Help understanding Illinois Mammogram & Ultrasound Laws

I live in Illinois. Some reference links:

https://www.ilga.gov/legislation/ilcs/ilcs3.asp?ActID=4034$ChapterID=35

https://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=021500050K356g

My understanding of the Illinois law is that routine mammograms are covered at 100% of the cost, as well as any follow ups like repeat mammogram or ultrasound due to unclear or other findings on the original, as long as the doctor seems them medically necessary (which, of course they are).
I recently experienced this (I am 35 years old). I have a very strong family history of breast cancer. My first mammogram was covered. The follow up was an ultrasound which was labeled diagnostic. My insurance is covering $0 and I am being charged over $400 for an ultrasound.
Am I misunderstanding this law or is my insurance company incorrect. They are telling me the only thing I can do is appeal the claim, but I don’t know how to do that. They just sent me a general phone number to call.
They also told me my mammograms cannot be covered other than this initial one until I’m 40 because of my age, regardless of my family history and risk factors. This also contradicts my understanding of Illinois law that states they must cover what my doctor recommends based on genetic testing and family history.
My workplace just switched to this insurance, and they’ve been an absolute nightmare so far. It’s some small subcontractor(?) of BCBS based in NJ, and every question I’ve asked they’ve given me a wrong answer because their customer service can’t seem to understand that I don’t live in NJ and I don't use Medicaid. Their website and app also do not work 75% of the time.

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submitted by /u/Ok-Illustrator2668
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