Are medical prescriptions written by physicians located outside the United States recognized in the United States?
I'm interested in medical imaging (e.g., MRI or x-ray) and physiotherapy sessions. (see this question regarding prescriptions for pharmaceutical drugs.)
The recognition (or the lack of) may happen at different levels, such as the federal laws, the state laws, physicians, or the health insurances.
Example of MRI prescription (source):
A few related questions on the terminology and laws: