ICD-10 Code B81.2 – Trichostrongyliasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B81.2 – Trichostrongyliasis
What it is
Trichostrongyliasis is an intestinal infection caused by Trichostrongylus nematodes. Use this code when the record documents this specific parasitic infection.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include abdominal discomfort, diarrhea, nausea, or eosinophilia, but you should code only what is confirmed in the chart.
When to use this code
Use B81.2 when the provider documents trichostrongyliasis, trichostrongylus infection, or an equivalent diagnosis. It may also apply when the note clearly identifies the organism and infection site as intestinal. If the documentation is vague, check documentation before coding.
Do not use for
Do not use this code for unspecified intestinal parasites, helminth infections not named as Trichostrongylus, or suspected infection without confirmation. Check documentation if the chart only states parasitic disease.
Coding tip
Confirm the organism name in the assessment or lab report before assigning B81.2.