Nasopharyngeal myiasis

This code describes the infestation of the nasopharynx by fly larvae (maggots). This parasitic condition, known as myiasis, specifically affects the upper part of the pharynx, behind the nose. The larvae feed on living or necrotic tissue, secretions, or ingested food.

Use this code when documentation clearly indicates the presence of fly larvae within the nasopharyngeal cavity. This diagnosis is typically made through direct visualization during endoscopy or imaging studies. Supporting documentation should detail the location of the infestation as the nasopharynx.

• Ensure the documentation specifies the nasopharynx as the site of myiasis; other sites of myiasis have different codes.
• Do not confuse this with other parasitic infestations or foreign bodies in the nasopharynx.
• Consider sequencing this code as a primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity.