ICD-10 Code B82 – Unspecified intestinal parasitism (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B82 – Unspecified intestinal parasitism
What it is
B82 is used for an intestinal parasitic infection when the organism is not identified or not further specified. It tells you the patient has parasitic involvement of the intestine, but documentation does not name the exact parasite.
Clinical signs
Clinical features vary; refer to documentation. Patients may have nonspecific gastrointestinal complaints such as abdominal discomfort, diarrhea, or other signs of intestinal infection, but the record must support parasitic disease.
When to use this code
Use B82 when the clinician documents intestinal parasitism without naming the organism, or when available records do not identify a specific parasite. It is appropriate for confirmed parasitic infection of the intestine when the type remains unspecified. If the chart later identifies the organism, code the more specific diagnosis instead.
Do not use for
Do not use this code for nonparasitic gastrointestinal disorders or for parasites outside the intestine. Check documentation if the record identifies a specific parasite or a different infection site.
Coding tip
Query for the organism whenever possible, because B82 is a fallback code when the parasite is not documented.