ICD-10 Code A07.9 – Protozoal intestinal disease, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A07.9 – Protozoal intestinal disease, unspecified
What it is
A07.9 identifies an intestinal infection caused by a protozoan organism when the specific parasite is not documented. Use it for nonspecific protozoal enteric disease rather than a named parasite.
Clinical signs
Clinical features vary; refer to documentation. Commonly, patients may have diarrhea, abdominal discomfort, nausea, or other signs of infectious gastroenteritis, but the record should support a protozoal intestinal infection.
When to use this code
Use this code when the provider documents protozoal intestinal disease without naming the organism. It also fits cases where the chart confirms a protozoal cause, but the exact parasite is not available. If the organism is identified, code the specific diagnosis instead.
Do not use for
Do not use this code for bacterial, viral, or noninfectious gastrointestinal disorders. If documentation names a specific protozoal infection, check documentation and assign the more specific code.
Coding tip
Look for the organism name in the assessment, stool results, or final diagnosis before defaulting to A07.9.