Mealey's (May 17, 2022, 9:36 AM EDT) -- WASHINGTON, D.C. — Some Medicare Advantage organizations denied coverage for preauthorized services that appear to meet the Medicare standard at a rate — up to 13% — that raises concerns about enrollees’ ability to obtain medically necessary care, according to an April 28 report from the Department of Health and Human Services’ Office of the Inspector General (OIG)....