Editing Medicare (United States) (section)

===Medicare supplement (Medigap) policies===
{{Main|Medigap}}{{More citations needed|date=May 2020}}

All insurance companies that sell Medigap policies are required to make Plan A available, and if they offer any other policies, they must also make either Plan C available as well. Plan F is no longer offered as of 2020, but anyone who has a Plan F may keep it.<ref>{{cite web |title=How to compare Medigap policies|url=https://www.medicare.gov/supplements-other-insurance/how-to-compare-medigap-policies |website=Medicare.gov |access-date=13 March 2020}}</ref> Many of the insurance companies that offer Medigap insurance policies also sponsor Part C health plans, but most Part C health plans are sponsored by integrated health delivery systems and their spin-offs, charities, and unions as opposed to insurance companies.{{Citation needed|date=March 2025}}