Gnathostomiasis

This code represents an infection caused by nematodes of the genus Gnathostoma. Humans acquire this parasitic infection by consuming raw or undercooked freshwater fish, eels, frogs, or poultry containing infective larvae. The larvae migrate through tissues, causing various clinical manifestations depending on the affected organ system.

Use this code when documentation confirms a diagnosis of gnathostomiasis, typically through identification of larvae in tissue biopsies, serological tests, or characteristic migratory skin lesions. This code is appropriate for all forms of the disease, including cutaneous, visceral, ocular, and central nervous system involvement.

• Ensure documentation specifies the parasitic etiology to differentiate from other migratory larva syndromes.
• Do not confuse with other helminthic infections; confirm Gnathostoma species if possible.
• Code any associated manifestations (e.g., eosinophilia, meningitis) separately, if applicable, as secondary diagnoses.