Yes, the attendee can return alone.
This depends on the type of visa being issued. The visa label will tell you how long you can stay and the validity of the visa.
As per requirement of the medical visa, you are allowed to travel to India only to help a patient undergo treatment in India.
Please contact us on our WhatsApp. We need more information. Our WhatsApp number is +8801329672100.
Please note, the hospital will not be able to admit the patient for surgery without a valid Indian Medical Visa. Please contact us on our WhatsApp for further inquiry. Our WhatsApp number is +8801329672100.