ICD-10 Code B82.9 – Intestinal parasitism, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B82.9 – Intestinal parasitism, unspecified
What it is
This code identifies an intestinal parasitic infection when the specific organism is not named in the record. Use it for parasitic infestation of the bowel that is documented, but not further classified.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include abdominal discomfort, diarrhea, weight loss, or other nonspecific gastrointestinal complaints, but the chart must support parasitic involvement.
When to use this code
Use B82.9 when the provider documents intestinal parasitism without identifying the parasite species or when the record states an unspecified parasitic infection of the intestine. It is also appropriate when the available documentation confirms intestinal parasitism but lacks enough detail for a more specific code.
Do not use for
Do not use this code for a known parasite with a more specific ICD-10-CM option. Do not use it for nonparasitic gastrointestinal disorders or when documentation only says “rule out” parasitic disease.
Coding tip
If the organism is named anywhere in the chart, code the more specific diagnosis; otherwise, check documentation before defaulting to B82.9.