What is my what?

The phone rang yesterday & it was a lady from the center that I will be having a sleep study done at the end of the month.  I've had the appointment for about two weeks now, but she was calling to "pre-register" me.  Among the verification of information that I had already given & a few new questions, she asked,  "What is your rate?"

"My rate?"

"Yes," she says, "your rate!  What is your rate?"

Rather puzzled, I told her that I did not have a clue.  I've only been on Brian's insurance for a short time & how do I know what they will charge me. 

"Rate?" I asked again.

"YES!  You know ... black or white or whatever!"

OH!  That rate!  Silly me.

Since she couldn't tell me why they need to know this information, I let her know that I am white but that I didn't think that was the cause of my sleep issues.