I applied us work visa, already I paid $462 for...

We would like to inform you that to continue our previous answer, and for health insurance, the party that provides you with an employment contract provides it if the matter is related to a work visa, so you should pay attention to this point so that you will not subject to fraud.
This means that the employer who provide health insurance to you, if you send the academic qualifications and grant the visa for you
So you can review the American embassy and ask to set an appointment for the interview, and in turn, it will contact you for the purpose of reviewing on the specified date and then you can inquire