ICD-10 Code B51.8 – Plasmodium vivax malaria with other complications (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B51.8 – Plasmodium vivax malaria with other complications
What it is
This code identifies malaria caused by Plasmodium vivax when the record documents complications not captured by a more specific B51 code. Use it for vivax malaria with an additional complication, but check documentation for the exact manifestation.
Clinical signs
Clinical features vary; refer to documentation. Typical malaria findings may include fever, chills, sweats, headache, and malaise, with evidence that the infection is due to P. vivax and accompanied by another complication.
When to use this code
Use B51.8 when the provider states Plasmodium vivax malaria and also documents a complication that is not separately specified in the code set. This may include a charted complication linked to the malaria episode, but not one that fits a more specific subcategory. If the record is unclear, verify the complication before coding.
Do not use for
Do not use this code for malaria caused by another Plasmodium species, uncomplicated P. vivax malaria, or a more specific B51 code that matches the documented complication. Check documentation if the species or complication is uncertain.
Coding tip
Confirm both the Plasmodium vivax species and the accompanying complication in the provider note before assigning B51.8.