Based on AARP's recommendation I purchased Medicare Part D fro United Healthcare. They spent 3 months telling me that I had other coverage from the employer that I retired from. We finally got that worked out and I find out that they have been overcharging me since August 2019 through April of 2020. After spending 3 hours on the phone and finally talking to someone they said sorry nothing they can do and they will continue charging me too much. Do not make the mistake of trusting an AARP recommendation or buying insurance from United Healthcare.