Medicare is four moving parts and one big decision. The parts are straightforward once someone explains them. The decision - Medicare Advantage or Original Medicare with a Supplement - is the one that shapes your costs and your access to doctors for years, and it is the one most people make with the least information. We are licensed Oklahoma agents, we quote every carrier in the state, and Medicare premiums are filed with regulators so using us never costs you more.
The Big Decision
Almost everything else follows from this. There is no universally right answer - there is an answer that fits your doctors, your prescriptions, your travel, and your tolerance for surprise bills.
Original Medicare + a Supplement
- See any provider in the country who accepts Medicare. No networks, no referrals
- Predictable costs. A Supplement pays most or all of what Medicare leaves
- Higher monthly premium, lower cost when you actually use care
- Prescriptions require a separate Part D plan
- Dental, vision and hearing are not included and are bought separately
- Best for frequent travelers, snowbirds, anyone with a specialist they will not give up
Medicare Advantage (Part C)
- Replaces Original Medicare. Uses a provider network, often county-specific
- Low or zero monthly premium, with copays as you use care
- Prescription coverage is usually built in
- Often includes dental, vision, hearing and extras
- Annual out-of-pocket maximum, which Original Medicare alone does not have
- Best if you stay local, use in-network doctors, and prefer a low premium
The trap to avoid. You can generally move from a Supplement to Advantage whenever you like. Moving back is where people get caught - in most states that requires medical underwriting, and if your health has changed you can be declined. Oklahoma softens this considerably with its birthday rule, but the direction of travel still matters. Decide deliberately the first time.
Oklahoma’s Birthday Rule Changes the Math
Oklahoma is one of only eight states where a Medicare Supplement holder can switch carriers every year with no health questions - a 60 day window opening on your birthday, for any plan with the same or lesser benefits. It substantially reduces the risk of being locked into a plan whose premium climbs as you age. Most Oklahomans on Medicare have never heard of it. Read how the Oklahoma birthday rule works →
When You Can Enroll
| Window | When | What you can do |
|---|---|---|
| Initial Enrollment Period | The 7 months around your 65th birthday: 3 months before, your birth month, 3 months after | Enroll in Parts A and B, pick Advantage or a Supplement, add Part D. Your 6 month Medigap open enrollment also starts when Part B begins - this is the one time any Supplement is available to you regardless of health |
| Annual Enrollment Period | October 15 to December 7 every year | Change Advantage plans, change Part D plans, move between Advantage and Original Medicare. Coverage starts January 1 |
| Medicare Advantage Open Enrollment | January 1 to March 31 | If you are on an Advantage plan, one switch to another Advantage plan or back to Original Medicare |
| Oklahoma birthday rule | 60 days from your birthday, every year | Switch Medigap carriers with no medical underwriting, to a plan with the same or lesser benefits |
| Special Enrollment Periods | Triggered by an event | Moving, losing employer coverage, qualifying for Medicaid and other situations open a window outside the normal dates |
The deadline that costs the most. Your six month Medigap open enrollment at 65 is the only period when every Supplement is guaranteed available to you regardless of health history. Let it pass and, outside Oklahoma’s birthday window, you may face underwriting. If you are approaching 65, this is the call to make early rather than late.
The Four Parts, Briefly
| Part | What it covers |
|---|---|
| Part A | Hospital, skilled nursing, hospice, some home health. Usually no premium if you or a spouse worked 10 years |
| Part B | Doctors, outpatient care, labs, imaging, durable medical equipment. Has a monthly premium |
| Part C | Medicare Advantage. A private plan that replaces A and B and usually bundles drug coverage |
| Part D | Prescription drugs. Either standalone alongside Original Medicare, or built into an Advantage plan |
What none of them cover: routine dental, vision or hearing. Original Medicare pays nothing toward cleanings, glasses or hearing aids. Many Advantage plans include some coverage; otherwise those are bought separately. See Oklahoma dental plans.
Medicare Carriers We Quote in Oklahoma
Blue Cross and Blue Shield of Oklahoma
The state’s largest insurer, with Medicare Supplement, Advantage and Part D options. Part of HCSC. Blue Cross also offers Medicare Advantage plans including BlueLincs HMO in 58 counties for 2026.
UnitedHealthcare
The largest Medicare Advantage carrier nationally, plus AARP Medicare Rx Part D plans.
Humana
One of the two largest Advantage carriers in Oklahoma, with Advantage, SNP and standalone Part D.
HealthSpring
Formerly Cigna’s Medicare business, now HCSC. If your Cigna plan changed names, this is why.
Devoted Health
Medicare-only carrier competing on member service. Narrower Oklahoma network - verify your doctors.
Wellcare
Centene’s Medicare brand. Frequently among the lowest Part D premiums in the state.
Physicians Mutual
Medicare Supplement written by Physicians Select. Plans A, F, G and High-Deductible G only.
Other carriers write Medicare Advantage in Oklahoma, including Aetna, CommunityCare Senior Health Plan and GlobalHealth. We quote the full market rather than a short list, and availability varies by county.
A Word About Part D
Part D is the piece people get wrong most often, because they shop it on premium. Every drug plan has its own formulary, and formularies change every year. A plan with the lowest premium in the state is expensive if your medication sits on a high tier or is not covered at all.
Send us your actual medication list. We check it against the current year’s formularies before you enroll, and we re-check it each fall - because the plan that was right last year frequently is not right this year. This takes us fifteen minutes and saves people real money.
Talk to a Licensed Oklahoma Agent
Get Your Oklahoma Medicare Comparison
Tell us your ZIP code, your doctors, and your medication list. We will compare Advantage against Original Medicare with a Supplement, check your prescriptions against the current formularies, and tell you plainly which direction fits - including when the answer is to stay where you are.
Or call (855) 847-7020 and we will walk through it with you.
Common Questions
Does using an agent cost me more?
No. Medicare plan premiums are filed with CMS and state regulators. The price is identical whether you enroll through us, through the carrier, or on your own.
Should I take Medicare Advantage or a Supplement?
It depends on your doctors, travel, prescriptions and budget. Advantage means lower premiums with a network. A Supplement means higher premiums with nationwide access and predictable costs. We will walk through both rather than steer you.
When can I change plans?
Annual Enrollment runs October 15 to December 7. Advantage members get a second window January 1 to March 31. Oklahoma also gives Medigap holders a 60 day window each birthday.
Does Medicare cover dental?
Original Medicare covers no routine dental, vision or hearing. Some Advantage plans include coverage; otherwise these are purchased separately.
What happens if I miss my Medigap open enrollment at 65?
Outside that window a Supplement can require medical underwriting. Oklahoma’s birthday rule gives you an annual chance to move between same-or-lesser plans without health questions, which helps considerably, but the six month window at 65 is still the most valuable one you get.
We do not offer every plan available in your area. Any information we provide is limited to the plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.