Loiasis

This code identifies loiasis, a parasitic infection caused by the filarial nematode Loa loa. It is characterized by transient subcutaneous swellings (Calabar swellings) and the migration of adult worms across the conjunctiva of the eye. The infection is transmitted by deer flies (Chrysops species).

Assign this code when documentation confirms a diagnosis of loiasis, typically based on the presence of microfilariae in blood smears, observation of adult worms in the eye, or characteristic Calabar swellings. This code is appropriate for both active infections and sequelae directly attributed to Loa loa.

• Ensure documentation specifies Loa loa as the causative agent to differentiate from other filarial infections.
• Do not confuse with other filarial diseases like onchocerciasis or lymphatic filariasis, which have distinct codes.
• Consider additional codes for specific manifestations or complications, such as ocular involvement, if clearly documented.