What documents are needed for a DTV visa related to medical treatments in Thailand?

Hello everyone,

I’m planning to apply for the DTV visa for 6 months (visits and medical treatments) and I have a question about the required documents.

For this type of visa, one of the requirements is:

1. Proof of confirmation to attend the activity or letter of appointment from a hospital/medical center.

Does anyone know if it is sufficient to provide a single appointment, or do I need to include details of multiple visits or a treatment plan (e.g., medical therapy cycles)?

Any advice or experiences with this type of visa would be greatly appreciated. Thank you