Medicare Supplement Plans 2026: What's New, Rates & Top Picks

Medicare Supplement Plans 2026: What's New & Premium Changes

The Medicare Supplement Plans 2026 landscape has shifted significantly from 2025. Plan G premium increases filed with state insurance commissioners in early 2026 range from 12% to 26% across Aetna, Blue Cross Blue Shield, Cigna, Humana, Mutual of Omaha, and UnitedHealthcare, according to actuarial consulting firm Telos Actuarial. These follow 2025's historic rate hikes that reached as high as 50% from some carriers. The 2026 Part B deductible climbed from $257 to $283, the Part A deductible jumped from $1,676 to $1,736, and the Part B premium rose nearly 10% to $202.90. The Inflation Reduction Act's prescription drug out-of-pocket cap also increased from $2,000 in 2025 to $2,100 in 2026. About 12 million Americans (43% of traditional Medicare beneficiaries) carry Medicare Supplement coverage, according to KFF, with another 13% of traditional Medicare enrollees having no supplemental coverage at all.

This guide explains what changed in Medicare Supplement plans for 2026, including premium trends, regulatory updates, and how the changes affect existing and new policyholders. Information comes from CMS, KFF, Telos Actuarial, and state insurance commissioner filings.

The 2026 premium increase landscape

The Medigap rate increase story dominates 2026. Brett Mushett, a consulting actuary with Telos Actuarial, noted that the early 2026 filings represent carriers correcting their premium rates in response to upward pressure on claims experience. Plan G, the most commonly purchased supplement option for new enrollees, saw the most attention with rate increases of 12% to 26% across the six major carriers in Q1 2026 alone.

The pattern continues a trend that began with the 2025 rate hikes. One particularly disruptive example involved over 80 customers enrolled in the same supplemental plan from Chubb who were hit with a 45% increase in August 2025, applied immediately to all enrollees rather than on individual policy anniversaries. Brokers describe this as unprecedented in their decades of experience.

The underlying causes include medical cost inflation continuing to outpace overall inflation, an aging population using more healthcare services, the closing pool of Medicare Plan F enrollees aging into higher-claims years (since Plan F has been closed to new enrollees since January 1, 2020), and the standard cost adjustments built into attained-age pricing models. For Plan F specifically, the closed enrollment pool means each year more older policyholders generate higher claims with no younger enrollees joining to balance the risk, pushing premiums higher than newer plans like Plan G.

2026 Part B deductible and Plan F/G/J high-deductible amounts

Several specific Medicare Supplement numbers updated for 2026. The standard Part B deductible reached $283 (up from $257 in 2025), affecting Medicare Plan G and Plan N enrollees who pay this deductible themselves before coverage begins. Plan F and high-deductible Plan F enrollees see this through coverage of the deductible.

The high-deductible versions of Plans F, G, and J now require enrollees to pay $2,950 in 2026 before coverage activates, up from $2,870 in 2025. This is significant because high-deductible Plan G has become popular for cost-conscious beneficiaries who can absorb the high deductible in exchange for substantially lower monthly premiums.

The out-of-pocket maximums for Plans K and L also adjusted for 2026. Plan K now caps annual member out-of-pocket spending at $8,000, while Plan L caps spending at $4,000. After hitting these limits, plans cover 100% of approved costs for the remainder of the calendar year.

What didn't change for 2026

Medicare Supplement plan standardization remains intact. The federal government's standardized plan structure means a Plan G from Cigna offers identical core medical benefits to a Plan G from Aetna, UnitedHealthcare, or any other carrier. What varies is monthly premium, customer service quality, rate stability over time, and any added perks like household discounts or fitness programs.

The standard plans available to new enrollees in 2026 remain Plans A, B, D, G, K, L, M, and N. Plan F continues to be unavailable to new beneficiaries who became Medicare-eligible on or after January 1, 2020. Pre-2020 eligible beneficiaries can still buy or keep Plan F.

Guaranteed-issue rights also remain unchanged. The initial 6-month Medigap Open Enrollment Period starting when you turn 65 and enroll in Part B continues to provide guaranteed acceptance regardless of health conditions. Outside this window, most states allow insurers to medically underwrite applicants, charge higher premiums for pre-existing conditions, or deny coverage entirely.

Birthday rule states (at least 16 in 2026) allow Medigap enrollees to switch to different supplemental coverage annually without medical underwriting, typically around their birthday month. Four states (Connecticut, Massachusetts, Maine, and New York) require insurers to offer at least one Medigap policy to all applicants without underwriting, either year-round or during annual enrollment. Minnesota was scheduled to join this group in August 2025 but the law was delayed to August 2026.

2026 forced disenrollment impact on Medigap

A significant 2026 development affected Medicare Supplement enrollment: approximately 440,000 Americans switched from Medicare Advantage to Medicare Supplement plans this year, according to Deft Research analysis. This shift resulted primarily from Medicare Advantage insurer market exits that displaced about 2.6 million enrollees in 2026.

The displacement matters because Medicare Advantage members forced out by their plan's exit qualify for guaranteed-issue Medigap rights without medical underwriting. This is one of the few situations outside the initial 6-month Medigap Open Enrollment Period where consumers can obtain Medigap regardless of health status.

For those returning to Original Medicare from a discontinued Medicare Advantage plan, the window to obtain guaranteed-issue Medigap is typically 63 days after the Medicare Advantage coverage ends. Acting quickly within this window has been critical for many displaced beneficiaries.

How regulatory changes affect 2026 plans

CMS finalized several rule changes affecting Medicare beneficiaries in 2026. The Inflation Reduction Act's $2,100 Part D out-of-pocket cap applies to all Part D plans whether standalone or bundled with Medicare Advantage, though most Medicare Supplement enrollees pair their plan with a standalone Part D plan. Once total prescription drug out-of-pocket spending reaches $2,100, the enrollee pays $0 for covered medications for the rest of the year.

The Medicare Prescription Payment Plan, which lets enrollees spread out their drug costs across the year through monthly payments to their plan rather than at the pharmacy, automatically renews for 2026 participants. This is helpful for Medigap enrollees who use Medicare Part D and would face high single-month drug costs.

A new Special Enrollment Period was added in 2026 for Medicare Advantage enrollees who discover after enrollment that their providers aren't actually in-network. This SEP allows them to switch plans or return to Original Medicare, where they may then qualify for Medigap.