Can a low thyroid keep me from getting insurance approval?

My insurance is requiring that my PCP send them a letter that states she has ruled out any endocrine disorders as a cause for my obesity. So I had labs drawn yesterday and everything was perfectly WNL, except my TSH was high, which means my thyroid is low, and now she'll probably be putting me on synthroid or something like it. Is it now likely that the insurance is going to say, "AHA! We can't possibly approve this surgery when the obvious cause of your obesity is a low thyroid."?

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