ICD-10 Code A00.9 – Cholera, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A00.9 – Cholera, unspecified
What it is
A00.9 identifies cholera when the record does not specify the causative Vibrio species or a more detailed subtype. Use it for documented cholera without further classification.
Clinical signs
Clinical features vary; refer to documentation. Cholera commonly presents with acute watery diarrhea and rapid fluid loss, and severe cases may show dehydration.
When to use this code
Use A00.9 when the provider documents cholera but does not identify the organism or specify a more exact cholera category. It is appropriate when the note simply states “cholera” or “cholera, unspecified.”
If the chart includes a more specific cholera diagnosis, code that specific option instead. Check documentation for any organism detail, disease severity, or linked outbreak information.
Do not use for
Do not use A00.9 for non-cholera infectious diarrhea or gastroenteritis. Do not use it when the record clearly identifies a more specific cholera code.
Coding tip
Query the provider if cholera is documented without enough detail to confirm the unspecified category.