Understanding Medigap: How Supplemental Insurance Helps Medicare Beneficiaries Manage Costs

Millions of Americans rely on Medicare for their health coverage in retirement, but traditional Medicare doesn’t cover all out-of-pocket expenses. This is where Medigap, also known as Medicare Supplement Insurance, plays a critical role. These policies help pay for costs like deductibles, copayments, and coinsurance that Original Medicare leaves behind, offering financial protection against potentially high medical bills.

According to recent data, more than 12 million people — about 43% of those enrolled in traditional Medicare — purchase a Medigap policy to supplement their coverage. Without such supplemental insurance, beneficiaries could face significant expenses if they require frequent or costly medical care, as there is no annual limit on out-of-pocket costs under Original Medicare alone.

Why Medigap Matters for Medicare Enrollees

Traditional Medicare (Part A and Part B) covers many hospital and medical services, but beneficiaries are still responsible for various cost-sharing amounts. For example, in 2026, the Medicare Part A deductible for hospital stays is $1,676 per benefit period, and Part B requires a $257 annual deductible followed by 20% coinsurance for most services. These costs can add up quickly, especially for those managing chronic conditions or facing unexpected health events.

Medigap policies are designed to fill these gaps. Depending on the plan chosen, they may cover Part A hospital deductibles, Part B deductibles, skilled nursing facility care coinsurance, and even foreign travel emergency care. Plan G remains one of the most popular options due to its comprehensive coverage, which includes nearly all out-of-pocket costs except the Part B deductible.

Recent Trends in Medigap Premiums and Availability

While Medigap provides valuable protection, premiums for these policies have been rising in recent years. In early 2026, rate increases for Plan G policies filed with state insurance commissioners ranged from just over 12% to more than 26% in the first quarter, according to data from Telos Actuarial. This follows a pattern of double-digit increases seen in previous years, driven by rising healthcare costs and claims experience.

Despite these increases, Medigap remains a vital option for many seniors. Unlike Medicare Advantage plans, which some insurers are scaling back or exiting in certain markets, Medigap policies are standardized and guaranteed renewable in most states as long as premiums are paid. This stability makes them a reliable choice for beneficiaries seeking predictable coverage.

Who Chooses Medigap and Why

Beneficiaries who opt for Medigap often value the freedom to see any doctor or hospital that accepts Medicare, without network restrictions. This contrasts with Medicare Advantage plans, which typically require use of in-network providers. About 13% of people in traditional Medicare do not have any supplemental coverage, leaving them potentially exposed to high costs if they need extensive medical care.

Insurers such as Aetna, Blue Cross Blue Shield, Cigna, Humana, Mutual of Omaha, and UnitedHealthcare continue to offer Medigap plans in many states, though availability and pricing can vary by location. Beneficiaries are encouraged to compare plans during their Medigap open enrollment period — a six-month window that begins when they are both 65 or older and enrolled in Medicare Part B — to secure the best rates and avoid medical underwriting.

The Bottom Line

For millions of Medicare beneficiaries, Medigap insurance provides essential financial protection by covering deductibles, copayments, and other out-of-pocket costs not paid by Original Medicare. While premiums have risen, the predictability and broad access these plans offer continue to make them a cornerstone of retirement healthcare planning for many older adults.

As healthcare costs remain a concern for seniors, understanding the role of supplemental insurance like Medigap is key to making informed decisions about long-term coverage and financial security in retirement.