OPT is called Optional Practical Training, which is granted by the U.S. immigration service to the students with a F-1 visa, without applying for an H1B visa. Students can use OPT status to do legal internships.
OPT students must choose a health insurance. Schools generally do not provide health insurance. Most employers will not provide health insurance for non-full-time international students.
Before you select your own insurance, please consider the following situations: the hospital is contained within the network, deductible is too much (more than $1000), and your own financial situation.