Regarding the billing. I was trying to change the credit card I originally used on line to a different (HSA) card. Unfortunately nobody was able to assist. I was given a number to call and they were less than helpful. They told me to call back after the bill was posted. I asked how I would know and she said just keep calling back. I asked if she could put a note by my account stating to use a different CC number and she said that she could but I should still continue to call back.  My request didn't seem that difficult, but she seemed very perplexed and I didn't like her suggestion.
AMCMC Ultrasound