Best Medicare Supplement Plans in Oklahoma 2026
Oklahoma has over 180,000+ Medigap enrollees. Plan G starts at $136/mo in Oklahoma City and averages $244/mo statewide. We compared 20+ carriers to find the best coverage in the Sooner State.
Oklahoma Has No Birthday Rule: Your Initial Plan Choice Matters
Unlike California, Oregon, and other states with birthday rules, Oklahoma does not give you an annual window to switch Medigap carriers without underwriting. Once your 6-month Open Enrollment Period ends, you will face health questions if you try to change plans. Compare carriers carefully before you enroll and consider long-term rate stability, not just today's lowest premium.
More than 180,000 Oklahomans have Medicare Supplement Insurance, also called Medigap. Oklahoma follows standard federal Medigap rules, offering plans A through N with no state-specific modifications. Plan G is the most popular choice for new enrollees, covering nearly all Medicare out-of-pocket costs except the annual Part B deductible ($257 in 2026).
MedMutual Protect offers the lowest Plan G in Oklahoma at $136/mo, which is $108 below the state average of $244/mo. Farm Bureau Insurance is the price leader for Plans B, C, D, and M. Transamerica is the only carrier offering all 10 standardized plan types with issue-age pricing. State Farm holds the highest AM Best rating (A++) with local agents across Oklahoma City, Tulsa, and rural Oklahoma.
Oklahoma has no birthday rule, so your initial Open Enrollment Period is your most important enrollment window. Use it to compare carriers carefully and choose a plan you can keep long-term.
Compare the Best Medicare Supplement Plans in Oklahoma
Our top-rated Medigap carriers in Oklahoma, ranked by the MedicareFAQ Score. Premiums shown are for a 65-year-old female nonsmoker in Oklahoma City. Rates in Tulsa and rural Oklahoma may vary slightly.
MedMutual Protect
Plan G
$136/mo
Plan N
$96/mo
AM Best
A+
MedMutual Protect is the top-rated Medigap carrier in Oklahoma for 2026, offering the lowest Plan G at $136/mo and the lowest Plan N at $96/mo statewide. With an A+ AM Best rating and competitive pricing across Plans F, G, and N, it is the best all-around choice for Oklahoma seniors.
Farm Bureau Insurance
Plan G
$294/mo
Plan N
N/A/mo
AM Best
A
Farm Bureau Insurance offers the lowest rates for Plans B ($152/mo), C ($112/mo), D ($104/mo), and M ($84/mo) in Oklahoma. If you want one of these less common plan types, Farm Bureau is the clear price leader. Note that its Plan G at $294/mo is well above the state average.
Transamerica
Plan G
$162/mo
Plan N
N/A/mo
AM Best
A
Transamerica is the only Oklahoma carrier offering all 10 standardized Medigap plan types, including the rarely available Plans K, L, and M. Its issue-age pricing locks in your rate at enrollment, making it a strong long-term value for healthy enrollees who want rate stability.
State Farm
Plan G
$152/mo
Plan N
N/A/mo
AM Best
A++
State Farm holds the highest possible AM Best rating (A++) and has local agents across Oklahoma City, Tulsa, and rural Oklahoma. Its Plan G at $152/mo is competitive and its long-term financial stability is unmatched among Oklahoma Medigap carriers.
United American
Plan G
$193/mo
Plan N
N/A/mo
AM Best
A
United American offers the lowest Plan A in Oklahoma at $110/mo and uses issue-age pricing, which locks in your rate at enrollment. It covers Plans A, B, C, D, F, G, K, L, and N, making it a solid choice for beneficiaries who want issue-age stability.
Medicare Supplement Prices in Oklahoma
Sample monthly premiums from top carriers in Oklahoma City for a 65-year-old female nonsmoker. Rates may include available household discounts. Oklahoma uses attained-age rating for most carriers, so premiums will increase as you age.
| Insurance Company | Plan G Monthly | Plan N Monthly | Plan F Monthly |
|---|---|---|---|
| MedMutual Protect | $136 | $96 | $152 |
| Nassau | $141 | N/A | N/A |
| LifeShield National | $148 | N/A | N/A |
| USAA* | $151 | N/A | N/A |
| State Farm | $152 | N/A | N/A |
| Transamerica | $162 | N/A | N/A |
| United American | $193 | N/A | N/A |
| Farm Bureau Insurance | $294 | N/A | N/A |
| State Average | $244 | $204 | $304 |
*USAA is only available to military members, veterans, and eligible family members. Lowest Plan G for the general public: $136/mo (MedMutual Protect). Source: Oklahoma Insurance Department, FairSquare Medicare, MoneyGeek, May 2026.
Plan G vs. Plan N in Oklahoma
Plan G and Plan N are the two most popular Medicare Supplement plans for new enrollees in Oklahoma. Here is how they compare.
| Benefit | Plan G | Plan N |
|---|---|---|
| Part A hospital coinsurance | Covered | Covered |
| Part B coinsurance (20%) | Covered | Covered* |
| Part A deductible ($1,676) | Covered | Covered |
| Part B deductible ($257) | Not covered | Not covered |
| Part B excess charges | Covered | Not covered |
| Skilled nursing coinsurance | Covered | Covered |
| Foreign travel emergency | Covered | Covered |
| Office visit copay | $0 | Up to $20 |
| ER copay (no admission) | $0 | Up to $50 |
| Avg. monthly premium (OKC) | $136-$162 | $96-$204 |
*Plan N covers Part B coinsurance but may charge up to $20 for some office visits and up to $50 for ER visits that do not result in inpatient admission. Oklahoma allows excess charges, so Plan N enrollees should confirm their doctors accept Medicare assignment.
Oklahoma has no birthday rule, so your initial enrollment decision is the most important one you will make. Do not just pick the cheapest premium today. MedMutual Protect at $136/mo is the lowest Plan G in the state, but its attained-age pricing means your rate will increase every year. Transamerica at $162/mo uses issue-age pricing that locks in your rate at enrollment, which can save you money over the long term. State Farm at $152/mo offers the highest financial strength (A++) with local agents in OKC and Tulsa. If you want the lowest Plan N, MedMutual Protect at $96/mo is the clear winner. For Plans B, C, D, or M, Farm Bureau Insurance has the lowest rates in Oklahoma.
Oklahoma Medigap Rules You Should Know
No Birthday Rule in Oklahoma
Oklahoma does not have a birthday rule. Outside of your 6-month Open Enrollment Period when you first turn 65 and enroll in Part B, you will face medical underwriting if you try to switch Medigap carriers. This makes your initial plan choice especially important.
Standard 6-Month Open Enrollment Period
Federal law gives you a 6-month Open Enrollment Period starting the month you turn 65 and enroll in Medicare Part B. During this window, no carrier can deny you coverage or charge higher premiums due to pre-existing conditions. This is the best time to enroll.
Under-65 Coverage Not Required
Oklahoma does not require Medigap carriers to offer coverage to Medicare beneficiaries under age 65 (such as those with disabilities). If you are under 65 and on Medicare, you may have difficulty finding Medigap coverage in Oklahoma. Some carriers offer it voluntarily at higher rates.
Attained-Age Rating Dominates
Most Oklahoma Medigap carriers use attained-age rating, meaning your premium increases as you get older. Transamerica and United American use issue-age rating where your premium is locked at the rate for your age when you enroll. Issue-age plans often start higher but can be cheaper over the long term.
Excess Charges Are Allowed in Oklahoma
Oklahoma does not ban Medicare excess charges. Providers who do not accept Medicare assignment can charge up to 15% more than the Medicare-approved amount. Plan G covers these excess charges; Plan N does not. If your doctors do not accept Medicare assignment, Plan G is the safer choice.
Free Help via Oklahoma SHIP
Oklahoma's State Health Insurance Assistance Program (SHIP) provides free, unbiased Medicare counseling through the Oklahoma Insurance Department. Call (800) 522-0071 statewide, (405) 521-2828 in Oklahoma City, or (918) 295-3700 in Tulsa. Counselors do not sell insurance.
MedicareFAQ Scoring Methodology
The MedicareFAQ Score rates Medicare Supplement carriers on a scale of 1.0 to 5.0 based on five key factors. Our ratings are independent and not influenced by advertising relationships.
Financial Strength (AM Best)
Claims-paying ability and long-term stability
Customer Satisfaction
NAIC complaint ratios and member satisfaction surveys
Premium Competitiveness
Plan G and Plan N rates vs. Oklahoma market average
Plan Availability
Number of plan types offered in Oklahoma
Discounts and Value
Household discounts, EFT discounts, and added benefits
Last updated: May 2026 | Data sources: NAIC complaint ratios, AM Best ratings, CMS Medicare Plan Finder, Oklahoma Insurance Department, FairSquare Medicare
Frequently Asked Questions
Find the Best Medigap Rate in Your Oklahoma ZIP Code
Oklahoma has no birthday rule, so your Open Enrollment Period is your best chance to lock in coverage without health questions. Plan G starts at $136/mo in Oklahoma City. Compare all available carriers in your area before enrolling.