ICD-10 Code B74.1 – Filariasis due to Brugia malayi (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B74.1 – Filariasis due to Brugia malayi
What it is
B74.1 identifies filariasis caused by Brugia malayi, a parasitic infection transmitted by mosquitoes. It is used when documentation specifies this organism or a Brugia malayi infection.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include lymphatic swelling, recurrent fever, and inflammatory episodes affecting the limbs or genital region.
When to use this code
Use this code when the provider documents filariasis due to Brugia malayi, Brugia malayi infection, or Brugia malayi lymphatic disease. Code it from confirmed diagnosis or clear clinical documentation linking the parasite to the illness. Check documentation if the organism is not named.
Do not use for
Do not use B74.1 for filariasis caused by other parasites, such as Wuchereria bancrofti, or when the record only says “filariasis” without a specified organism. Check documentation.
Coding tip
Confirm the causative species before coding; unspecified filariasis may require a different code.