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More older Americans are fighting back when their Medicare Advantage plan denies a prior authorization request, according to new data. In 2022, the rate of appeals requesting a third-party review climbed to 5.6 per 1,000 enrollees, according to a report from the Commonwealth Fund. That compares to just 3.1 per 1,000 enrollees in 2016. The report notes that between 2016 and 2022…