Prenatal Ultrasound and Insurance

Hi,

I am 11 weeks pregnant and had my first prenatal checkup at 9 weeks. I also had an ultrasound as part of it. I have been billed 450$ for that which is so steep. I checked with my insurance and they said that they dont cover the amount since its for diagnostic and not preventive. Does it really cost that much for just a prenatal ultrasound. Also the obgyn i went to is an in network provider. So i dont see any reason for such a high bill.

This provider is in Los Gatos, California and part of pamf medical foundation. And my insurance is from Aetna.

I am now scared about the bills that i might be receiving after every visit!