AARP Supported Healthcare Programs That Do Not Work With Each Other

We're sorry to hear you’re having trouble with United Healthcare, @mwheelerk. We are listening and would like the chance to help as soon as possible. Please visit https://help.aarp.org/s/article/contact-aarp to chat, text, or speak with a representative who can get you in touch with our Member Relations team. - Diana G.

@mwheelerk 

For Oak Street Health, you have to check to see if your specific Medicare Advantage plan is accepted at Oak Street.

They accept Original Medicare and of course, MediGAP policies that are tied to the Original Medicare.  For Medicare Advantage plans, look them up by insurer - you just click on the insurer name and it will take you to the list of MA plans which Oak Street accepts in your area and state.

Oak Street Health - Medicare Insurance Plans Accepted.  

I came back to add this edited:

Medicare Advantage plans even under the same insurer are different and thus you have to know your specific type of MA plan (PPO / HMO / POS/ etc) - the STATE contract number of the policy is the easiest to reference when trying to determine if Oak Street takes the Medicare Advantage plan that you have -