The place of service info goes in 24-b. If it is in the patients home you would use "11". For the school, you could use "33". Box 34 should show the provider's normal address of his/her business address or office as on record with the appropriate insurers, not the address of where the treatment was done. I have a client that is a speech therapist, and most of her patients are treated in their homes. It should make no difference to the insurers where the treatment was done for this type of treatment.