ICD-10 Code B81.4 – Mixed intestinal helminthiases (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B81.4 – Mixed intestinal helminthiases
What it is
Mixed intestinal helminthiases means infection with two or more intestinal worm species at the same time. Use this code when the record identifies a combined helminth infection rather than a single parasite.
Clinical signs
Clinical features vary; refer to documentation. Patients may have gastrointestinal symptoms, and diagnosis is usually based on identification of multiple intestinal helminths in stool or other parasitologic studies.
When to use this code
Use B81.4 when the provider documents mixed intestinal helminth infection, polyparasitism with intestinal worms, or more than one intestinal helminth species. Code it when the chart clearly supports concurrent intestinal worm infections and no more specific combination code applies.
Do not use for
Do not use this code for a single intestinal helminth infection or for non-helminth parasitic disease. If the documentation names only one worm species, code that specific infection instead.
Coding tip
Verify that more than one intestinal helminth is documented before assigning B81.4.