E.A.
Hi L.,
Welcome to Suffolk County, it's a beautiful area. Two excellent hospitals are Mather Hospital in Port Jefferson on North Country Rd. and St. Charles also in Port Jefferson on Belle Terre Rd. Depending on what town you live in, there are several doctors in the area. I use Selden Pediatrics on Boyle Rd in Selden for my children. If you need to know of any other places, just send another request.
Good luck!