I am not in NY state. However, I had a child home with tutoring services from the district due to medical conditions. In our district, you need a physician's certification that your child cannot be in the regular school environment. When it is an immune issue, it is rather obvious since they don't want to kill your child -- the liability would be tremendous. However, depending on the language of your district policy, it may be sufficient that your child cannot function in a regular school environment. I would start with the district and state websites to get contact info and policy documents. There should be some kind of standardized forms for you to forward to your child's doctor.