What is the ruling on evading payment of a hospital bill in America after being advised by the hospital official himself not to pay, given that the service provided was poor and its cost was highly exaggerated compared to the questioner's country?

It is not permissible to travel to non-Muslim countries merely for recreation and tourism, due to the inherent dangers, which include: being influenced by their religion, morals, and customs; spending large amounts of money and enriching them; the possibility of others following suit; and the risk of deviance. Travel to disbelieving countries is not permissible except for a religious or worldly benefit, and under certain conditions: that the traveler possesses knowledge to repel doubts, and faith to restrain him from desires, and that there is a genuine benefit or need for the travel.

Regarding the hospital fee, if the rental agreement is invalidated due to an unknown fee, and the service has been rendered, then a fair market value fee becomes obligatory. This is determined by experts in the locality where the transaction took place. If the hospital informed you of the fee beforehand, and the questioner agreed to it, and then a significant overcharge became apparent, he retains the option of annulment due to overcharge and pays the fair market value fee.