Medicare in Oklahoma

Over 19% of beneficiaries of Medicare in Oklahoma were enrolled in Medicare Advantage plans as of 2018,¹² compared with an average of 34% nationwide.¹³ But by mid-2023, enrollment in Medicare Advantage plans in Oklahoma had grown to 38% of the state’s total Medicare population,¹ with 298,662 Oklahoma Medicare beneficiaries enrolled in Medicare Advantage plans.¹ The other 484,627 enrollees had Original Medicare.

For 2023, the availability of Medicare Advantage plans in Oklahoma ranges from just four plans in some rural counties, to 41 plans in some urban counties.²

The Medicare Annual Election Period (October 15 to December 7 each year) allows Medicare beneficiaries the chance to switch between Medicare Advantage and Original Medicare (and add, drop, or switch to a different Medicare Part D prescription drug plan). People who are already enrolled in Medicare Advantage plans also have the option to switch to a different Medicare Advantage plan or to Original Medicare during the Medicare Advantage Open Enrollment Period, which runs from January 1 to March 31.

More than half of Original Medicare beneficiaries have supplemental coverage under an employer-sponsored plan or Medicaid.¹⁴ But for those who don’t, Medigap plans (also known as Medicare supplement insurance plans) will pay some or all of the out-of-pocket costs that Medicare beneficiaries would otherwise have to pay themselves.¹⁵ Original Medicare does not limit out-of-pocket costs, so most enrollees maintain some form of supplemental coverage; Medigap plans are what’s available for people who don’t have access to an employer-sponsored plan (including retiree plans) or Medicaid.

Although Medigap plans are sold by private insurers, the plans are standardized under federal rules. There are ten different plan designs (differentiated by letters, A through N), and the benefits offered by a particular plan (Plan A, Plan F, etc.) are the same regardless of which insurer is selling the plan. So it’s easier to compare Medigap policies than it is to compare other types of health insurance; consumers can base their decision on premiums and less tangible factors like customer service, since the benefits themselves are uniform.

According to Medicare’s plan finder tool, 42 insurers offer Medigap plans in Oklahoma as of 2023.³ And according to America’s Health Insurance Plans (AHIP) analysis, there were 194,570 Medicare beneficiaries in Oklahoma who had Medigap coverage as of 2021.⁴

Unlike other Medicare coverage (Medicare Advantage plans and Medicare Part D prescription drug plans), there is no annual open enrollment window for Medigap plans.¹⁵ Instead, federal rules give enrollees a one-time six-month window when Medigap coverage is guaranteed-issue. This window starts when a person is at least 65 and enrolled in Medicare Part B (you must be enrolled in both Part A and Part B to buy a Medigap plan).

However, Oklahoma has created an opportunity for Medigap enrollees to switch to another Medigap plan with equal or lesser benefits, on a guaranteed-issue basis, as long as they haven’t had more than a 90-day gap in coverage since they first enrolled in Medigap. This opportunity became available in September 2023, and is not limited to certain times of the year. Several other states have also created opportunities for people to switch to a different Medigap plan (typically with equal or lesser benefits), but it is common to see them limited to a specific window each year.

People who aren’t yet 65 can enroll in Medicare if they’re disabled and have been receiving disability benefits for at least two years, and more than 115,000 Medicare beneficiaries in Oklahoma are under age 65. Federal rules do not guarantee access to Medigap plans for people who are under 65, but Oklahoma is among the majority of the states that have implemented rules to ensure that disabled Medicare beneficiaries have at least some access to Medigap plans.

Oklahoma was one of the first states to address this issue, and has guaranteed access to Medigap plans for people under age 65 since 1994. The initial rule just required Medigap insurers to offer at least one plan to applicants under the age of 65. But since 2017, state law has also required insurers to offer that policy without charging a higher premium to disabled enrollees (see OAC 365:10-5-129(d)). Medigap insurers in Oklahoma have to offer at least one Medigap plan to enrollees under the age of 65, during a six-month open enrollment period that begins when the person is enrolled in Medicare Part B. And insurers cannot charge a premium higher than the lowest available age-based premium that applies to that plan (ie, the rate that would be charged for a 65-year-old enrolling in the plan after gaining eligibility for Medicare due to age).

Almost all of Oklahoma’s Medigap insurers have opted to offer Plan A as their option for enrollees under the age of 65, and several companies offer Plan B, high-deductible Plan F, and high-deductible Plan G to enrollees under age 65.¹⁶

People who have Medicare prior to age 65 are granted a six-month Medigap Open Enrollment Period when they turn 65, during which they can select any available plan from any insurer in their state.¹⁵ Many more Medigap options are available to people who are turning 65 than to people below that age, so this is an opportunity for an enrollee to obtain more robust coverage if they prefer it (Plan A, which is the option that most insurers make available to people under age 65 who have Medicare in Oklahoma, is the least comprehensive Medigap plan). Oklahoma requires Medigap insurers to notify under-65 enrollees (prior to their 65th birthday) that their window to enroll in any plan on a guaranteed-issue basis is approaching.

Although the Affordable Care Act eliminated pre-existing condition exclusions in most of the private health insurance market, those rules don’t apply to Medigap plans. Medigap insurers can impose a pre-existing condition waiting period of up to six months, if you didn’t have at least six months of continuous coverage prior to your enrollment. And if you apply for a Medigap plan after your initial enrollment window closes (assuming you aren’t eligible for one of the limited guaranteed-issue rights or utilizing Oklahoma’s new rule that allows people with continuous Medigap coverage to switch to a plan with equal or lesser benefits), the insurer can consider your medical history in determining whether to accept your application, and at what premium.

Original Medicare does not provide coverage for outpatient prescription drugs. More than half of Original Medicare beneficiaries have supplemental coverage via an employer-sponsored plan (from a current or former employer or spouse’s employer) or Medicaid, and these plans often include prescription drug coverage.¹⁴

But people who are enrolling in Medicare and do not have prescription drug coverage through Medicaid or an employer-sponsored plan may need to obtain Medicare Part D prescription drug coverage. Medicare Part D plans can be purchased as a stand-alone Medicare Part D prescription drug plan, or as part of a Medicare Advantage plan with integrated Part D coverage.

For 2023 coverage, there are 24 stand-alone Medicare Part D prescription drug plans in Oklahoma, with premiums that start at $7.10/month.⁸

As of mid-2023, more than a third of Oklahoma Medicare beneficiaries (288,063 people) had prescription drug coverage under stand-alone Medicare Part D prescription drug (PDP) plan enrollment. Another 273,895 Oklahoma Medicare beneficiaries had Medicare Part D prescription drug coverage integrated with their Medicare Advantage Prescription Drug (MAPD) plans.¹ Medicare Advantage enrollment has been increasing at a much faster pace than overall Medicare enrollment, so the number of beneficiaries with MAPD coverage has been steadily growing, while the number of people with stand-alone PDP coverage has been declining.

Medicare Part D prescription drug plan enrollment is available when a person is first eligible for Medicare, and there is also the Medicare Annual Enrollment Period in the fall, from October 15 to December 7, when beneficiaries can enroll in a Medicare Part D prescription drug plan or switch to a different prescription drug plan for the coming year.

Many Medicare beneficiaries receive financial assistance through Medicaid with the cost of Medicare premiums and services Medicare doesn’t cover – such as long-term care.

Our guide to financial assistance for Medicare enrollees in Oklahoma includes overviews of these benefits, including Medicare Savings Programs, long-term care coverage, and eligibility guidelines for assistance.

Questions about Medicare eligibility in Oklahoma or Medicare enrollment in Oklahoma?

• Visit the website for the Oklahoma Senior Health Insurance Counseling Program with questions related to Medicare coverage in Oklahoma. If you prefer to call, the number is 1-800-763-2828.
• The Oklahoma Insurance Department maintains a page of resources for people who are eligible for Medicare in Oklahoma.
• Visit the Medicare Rights Center website or call 1-800-333-4114.  This nationwide resource provides helpful information geared to Medicare beneficiaries, caregivers, and professionals.