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HomeMedicare SupplementOklahomaMedigap in Oklahoma for 2027: 27 Insurers and the Plans They Sell

Medicare Supplement

Medigap in Oklahoma for 2027: 27 Insurers and the Plans They Sell

OKLAHOMA CITY — As Medicare's Annual Enrollment Period for 2027 runs October 15 through December 7, 2026, Oklahomans weighing Original Medicare are also looking at Medicare Supplement, or Medigap, coverage. Medicare.gov's Medigap policy search for a central Oklahoma City ZIP code (73102) lists 27 insurers selling standardized Medigap policies in the state, offering a range of federally lettered plans.

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Key takeaways

  • Medicare.gov's Medigap policy search lists 27 insurers in Oklahoma selling standardized plans across letters A, B, C, D, F, F-HD, G, G-HD, K, L, M, and N.
  • The best time to buy a Medigap policy is during the six-month Medigap Open Enrollment Period that starts when a person is 65 or older and enrolled in Part B.
  • CMS Landscape files show 14 Medicare Advantage plans offered in Oklahoma in 2026 will not be offered anywhere in the state in 2027, and affected members get a federal guaranteed-issue right to buy certain Medigap plans.
  • Medigap does not include prescription drug coverage, so a stand-alone Part D plan is chosen separately during Annual Enrollment, October 15 – December 7, 2026.
Medicare SupplementOklahoma
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By MyMedicarePlans Editorial Desk · Medicare Education✓ Verified Team
Published ·10 min read·✓ Reviewed
Key facts: Medicare in Oklahoma
FactFigureSource
Part B standard monthly premium (2026)$202.90Medicare.gov
Part D out-of-pocket cap (2026)$2,100CMS
Part D out-of-pocket cap (2027)$2,400CMS
Annual Enrollment Period (for 2027 coverage)October 15 – December 7, 2026Medicare.gov

Area counts are for the county as a whole and are not a recommendation of any plan. Program figures are set nationally.

Medigap is separate from Medicare Advantage, and the choice between the two shapes how a person pays for care all year.

What is Medigap and how is it different from Medicare Advantage in Oklahoma?

Medigap is private insurance that works alongside Original Medicare to help pay costs Original Medicare leaves behind, such as coinsurance and deductibles. Medicare Advantage, by contrast, replaces Original Medicare as the way benefits are delivered and typically uses a provider network.

A person generally has Original Medicare plus a Medigap policy, or a Medicare Advantage plan — not both at once. With Original Medicare and Medigap, a beneficiary can see any provider in the country who accepts Medicare. Medicare Advantage plans package hospital, medical, and often drug coverage with their own rules. Medigap is standardized by federal plan letter, so Plan G from one insurer covers the same federally defined benefits as Plan G from another; what differs is the premium and the company behind it.

Which insurers sell Medigap in Oklahoma, and which plan letters do they offer?

Medicare.gov's Medigap policy search for ZIP code 73102 lists 27 insurers. What is sold can differ by ZIP code and by age, sex, and tobacco use, so a quote for a specific address may vary.

The insurers listed, with the standardized plan letters shown for each:

Across the list, the plan letters sold by at least one Oklahoma insurer are A, B, C, D, F, F-HD, G, G-HD, K, L, M, and N. Plans C and F are closed to people newly eligible for Medicare on or after January 1, 2020.

When is the Medigap Open Enrollment Period in Oklahoma and why does it matter?

A person's Medigap Open Enrollment Period is a one-time, six-month window that begins the first month they are both 65 or older and enrolled in Medicare Part B. During it, insurers in Oklahoma must sell any Medigap policy they offer at their best available rate, cannot refuse coverage based on health, and cannot charge more for pre-existing conditions.

Outside this window, an insurer can usually use medical underwriting, which means it can ask health questions and decline the application or charge more. That makes the six-month window the most forgiving time to shop.

What happens in Oklahoma if my Medicare Advantage plan is not returning for 2027?

According to CMS Landscape files, 14 Medicare Advantage plans offered somewhere in Oklahoma in 2026 will not be offered anywhere in the state in 2027. Members of a plan that is not returning get a federal guaranteed-issue right to buy certain Medigap plans, meaning insurers must sell specific policies without medical underwriting within a limited time frame.

That guaranteed-issue right is one of several triggers under federal rules. Affected members will receive notice from their plan, and Medicare.gov explains which Medigap letters are available under each guaranteed-issue situation.

Does Medigap cover prescriptions in Oklahoma, or is a Part D plan needed separately?

Medigap sold today does not include prescription drug coverage, so Oklahomans with Original Medicare and a Medigap policy choose a stand-alone Medicare Part D plan separately. In 2027, the Part D out-of-pocket cap is $2,400 (up from $2,100 in 2026), the most any Part D plan may charge as a deductible is $700, and the Part D base beneficiary premium used in the late-enrollment penalty calculation is $41.33.

Part D elections for 2027 are made during Annual Enrollment, October 15 – December 7, 2026, with coverage effective January 1, 2027.

How should I compare Medigap policies in Oklahoma for 2027?

Because benefits inside a given Medigap letter are standardized by federal rule, comparison in Oklahoma comes down to the insurer, the premium quoted for a specific age and ZIP code, how the insurer sets future rate increases, and customer service. Two Plan G policies cover the same federally defined benefits, but the premiums and company practices behind them differ.

Medicare.gov's Medigap policy search allows side-by-side comparisons for a Oklahoma ZIP code, and insurers' own documents give the exact premium and rating method. The Social Security Administration announced on October 14, 2026 a 3.6 percent cost-of-living adjustment for benefits payable beginning January 2027, which may affect household budgeting for insurance premiums.

Where can Oklahomans get free help with Medicare and Medigap questions?

Free help is available year-round from Medicare itself. Medicare.gov provides the Plan Finder, the Medigap policy search, and plain-language explanations of enrollment periods and guaranteed-issue rights, and 1-800-MEDICARE (1-800-633-4227) is open 24 hours a day, seven days a week.

For plan-specific details — exact premiums, deductibles, drug lists, provider networks, and star ratings — the Medicare Plan Finder at medicare.gov, 1-800-MEDICARE, or the plan's or insurer's own documents are the authoritative sources.

By the numbers

Medicare Part B premium, 2006–2026

The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.

$0$50$100$150$200200820122016202020242026

Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.

Key dates

Medicare enrollment periods at a glance

  • Around your 65thInitial Enrollment PeriodA 7-month window around the month you turn 65 — your first chance to sign up.
  • October 15 – December 7Annual Enrollment Period (Open Enrollment)Anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan.
  • January 1 – March 31Medicare Advantage Open EnrollmentIf you're already in a Medicare Advantage plan, you can make one change.
  • January 1 – March 31General Enrollment PeriodFor people who missed their first chance to sign up for Part B.
  • VariesSpecial Enrollment PeriodTriggered by life events like moving or losing other coverage.

Dates are set by Medicare and apply nationwide. Confirm your personal windows at Medicare.gov or 1-800-MEDICARE.

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The parts of Medicare

Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no premium for Part A.

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When can you enroll? An interactive year

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October 15 – December 7 — anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan. Changes take effect January 1.

Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.

Good to know

Frequently asked questions

Do I have to buy Medigap from a particular insurer in Oklahoma?
No. Medicare.gov's Medigap policy search for ZIP code 73102 lists 27 insurers in Oklahoma, and benefits inside each federally lettered plan are standardized, so a buyer can choose any insurer that offers the letter they want and sells in their ZIP code.
Can I switch from Medicare Advantage to Original Medicare plus Medigap during Annual Enrollment 2027?
A person can switch from Medicare Advantage back to Original Medicare during Annual Enrollment, October 15 – December 7, 2026, with the change effective January 1, 2027, but buying a Medigap policy outside a guaranteed-issue situation may involve medical underwriting. Medicare.gov explains which situations trigger guaranteed-issue rights.
Does Medigap include prescription drug coverage in 2027?
No. Medigap sold today does not include Part D drug coverage, so Oklahomans with Original Medicare and a Medigap policy choose a stand-alone Part D plan separately during Annual Enrollment for coverage starting January 1, 2027.
What should I do if my Medicare Advantage plan is one of the 14 not returning to Oklahoma in 2027?
Members of a Medicare Advantage plan that is not offered anywhere in Oklahoma in 2027 have a federal guaranteed-issue right to buy certain Medigap plans without medical underwriting. The notice from the plan and the guidance at Medicare.gov or 1-800-MEDICARE explain which Medigap letters qualify and the deadlines that apply.
Sources & further reading
  • CMS — Medicare Supplement Insurance (Medigap) rules (medicare.gov)
  • CMS — Medicare enrollment periods (medicare.gov)

For personalized answers, contact Medicare.gov or 1-800-MEDICARE.

Sources and methodology

Figures cited in this article

  • Medicare.gov Medigap policy search: the 27 Oklahoma insurers and the plan letters each sells for ZIP code 73102.
  • CMS Landscape Source File: the count of 14 Medicare Advantage plans offered in Oklahoma in 2026 and not offered anywhere in the state in 2027.
  • CMS — Medicare Supplement Insurance (Medigap) rules (medicare.gov): the Medigap Open Enrollment Period, guaranteed-issue rights, and the closure of Plans C and F to those newly eligible on or after January 1, 2020.
  • CMS — Medicare enrollment periods (medicare.gov): the Annual Enrollment dates of October 15 – December 7, 2026 for coverage effective January 1, 2027.
  • CMS Part D program parameters for 2027: the $2,400 out-of-pocket cap, $700 maximum deductible, and $41.33 base beneficiary premium.
  • Social Security Administration: the 3.6 percent cost-of-living adjustment announced October 14, 2026 for benefits payable beginning January 2027.

How we put this together: area counts come from the CMS files listed above for the county that contains this city, program figures come from CMS, Medicare.gov and the Social Security Administration, and no plan is ranked or recommended.

By The Medicare Desk · Published . For personalized answers, contact Medicare.gov or 1-800-MEDICARE.

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This page was last updated: October 2026.

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