Most Medicare Advantage enrollees could face Medigap denials if they switch back

As fall open enrollment gets underway, millions of older adults are evaluating whether to stick with their current coverage or make a change. But for those thinking about leaving Medicare Advantage to return to Traditional Medicare, an overlooked roadblock awaits: in most of the country, you may not be able to buy a Medigap policy if you have a pre-existing medical condition.

According to an analysis by [KFF], nearly three-quarters—74 percent—of Medicare Advantage enrollees live in states where private insurance carriers are permitted to deny Medigap applications or charge substantially higher premiums based on a person’s medical history.

For anyone managing chronic health issues, that dynamic can turn what appears to be a flexible annual choice into an unexpected one-way street.

The one-time window that many miss

Under federal law, beneficiaries receive a guaranteed-issue right to purchase any Medigap policy sold in their state during their initial six-month Medigap Open Enrollment period. That protection begins the month they turn 65 and enroll in Medicare Part B [KFF]. During that single six-month window, private insurers cannot review your health records, deny you a policy, or charge you extra because of past or present illnesses.

Once that initial window closes, however, federal protections largely disappear.

If you initially enrolled in a Medicare Advantage plan and later decide Traditional Medicare would better suit your needs—perhaps to see specialists without network restrictions or avoid prior authorization hurdles—you may find yourself subject to medical underwriting [KFF]. Outside of narrow exceptions, such as moving out of a plan’s service area or a plan terminating its contract, insurers in most states can look at your medical records, exclude coverage for specific conditions, or turn you down entirely.

A patchwork of state protections

Because federal law sets only a bare minimum of protections, individual states determine whether supplemental insurers can review applicant health histories [KFF].

A small minority of states have created broader guaranteed-issue rules that allow beneficiaries to buy a Medigap plan at designated times each year regardless of health status. Yet, as the [KFF] data demonstrates, those consumer protections remain the exception rather than the rule. Roughly three in four Medicare Advantage enrollees live in areas where supplemental insurers still retain full discretion to deny coverage to applicants who are sick, aging, or managing long-term conditions.

Without a Medigap policy, returning to Traditional Medicare leaves enrollees responsible for Part B’s standard 20 percent coinsurance on outpatient care, doctor visits, and durable medical equipment—with no annual out-of-pocket maximum [Medicare Rights Center]. For someone facing chemotherapy, major surgery, or frequent specialist visits, taking on that 20 percent cost share without supplemental insurance can create severe financial vulnerability.

What to check before you make a move

With Medicare Open Enrollment running through December 7, consumer advocates stress the importance of doing your homework before submitting any disenrollment paperwork [Medicare Rights Center].

If you are currently enrolled in a Medicare Advantage plan and considering a switch to Traditional Medicare, take these steps first:

• Check your state’s rules: Contact your local State Health Insurance Assistance Program (SHIP) to learn whether your state offers guaranteed-issue protections or an annual "birthday rule" allowing policy changes without underwriting [Medicare Rights Center].
• Apply for Medigap before dropping Advantage: Do not cancel your Medicare Advantage plan until you have submitted a Medigap application, gone through underwriting if required, and received written confirmation of acceptance and premium costs.
• Review your Annual Notice of Change: If you decide staying in Medicare Advantage is safer, carefully review your current plan’s Annual Notice of Change (ANOC) to confirm that your doctors, hospitals, and regular medications remain covered at reasonable copays for the coming year [Medicare Rights Center].

Open enrollment offers an annual opportunity to reassess your care, but understanding the rules governing supplemental coverage ensures you make that choice with your eyes wide open.