I have plan F paying $399 mo. How can I switch to plan G?
Why do you want to switch?
You can’t switch Medigap plans in most States without medical underwriting, by the way, unless you are still in your initial enrollment period.
The process can be confusing. I suggest starting with an independent, non-profit help source - such as the local senior center to explain the options.
Also, having that independent persom help with running the Medicare formula for picking a drug plan makes things much easier..