ICD-10 Code B65.1 – Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B65.1 – Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]
What it is
B65.1 identifies intestinal schistosomiasis caused by Schistosoma mansoni. Use it when the record documents this specific parasitic infection, which primarily affects the intestines and can involve the liver.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include abdominal pain, diarrhea, blood in stool, hepatosplenomegaly, or eosinophilia, but the coded diagnosis should be supported by the provider’s stated infection.
When to use this code
Use B65.1 when the clinician diagnoses Schistosoma mansoni infection, intestinal schistosomiasis, or mansoni schistosomiasis. It is appropriate for confirmed disease, suspected disease documented as such by the provider, or follow-up visits tied to the active infection.
Choose this code when the chart specifies the organism rather than a general schistosomiasis diagnosis. Check documentation if the note only says “schistosomiasis” without the species.
Do not use for
Do not use this code for other schistosomiasis species, such as urinary schistosomiasis, or for nonspecific parasitic symptoms without a documented infection. Check documentation if the organism is not identified.
Coding tip
Capture the exact species name in the provider note; B65.1 depends on Schistosoma mansoni being documented.