How Much Does Medicare Supplement Plan G Cost in 2027? The Full Yearly Bill

KFF’s October 2026 review of Medigap premiums used insurer filings compiled from NAIC data. It put the 2025 Plan G average at $194 a month across all policyholders, with state averages ranging from $164 in New Mexico to $257 in New York. KFF also noted that the lowest single-state Plan G figure in its data was $152, in Wisconsin.

An average blends 65-year-olds with 85-year-olds and cheap ZIP codes with expensive ones, so treat it as a reality check, not a quote. The same review found Plan G premiums rose 38% between 2020 and 2025.

Because the benefits are identical, insurers compete on who they accept and what they charge, within limits each state sets.

Here is how the pieces stack up for a full calendar year. The monthly premiums in the left column are round examples to show the math, not quotes from any insurer. Part B figures are the Medicare Trustees’ 2027 projections, which CMS normally confirms each fall.

Our calculation. Assumes at least $292 of Part B services in the year, standard Part B premium (higher incomes pay more under IRMAA) and no foreign travel claims. Drug coverage is separate.

Medigap policies sold today do not include prescription coverage, so a Plan G owner normally adds a stand-alone Part D plan. That plan has its own premium, which varies by plan and region.

The value of the premium shows up when care gets expensive. Using CMS’s 2026 Part A amounts (the 2027 amounts are announced by CMS each fall), here is what Original Medicare alone would leave a patient owing compared with a Plan G owner.

Part A figures are CMS 2026 amounts. Part B coinsurance has no cap under Original Medicare.

One admission in each of two benefit periods would cost $3,472 in Part A deductibles alone at 2026 rates, which already exceeds a year of premiums for many Plan G buyers in lower-cost areas.

The high-deductible version of Plan G has the same benefits once you meet a $3,050 deductible in 2027, set by CMS. The Part B deductible counts toward it. Compared with regular Plan G, the most extra you could pay in a bad year is $3,050 minus $292, or $2,758.

More on how the deductible works is on our high-deductible Plan G guide, and the regular plan’s single gap is covered in the Plan G deductible for 2027.

If the gap between Plan G and Plan N is large where you live, our Plan G vs Plan N comparison covers that trade-off, and typical Medigap premiums shows how other letters are priced.