ICD-10 Code B78 – Strongyloidiasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B78 – Strongyloidiasis
What it is
B78 identifies strongyloidiasis, an infection caused by Strongyloides parasites. Use it when the record documents this helminth infection, whether acute, chronic, or unspecified.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include abdominal complaints, diarrhea, rash, cough, or eosinophilia, but you should code only what is clearly supported in the chart.
When to use this code
Use B78 when the clinician diagnoses strongyloidiasis or documents Strongyloides infection. It is appropriate for confirmed cases and for encounters focused on evaluation or follow-up of the infection. If the note only says “parasite infection,” check documentation.
Do not use for
Do not use B78 for nonspecific gastrointestinal symptoms, eosinophilia alone, or other helminth infections. If the organism is not identified as Strongyloides, check documentation before assigning this code.
Coding tip
Look for the organism name in the assessment, problem list, or lab report; if it is absent, do not assume strongyloidiasis.