ICD-10 Code B74.3 – Loiasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B74.3 – Loiasis
What it is
B74.3 identifies loiasis, a filarial parasitic infection caused by Loa loa. Use it when the record documents this specific infestation, not other helminth infections.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include episodic angioedema, pruritus, and migration of the adult worm across the eye or under the skin.
When to use this code
Use B74.3 when the clinician diagnoses loiasis or records Loa loa infection. It also applies when the note describes Congo or African eye worm disease with supporting documentation.
If the chart only mentions a suspected parasitic infection, do not code B74.3 unless the diagnosis is confirmed. Check documentation for the organism and site details.
Do not use for
Do not assign this code for nonspecific pruritus, eosinophilia, or other filarial diseases without documented loiasis. Avoid using it for travel exposure alone.
Coding tip
Confirm the organism name “Loa loa” or “loiasis” in the assessment before coding B74.3.