United HealthCare does not pay providers on time. They also deny claims constantly. It is basically criminal what they do. As a result, you may find it hard to obtain care, some providers will not accept UHC. I would avoid this insurance plan.
I had the UHC/AARP Medicare Advantage plan 3 years ago. In the late spring, they dropped most of the local/area healthcare groups and most of the physicians to re-negotiate.
The negotiations dragged on for about 6 months. They did reassign me a different primary care physician. [I never went to him because I didn’t want to have to change my prescriptions, etc.]
I decided the next year to go with a new carrier — Aetna — and have been very happy with them. I get $5 co-pay for the PCP ($0 co-pay the last half of 2020), $0 on 90-day generic prescriptions, $240/year in OTC goods. They did force me to change from Walgreens to Walmart pharmacy for 2021, however.