There are two types of Medigap plans, 'plain' Medigap and Medicare SELECT. The SELECT plans are like HMOs. With a 'plain' Medigap you can see any provider who accepts Medicare (and is accepting new patients if you move). The plain Medigap follows you when you move.
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Saying "The SELECT plans are like HMOs" isn't completely inaccurate but is somewhat misleading. HMO's usually restrict the member to a predetermined list of providers, down to the individual doc level and often require pre-approvals to see specialists, etc. My BCBS "Select" Medigap plan only limits hospitals. I chose the BCBS "Select" plan because (1)it's hospital network contained all the local hospitals I'd be interested in using for elective admittance. Only a few specialty, boutique hospitals were omitted. (2) Emergency admittance to a non-network hospital is covered. (3) I can change to a non-Select plan at any time, with a phone call, even on short notice. If I did want to be admitted to one of the local botique/specialty hospitals for an elective procedure, I'd change to the non-select plan during the hospitalization planning stage. (4) The premiums are lower than the non-Select plans.
So, yes, the Select plan does have a hospital network. But unlike HMO's which generally restrict your doc choices, lab choices, specialist choices, etc., the BCBS Select only restricts hospital choices and here in the Chicago area their in-network hospital list is very comprehensive and they're flexible about letting you change to a non-Select plan on short notice.
Maybe instead of saying they'e like an HMO, we could say they have some HMO-like restrictions regarding hospitals but still allow broad access and can be changed to a non-Select plan on short notice at any time. At least that's how BCBS of Illinois works.
I can see where in a rural area with reasonable proximity to, say, only 2 hosptials and the one your prefer is not on the list, then the Select plan would not be your choice. You'd pay the higher premium for the non-Select plan. Here, there seems to be little reason to pay the higher premium.
Like all purchases, it pays to shop and understand what you're getting and what you're paying. The additional cost for the non-Select plan is fairly modest and I will look at changing and absorbing that when we're older and the possibility that the extra steps involved with keeping an eye on the Select plan hospital network becomes more burden than the savings is worth.