Many people who sign up for Medicare stick with the original version of it -- Parts A and B, plus a Part D drug plan. But you may have instead opted to sign up for a Medicare Advantage plan.

Advantage plans are offered by private insurers and work similarly to the health insurance plans workers tend to be familiar with. And one major benefit of signing up for Medicare Advantage over original Medicare is that your plan might cover a host of extra services, like dental care and eye exams. When you're on a fixed income that consists largely or solely of Social Security benefits, having that additional coverage could be crucial.

But there may come a point when it's time to change Medicare Advantage plans, and right now, you have a prime opportunity to do it. Medicare's annual fall open enrollment period just got underway, and between now and Dec. 7, you have the option to change Advantage plans if that's a route you want to take. Here are a few signs that such a change may be in order.

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Source Fool.com