United Health Care Post Op going back on their coverage

Even after United Health Care pre approved us and our pre surgery appointment with Bariatric Treament Center had us sign a form that said we would be responsible for $1000 each, we got a letter from United Health Care saying that they would only pay 70% of the bill because our doctor was "out of network" In all of our conversations with United Health Care, they never mentioned this before surgery! My first question is can they do that? My second question is has this happened to anyone else? Thanks

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