Angiostrongyliasis due to Parastrongylus cantonensis

This code represents an infection caused by the nematode Parastrongylus cantonensis, commonly known as the rat lungworm, which primarily affects the central nervous system. It typically manifests as eosinophilic meningitis or meningoencephalitis, resulting from the parasite migrating to the brain and spinal cord.

Use this code for confirmed cases of angiostrongyliasis where Parastrongylus cantonensis is identified as the causative agent, or when clinical presentation strongly suggests this specific etiology in an endemic area. Documentation should clearly indicate the diagnosis of angiostrongyliasis and specify the involvement of P. cantonensis, often supported by serology, CSF analysis showing eosinophilia, or epidemiological links.

• Differentiate from intestinal angiostrongyliasis (B81.3), which involves a different parasitic species and primary site of infection.
• Ensure documentation specifies Parastrongylus cantonensis as the etiologic agent; otherwise, a more general or unspecified code might be appropriate.
• Consider sequencing with codes for specific neurological manifestations (e.g., meningitis, encephalitis) if they are the primary reason for the encounter.