ICD-10 Code B83.1 – Gnathostomiasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B83.1 – Gnathostomiasis
What it is
B83.1 identifies gnathostomiasis, a parasitic infection caused by Gnathostoma species. It is used when the diagnosis is confirmed or documented as this specific helminth infection.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include migratory subcutaneous swelling, pain, and intermittent skin lesions, but presentation depends on the affected site.
When to use this code
Use B83.1 when the provider documents gnathostomiasis by name or clearly identifies Gnathostoma infection. Code it for confirmed cases involving skin, soft tissue, or other organ involvement when the diagnosis is established. If the record only notes parasitic exposure or rule-out infection, check documentation.
Do not use for
Do not use this code for nonspecific parasitic infections, eosinophilia without a documented cause, or suspected gnathostomiasis without confirmation. Check documentation if the organism is not identified.
Coding tip
Assign B83.1 only when the chart names gnathostomiasis or Gnathostoma infection; otherwise, query for a more specific diagnosis.