Medicare Supplement
Same Medigap Plan G in Oxnard: how to compare the insurers selling it in California
Oxnard, Calif. — If you have shopped for a Medicare Supplement policy in Ventura County, you have probably noticed something strange: the same plan letter shows up over and over, sold by very different companies. That is not a mistake. Medigap plans are standardized by the federal government, so a Plan G from one insurer covers exactly the same things as a Plan G from another. What actually changes from company to company is how the policy is priced, how those prices move over time, and what you have to go through to get approved.
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Click to call 855-729-3240Key takeaways
- Every Medigap plan letter is standardized, so Plan G (or N, or any other letter) offers the same benefits no matter which insurer sells it in California.
- California insurers can price the same letter using different methods — attained-age, issue-age or community rating — which changes how your premium behaves as you get older.
- Ask about household or spousal discounts and about rate history, not just today's premium, because both affect what you pay over time.
- Outside your one-time Medigap Open Enrollment Period, most California applicants can be medically underwritten; California's "birthday rule" is a key exception.
Here is how to compare apples to apples in California.
The plan letter is the coverage — the company is the price
Medigap plans sold today to people newly eligible for Medicare come in standardized letters: A, B, D, G, high-deductible G, K, L, M and N. (Plans C and F are only available to people who were eligible for Medicare before January 1, 2020.) Because the benefits inside each letter are set by federal rules, a Plan N from one carrier pays the same share of your Part A and Part B cost-sharing as a Plan N from any other carrier.
That means when you compare, say, two Plan G quotes in Oxnard, you are really comparing three things: the premium, the company behind it, and the rules that will govern how that premium changes.
Who sells Medigap in California
Ventura County residents can buy from any insurer licensed to sell Medigap in California. The table below lists every insurer in the state and the plan letters each one offers. In alphabetical order, they are: AARP - UnitedHealthcare Insurance Company, AFLAC, American Retirement Life Insurance Company (CIGNA), Anthem BlueCross - California, Bankers Life (underwritten by Washington National Insurance Company), Blue Shield of California Life & Health Insurance Company, Continental Life Insurance Company of Brentwood, Tennessee (Aetna), Everence Association Inc., Humana (Humana Insurance Company), Insurance Company of North America, Lumos Insurance, Mutual of Omaha (United World Life Insurance Company), State Farm Mutual Automobile Insurance Company, United American Insurance Company, and USAA Life Insurance Company.
Not every insurer offers every letter. If you have your heart set on Plan G-HD, for example, your shortlist is smaller than if you are open to Plan G or Plan N. The table shows which letters each company sells.
The three pricing methods, in plain English
California allows Medigap insurers to price policies in different ways. The method matters because it tells you how your premium is likely to move over time.
- Attained-age rated. The premium is based on your current age and generally goes up as you get older. It often looks lowest at 65 and climbs from there.
- Issue-age rated. The premium is based on how old you were when you bought the policy. It can still rise due to inflation and claims, but not simply because you had another birthday.
- Community rated. Everyone in the same area pays the same premium regardless of age. A 65-year-old and an 80-year-old on the same plan pay the same base rate.
None of these methods is automatically better. A community-rated policy may start higher and stay flatter; an attained-age policy may start lower and rise faster. Ask each insurer, in writing, which method they use for the letter you are considering.
Rate history matters more than the first-year price
Because Medigap premiums can and do change, the number on today's quote is only part of the picture. Ask each company — or check the California Department of Insurance rate guide — for the insurer's rate increase history on that plan letter over the last several years. A company with a steady, modest track record can end up costing very differently over a decade than one with sharp jumps, even if today's premium looks similar.
The California Department of Insurance publishes a Medicare Supplement rate comparison guide by ZIP code that shows premiums by company and plan letter. Medicare.gov's Medigap policy search is a second useful starting point.
Household discounts and other price adjusters
Several California Medigap insurers offer a household or spousal discount — often between 5% and 12% — if two people in the same home have policies with the same company, or in some cases simply if another adult lives with you. The rules differ by carrier and are not always advertised. It is worth asking directly.
Some companies also offer small discounts for paying annually or by electronic funds transfer. Again: ask.
Underwriting: when the company can say no
This is where many Oxnard shoppers get tripped up. During your one-time, six-month Medigap Open Enrollment Period — which starts the month your Part B becomes effective and you are 65 or older — insurers must sell you any Medigap policy they offer, at their standard rate, regardless of your health.
Outside that window, in most cases, insurers in California can ask health questions and can decline you or charge more. There are exceptions, including certain "guaranteed issue" situations tied to losing other coverage.
California also has a well-known birthday rule. Each year, for a 60-day window that starts on your birthday, you can switch to another Medigap policy with equal or lesser benefits from any insurer without medical underwriting. That gives Californians a yearly chance to re-shop the same letter across companies — an option many other states do not have.
How to actually run the comparison
A practical approach:
1. Pick the plan letter you want first, based on the coverage you need. 2. Pull the list of California insurers that sell that letter from the table. 3. For each one, ask about the pricing method, the rate change history for that letter, and any household discount. 4. Confirm whether you are in Medigap Open Enrollment, the birthday rule window, or a guaranteed-issue situation — that decides whether underwriting applies. 5. Compare quotes only among companies you would actually be approved by, and only for the same letter.
Where to get unbiased help
For personalized guidance, Ventura County residents can call California's HICAP (Health Insurance Counseling and Advocacy Program), the state's SHIP, for free one-on-one counseling. You can also call 1-800-MEDICARE, visit medicare.gov to use the Medigap policy search, and check the California Department of Insurance website for its Medicare Supplement rate comparison guide.
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.
Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.
By the numbers
How people get Medicare in Ventura County
(MA penetration in Ventura County)
MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.
Who sells Medigap here
Medigap insurers in California
Insurers offering Medigap policies in California, listed alphabetically. Prices vary by insurer for the same letter and are not shown here.
- AARP - UnitedHealthcare Insurance Company Plans A, B, C, F, G, K, L, N
- AFLAC Plans A, F, G, N
- American Retirement Life Insurance Company (CIGNA) Plans A, F, G, G-HD, N
- Anthem BlueCross - California Plans A, F, G, N
- Bankers Life (Underwritten by Washington National Insurance Company) Plans A, F, G, G-HD, N
- Blue Shield of California Life & Health Insurance Company Plans A, F, G, N
- Continental Life Insurance Company of Brentwood, Tennessee (Aetna) Plans A, B, F, F-HD, G, N
- Everence Association Inc. Plans A, F, G, N
- Humana (Humana Insurance Company) Plans A, B, C, F, F-HD, G, G-HD, K, L, N
- Insurance Company of North America Plans A, F, G, G-HD, N
- Lumos Insurance Plans A, F, G, N
- Mutual of Omaha (United World Life Insurance Company) Plans A, F, G, G-HD, N
- State Farm Mutual Automobile Insurance Company Plans A, C, D, F, G, N
- United American Insurance Company Plans A, B, C, D, F, F-HD, G, G-HD, K, L, N
- USAA Life Insurance Company Plans A, F, G, N
Source: Medicare.gov Medigap policy search. No insurer is ranked or recommended.
Medicare Supplement (Medigap)
The Medigap plans you can buy in California
Medigap plans are standardized by federal law: a Plan G from one insurer covers the same things as a Plan G from any other. Insurers set their own prices, which are not shown here.
| Plan | What it covers | Open to new enrollees |
|---|---|---|
| Plan A | The basic benefits every Medigap plan includes: Part A hospital coinsurance and up to 365 extra hospital days, Part B coinsurance, the first three pints of blood, Part A hospice coinsurance. | Yes |
| Plan B | Plan A plus the Part A hospital deductible. | Yes |
| Plan C | Plan B plus skilled-nursing coinsurance, the Part B deductible and foreign-travel emergency care. Closed to people newly eligible for Medicare on or after January 1, 2020. | Only if you were eligible before 2020 |
| Plan D | Plan B plus skilled-nursing coinsurance and foreign-travel emergency care (not the Part B deductible). | Yes |
| Plan F | Every standardized benefit, including the Part B deductible and Part B excess charges. Closed to people newly eligible on or after January 1, 2020. A high-deductible version exists. | Only if you were eligible before 2020 |
| Plan G | Every standardized benefit except the Part B deductible (which you pay yourself each year). A high-deductible version (G-HD) pays after you meet a yearly deductible. | Yes |
| Plan K | Pays a share of most cost-sharing (50 percent for several benefits) with a yearly out-of-pocket limit set by federal rules. | Yes |
| Plan L | Like Plan K with a larger share (75 percent) and a lower yearly out-of-pocket limit. | Yes |
| Plan M | Like Plan D but covers half of the Part A hospital deductible. | Yes |
| Plan N | Like Plan G, except a small copayment for some office and emergency-room visits, and it does not cover Part B excess charges. | Yes |
Source: CMS, Medicare Supplement Insurance (Medigap) rules; medicare.gov.
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Good to know
Frequently asked questions
Is a Plan G from a big-name insurer better than a Plan G from a smaller one?
Can I switch Medigap insurers in California without answering health questions?
What is the difference between attained-age, issue-age and community-rated pricing?
Where can I see every Medigap insurer selling in Oxnard?
- Medicare.gov Medigap policy search and state insurance-department rate guides
- CMS — Medicare Supplement Insurance (Medigap) rules (medicare.gov)
For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.
Also for Oxnard
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This page was last updated: September 2026.