There is no definitive answer to this question since insurance requirements can vary depending on the type of US visa you are applying for. However, as a general rule of thumb, it is always advisable to have some form of health insurance in place before applying for a US visa. This is because if you are approved for a visa, you will be expected to maintain health insurance throughout your stay in the US. Failure to do so could result in your visa being revoked.
There are a few different types of health insurance that you can get in the US. Some employers offer health insurance to their employees, and if you are planning on studying in the US, your school may also offer a health insurance plan. Alternatively, you can purchase your own health insurance policy from a private insurer.
There are a few different things to keep in mind when choosing a health insurance policy. First, you will need to make sure that the policy covers you for both medical and emergency expenses. Second, you will need to make sure that the policy has adequate coverage limits. Finally, you will need to make sure that the policy meets the requirements of the US visa you are applying for.
If you have any questions about whether or not you need health insurance for your US visa, you should contact an immigration attorney or the embassy or consulate where you will be applying for your visa.