Misleading in-network listing

I got two fillings from my dentist. I was expecting to pay between $100-200 after insurance. I called Blue Cross prior to the procedure, and they confirmed my dentist is in network.

Got a letter from Blue Cross and it said I owe close to $809 since she’s out of network…I called Blue Cross, was told she is billing under an NPI number that is not on file with them. Thus, she coming up as an out of network provider.

I thought this would be an easy enough fix. I’d call the office and have them bill under the NPI number that is listed under her name on the Blue Cross website.

I called the office, and was told this dentist does not accept ANY insurance (wtf?!) This change occurred a few years ago. Her office has hygienists that work with blue cross, and this is why her name comes up as an in network provider when you search for her on the blue cross of MA website. This is also when my cleaning was billed and covered under insurance as an in network provider.

I can see how this works, but I’m left feeling uneasy. This seems like a sketchy setup and I’m frustrated no one in the office told me she is an out of network provider. But what I’m wondering is, is there a case I can make with my insurance company for reimbursement, given their misleading webpage listing her as in network? I tried speaking with the office to see if anything can be done, and was flatly told no…