Could Aetna retract an approval?

I received my approval for surgery and my date is Feb. 3rd. I have noticed that as of 1/17/03, Aetna added a requirement to their selecton criteria. It states that the doctor supervised diet must be in the medical records, not just a summary letter from the doctor. I only had a summary letter and I was approved as of 1/6/03. What are the chances that they will retract their approval? Would they have a legal leg to stand on? I have it in writing that they will pay for the surgery and hospital stay, so I should be fine, right? I am so afraid that they will pull a switcheroo at the last hour.

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