, code the more specific option instead. Check documentation for species confirmation and any stated complications before finalizing the claim.
Do not use for
Do not use this code for malaria caused by another Plasmodium species or for unspecified malaria without falciparum documentation. Also avoid it when a more specific falciparum malaria code is documented.
Coding tip
Confirm the species name in the provider note or lab report before assigning B50.9.