ICD-10 Code B77.0 – Ascariasis with intestinal complications (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B77.0 – Ascariasis with intestinal complications
What it is
B77.0 identifies ascariasis caused by Ascaris lumbricoides when the infection affects the intestine. Use it for documented intestinal complications related to this parasitic worm infection.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings may include abdominal pain, intestinal obstruction, vomiting, or evidence of worm burden in the gastrointestinal tract.
When to use this code
Use this code when the record clearly states ascariasis with intestinal complications, such as obstruction or other intestinal involvement. It also fits when the provider links the complication directly to the parasitic infection. If the note only says ascariasis without complications, check documentation.
Do not use for
Do not use B77.0 for uncomplicated ascariasis or for non-intestinal manifestations. If the documentation does not specify intestinal complications, choose the more accurate code after review.
Coding tip
Confirm the provider documents both ascariasis and the intestinal complication before assigning B77.0.