Visceral larva migrans

This code represents a parasitic infection caused by the migration of nematode larvae (typically Toxocara canis or Toxocara cati) through the visceral organs of a human host. It occurs when humans ingest eggs from contaminated soil, leading to a systemic inflammatory response as the larvae migrate.

Assign this code when documentation confirms a diagnosis of visceral larva migrans, often characterized by hepatomegaly, eosinophilia, and pulmonary symptoms. Supporting documentation typically includes serological tests for Toxocara antibodies, biopsy results, or clinical presentation consistent with larval migration in internal organs.

• Differentiate from ocular larva migrans (H44.19), which affects the eye.
• Code any associated organ involvement (e.g., hepatitis, pneumonitis) as secondary diagnoses.
• Ensure the documentation clearly specifies "visceral" to distinguish from other forms of larva migrans.