If you are concerned about the cost of personally covering 20 percent of your medical expenses through Original Medicare, you can purchase Medicare Supplemental Insurance, or Medigap, to make your out-of-pocket costs more predictable.

Source: https://www.heraldnet.com/opinion/comment-if-youre-nearing-65-heres-how-to-prepare-for-medicare/

If you are enrolled in traditional Medicare (Parts A and B), paired with a Medigap supplemental plan, there’s no need to review that coverage.

Source: https://www.nytimes.com/2023/10/14/business/medicare-open-enrollment-ads.html

The nature of Medigap means that individuals can face a dilemma if they start on a Medicare Advantage plan and later want to switch to traditional Medicare.

Source: https://www.palisadeshudson.com/2023/11/which-medicare-option-is-really-advantageous/