Visitor medical insurance is a short term medical insurance that would generally cover the illnesses/injuries after the effective date of the policy while traveling abroad. While not required by law, it is highly recommended to purchase visitor medical insurance as the medical expenses in USA are quite high.Visitor Medical Insurance - Instant Quotes
It is better to purchase visitor medical insurance from USA as you get better customer service, generally direct claims filing and many plans have PPO network whose providers only charge you the network negotiated fees. Most plans are renewable in case you are not sure of the exact duration or would like to pay in installments. Some plans are even refundable in case of early departure.
You can get instant quotes for visitor medical insurance from different companies on this website, compare different visitor medical insurance and make instant purchase of the visitor insurance that you like.
In most insurance plans, as soon as you make a purchase, you will get a virtual id card in the email. Next business day, the actual health insurance card will be mailed to you. That would generally contain all the information that the doctor's office would need to bill the insurance company directly.