ICD-10 Code B87.3 – Nasopharyngeal Myiasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B87.3 – Nasopharyngeal myiasis
What it is
Nasopharyngeal myiasis is infestation of the nasopharynx by fly larvae. Use this code when documentation identifies maggots or larvae in the nose, nasopharynx, or adjacent upper airway.
Clinical signs
Clinical features vary; refer to documentation. Typical notes may mention nasal obstruction, foul-smelling discharge, visible larvae, irritation, bleeding, or discomfort in the upper airway.
When to use this code
Use B87.3 when the provider documents nasopharyngeal myiasis, nasal maggot infestation, or larvae in the nasopharynx. It fits confirmed parasitic infestation, not a nonspecific nasal infection. If the record only says “foreign body” or “nasal discharge,” check documentation.
Do not use for
Do not use this code for intestinal, wound, or ocular myiasis, which are coded elsewhere. Also avoid it when larvae are suspected but not documented as nasopharyngeal.
Coding tip
Code the site exactly as documented; if the note says only “myiasis,” verify whether the nasopharynx is specified.