ICD-10 Code B74 – Filariasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B74 – Filariasis
What it is
B74 identifies filariasis, a parasitic infection caused by filarial worms. It is used when the record documents this diagnosis without needing a more specific subtype.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings may include lymphatic swelling, recurrent inflammation, or evidence of worm infection on clinical evaluation.
When to use this code
Use B74 when the provider documents filariasis and does not specify a more detailed category. Code it for confirmed infection, suspected cases that are later documented as filariasis, or follow-up encounters tied to the diagnosis. Check documentation for the exact form and site.
Do not use for
Do not use B74 for nonspecific swelling, tropical disease exposure, or other parasitic infections without documented filariasis. If the chart names a different organism or a more specific filarial condition, code that instead.
Coding tip
Review the note for the exact filarial type before assigning B74, because a more specific code may apply.