Medigap plans are supplemental plans that are:

Medigap plans, officially known as Medicare Supplement Insurance, are designed to help cover some of the healthcare costs that original Medicare does not pay for, such as copayments, coinsurance, and deductibles. These plans are indeed sold by private commercial insurance companies.

The role of private insurers in providing Medigap plans allows for a variety of options in terms of coverage and pricing, which gives consumers the flexibility to choose a plan that best fits their individual healthcare needs. Additionally, these plans must adhere to federal and state regulations to ensure they meet certain standards of coverage, but the actual sale and service are handled by private entities.

In contrast, the other options inaccurately reflect the nature of Medigap plans. While the federal government oversees and regulates Medicare, it does not sell Medigap plans directly. Furthermore, Medicaid, which is a separate program that assists low-income individuals and families, is distinct from Medicare, and Medigap plans are not related to Medicaid. Thus, the only correct assertion is that Medigap plans are sold by private commercial insurance companies.