My approval is valid for 6 months, Can I still get my surgery done??

I was approved as of 9/1 for a breast reduction. Blood results came back and I had to get additional testing done today. My surgery was set for 9/19 but my results won't be back by then. Also found out that as of 9/23 my surgeon will no longer be in network with my insurance. Approval is valid for six months from 9/1. If I schedule surgery after the 23rd Is it still in network or now becomes out of network rate?

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