BEWARE! I scheduled an appointment for my son and ...

BEWARE! I scheduled an appointment for my son and previously I checked if they accepted my insurance which is Blue Shield of California and they informed that they do accept it. Upon arrival I paid my deductible and they check AGAIN my coverage and reassured me that I was covered. Couple of weeks later I received a bill from them with an amount that reflected my insurance did not pay anything. For the simple 20 minute visit I was charged nearly $600. When I checked with my insurance I was told that this Hospital is not on the provider list since 2015. When I called the hospital's billing department to dispute the charge they were not willing to do anything about it.