ICD-10 Code B81 – Other intestinal helminthiases, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B81 – Other intestinal helminthiases, not elsewhere classified
What it is
B81 identifies intestinal helminth infections that do not fit a more specific category. Use it for documented worm infestations of the intestine when the organism is not otherwise classified.
Clinical signs
Clinical features vary; refer to documentation. Patients may have nonspecific gastrointestinal complaints, and diagnosis usually depends on identifying an intestinal helminth infection rather than a single named species.
When to use this code
Use B81 when the record states an intestinal helminthiasis and the provider does not name a more specific codeable organism. It also fits cases where the infection is documented as “other” or “not elsewhere classified.”
Check documentation if the note only says parasitic infection, because that may require a different code. Code the most specific organism available when the chart supports it.
Do not use for
Do not use B81 for intestinal helminth infections that have a specific ICD-10-CM code. Do not use it when the documentation identifies a non-helminth parasitic infection.
Coding tip
Look for the exact organism name in the report; if it is not specified, B81 is often the correct fallback.