High-deductible Plan G is a standardized Medicare Supplement (Medigap) letter variant sold in most states. It covers the same benefit categories as standard Plan G after you meet a high annual deductible set each year by CMS—except that high-deductible Plan G typically still helps with Part B excess charges from the first dollar in states where excess charges apply (confirm your outline of coverage). Monthly premiums are usually lower than standard Plan G; you take more early-year risk in exchange.
Product overview: What is Medigap. When to buy without underwriting: Medigap open enrollment basics. Later guaranteed-issue paths: Medigap guaranteed issue basics. Part B deductible vocabulary: Medicare Part B deductible basics.
Standard Plan G vs high-deductible Plan G
| Feature | Standard Plan G (typical) | High-deductible Plan G (typical) |
|---|---|---|
| After you meet Medicare’s rules | Helps with Part A/B deductibles and coinsurance per the letter chart; you still pay the Part B deductible yourself on standard G | Same letter benefits after you meet the high annual Medigap deductible |
| Part B deductible | You pay the annual Part B deductible; Plan G then helps with Part B coinsurance | Counts toward (and sits inside) the high-deductible structure—read the outline |
| Part B excess charges | Usually covered where excess charges exist | Usually covered from dollar one even before the high deductible is met—confirm |
| Premium | Higher | Lower |
| Best fit (educational) | Prefer predictable monthly cost; expect claims | Healthy years, strong emergency fund, willing to self-fund up to the high deductible |
Massachusetts, Minnesota, and Wisconsin use different Medigap systems. Always compare same-letter quotes from UnitedHealthcare, Humana, Aetna, Mutual of Omaha, and Blues affiliates on Medicare.gov and insurer sites.
How the high deductible behaves
- CMS publishes the high-deductible Plan G / Plan F deductible amount for the calendar year (illustrative ballpark in recent years has been a few thousand dollars—look up the current figure on Medicare.gov; do not rely on memory).
- You pay Medicare-covered cost-sharing that would otherwise be Medigap’s job until that high deductible is met for the year.
- After the high deductible is met, high-deductible Plan G generally pays like standard Plan G for the rest of the year on covered cost-sharing.
- The high deductible is separate from Medicare Advantage MOOP math; you cannot pair Medigap with Advantage (Medicare Advantage MOOP basics).
- Premium vs deductible tradeoffs in plain insurance language: Premiums vs deductibles.
Worked example: $2,000 premium gap vs a high-claim year
Alex is 65, on Original Medicare, and compares two Medigap Plan G quotes in the same state during open enrollment:
- Standard Plan G: $180/month ($2,160/year) from a Humana affiliate (illustrative).
- High-deductible Plan G: $70/month ($840/year) from a UnitedHealthcare affiliate; CMS high deductible for the year is $2,800 in this illustration.
Quiet year: Alex has only routine Part B visits after the Part B deductible. Standard G total ≈ $2,160 premiums + Part B deductible. High-deductible G total ≈ $840 premiums + whatever Medicare cost-sharing Alex pays up to the high deductible (often still modest if utilization is low). High-deductible G can win on cash flow if claims stay light and Alex keeps a funded emergency buffer.
Heavy year: Outpatient procedures push Alex’s Medigap-eligible cost-sharing to $2,800 before high-deductible G pays like standard G. Rough stack: $840 premiums + $2,800 deductible-layer costs ≈ $3,640, versus standard G’s $2,160 premiums plus the Part B deductible Alex would pay anyway. In that year standard G can look cheaper despite the higher premium—especially if Alex would otherwise finance medical bills (Medical credit cards and payment plans).
Alex picks based on emergency-fund size, expected procedures, and risk tolerance—not the lowest premium alone—and calendars Medigap OE so underwriting does not lock options later.
Practical habits
- Pull same-letter quotes for standard G and high-deductible G from at least three issuers.
- Write down this year’s official high-deductible amount from Medicare.gov.
- Stress-test a quiet year and a bad year against your cash reserves.
- Confirm excess-charge treatment on the outline before you assume first-dollar help.
- Enroll in Part D separately if you keep Original Medicare + Medigap.
- Buy only through licensed channels; Medigap phishing scripts exist alongside real SHIP counseling.
Checklist
- Confirm Original Medicare (not Advantage) before shopping either Plan G variant.
- Compare premiums for the same letter in your state.
- Record the current CMS high-deductible figure and your Part B deductible.
- Size an emergency fund that can absorb the high deductible if you choose that variant.
- Calendar Medigap open enrollment or document another guaranteed-issue right.
- Keep outlines of coverage and premium quotes with your Medicare card copies.
Plan N office-visit and ER copays vs standard Plan G: Medigap Plan N copay basics.
Educational only. Not insurance, tax, or legal advice. Not a plan recommendation. Medigap benefits, high-deductible amounts, and underwriting rules are federal and state-specific and change; confirm with Medicare.gov, your state SHIP program, and insurer outlines of coverage.