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California Medicare Options - Is it necessary to get a Medicare Supplement?

is it necessary to get a medicare supplement


Is it Necessary To Have a Medicare Supplement?

The Real Cost of Medicare in 2026 (Advantage vs Supplement REAL Costs Explained) - Watch on YouTube



We get this question often and it's legitimate.


For most people coming off of the Exchange or Employer health coverage, Medicare is a brave new world!


Different terminology. Different plans.


It's really important to understand what it covers by itself and most importantly, what it doesn't!


We get calls on the other side where someone only has Medicare and finds out the hard way.


Let's go through the whole question from top to down and more importantly, look to see the best values for covering the "holes" in Medicare.


Here are the topics:


  • Is it necessary to have a Medicare Supplement?
  • What is the risk of just having Medicare
  • What's the least expensive way to cover the holes in Medicare
  • How should I compare and quote the Medicare options
  • What if I don't like the Advantage or Medigap plan - Can I go back to Medicare by itself


Let's get started!


Is it necessary to have a Medicare Supplement?


Absolutely not. You can just have Medicare by itself.


Let's spell out what means exactly.


Traditional Medicare is broken up into 2 parts:


  • Part A - Hospital of facility care that most people have paid for their whole life via payroll taxes
  • Part B - Doctor charges which has an optional monthly premium

Usually, Part A is automatic. This means you have coverage with limits (more below) for hospital or facility based care.


You can "opt in" for Part B to cover doctor changes (think...out of the hospital).


This requires a monthly premium which can change depending on your income



There's also a separate Part D for medication which you pay a monthly premium for if you wan to.


One note...if you don't get a Part D plan when eligible, you'll start to add a 1%/month penalty if you every choose to add it!


Alright...we have our basic parts. What exactly do they cover?


The core benefits for both Part A and B revolve around:


  • An initial annual deductible you have to pay first before benefits kick in
  • After deductible, you pay 20% coinsurance for remainder of the year

There are other bells and whistles (blood, preventative, etc) but the deductible and 20% coinsurance is really the heart of traditional Medicare.


A and B just tells what type of care they're applied to (hospital versus doctor).


A is usually free and automatic. B requires a monthly premium and is optional.


So...a Medicare supplement is not necessary in the truest sense of the word but that's a bit misleading.


Here's why.


What is the risk of just having Medicare

The deductibles are fixed amounts.


Roughly (since they change a bit each year):


  • Part A - $1600+
  • Part B- $283+

We can kinda wrap our heads around these amounts if we have healthcare costs. We can budget for that (not that we should...more on that below).


It's the 20% coinsurance that's an issue. A big issue!


There's no cap to it!

For a $100K bill, you're on the hook for $20,000.


what are the gaps in medicare

Which generally leads to..."I never go to the doctor. I'm healthy!"


Totally understand that but there are two things working against this approach.


First, our healthcare costs double with every decade of our life on average and 65+ is the worst time to take this gamble.


costs for healthcare by age



Second, the trajectory for healthcare costs is through the roof.


the problem with only having traditional medicare


In the aftermath of Covid, we're seeing clients with claims of $250K, $1M, and even $5M (open heart surgery).


It just doesn't make sense to risk that open-ended 20% when there are ways to cover the coinsurance for very little cost.


Let's go there now.


What's the least expensive way to cover the holes in Medicare


There are two approaches to addressing the 20% and/or other holes of Medicare:


  • Advantage plan - HMOs generally with low or no cost but more restrictive
  • Medicare supplements - wraps around traditional Medicare to cover the holes


We have a big comparison of Advantage versus Medicare supplements.


The net net:


  • If you like the flexibility of traditional Medicare (see all Medicare doctors and
  • Have more control over health care decisions), then supplements will be the better fit.

There's a comparison of what Medicare supplement plans cover but the quick lay of the land.


First, the range of options:


what do medicare supplement plans cover



Focus on four price points:


  • G plan - most comprehensive and most popular; just missing the Part B deductible
  • A plan - just covers the 20% coinsurance
  • N plan - adds in copays for office and urgent care
  • High deductible G plan - builds a roughly $2-3K deductible into the G plan

On the Advantage side, focus on the Triple Threat:


  • Zero premium
  • Max out of pocket around $800
  • Star Rating of 4 stars or higher


We go through this at our Insider's Guide to Advantage plans


how to compare california medicare advantage plans and carriers



If you need help comparing the two options or even plans within one of them, there's no cost for our assistance and we really do help people navigate all this new stuff:




In the meantime, you can look at what these options might cost you.


How should I compare and quote the Medicare options


It's easy. You can quote and compare the different options here:


Free California Medicare Quote
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Compare Medicare Advantage, Medigap & Part D from all major California carriers. Enter your doctors & medications for exact pricing - instantly.

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Don't forget Part D if you're getting a Medigap plan. Most Advantage plans over Part D already.


We looked at total expected cost between Advantage and Medicare supplements.


We're happy to run quotes across both suites for you. Just need date of birth and zip code at help@calhealth.net


We'll do all the running around!


What if you don't like the plan?

What if I don't like the Advantage or Medigap plan - Can I go back to Medicare by itself

Yes.


With medigap, you can cancel at any time during the year.


For Advantage or Part D, there are certain times you can cancel them and go back to traditional Medicare.


We looked at this in our Cancelling Advantage to go back to Medicare.


Worst case, you're looking at end of the year during Annual Open Enrollment (Oct 15th - Dec 7th).


Again, for medicare supplements, you can cancel those month to month any time and you can change plans around your Birthday (worst case). See the Birthday Rule for more info.

how to use the California medigap birthday rule to switch plans


We can help with any questions! Reach out to us at 800-320-6269 or help@calhealth.net


Frequently Asked Questions
▸ Is it necessary to have a Medicare Supplement in California?
Medicare by itself leaves significant cost gaps - including hospital deductibles and no out-of-pocket maximum - that can add up quickly if you face a serious illness or extended hospital stay. Most California residents on Medicare choose either a Medigap (Medicare Supplement) plan or a Medicare Advantage plan to help cover those gaps. Whether a Supplement is right for you depends on your health, budget, and how you use medical care.
▸ What happens if I just have Original Medicare and no supplement?
Original Medicare alone has no cap on what you can owe out-of-pocket in a given year, meaning a serious hospitalization or ongoing specialist care could result in substantial uncovered costs. Many people find this out the hard way after a health event - which is why understanding the gaps before you need care is so important. Speaking with a licensed agent can help you weigh the risks against the cost of supplemental coverage.
▸ What is the least expensive way to cover the gaps in Medicare?
Medicare Advantage plans often have lower or no monthly premiums compared to Medigap, making them a popular lower-cost option, though they typically use provider networks and may have copays at the point of service. Medigap plans carry a monthly premium but can offer more predictable out-of-pocket costs and broader provider access. The best fit depends on your health needs, preferred doctors, and budget - a current Medicare quote can help you compare real options.
▸ How does the California Birthday Rule affect Medicare Supplement plans?
California's Birthday Rule gives Medigap enrollees a 60-day window around their birthday each year to switch to an equal or lesser-benefit Medicare Supplement plan from any carrier without medical underwriting. This is a significant California-specific protection that lets residents shop for better pricing annually without risking denial based on health history. Learn more about when you can switch Medigap plans in California.
▸ Can I go back to Original Medicare if I don't like my Advantage or Medigap plan?
You can generally return to Original Medicare from a Medicare Advantage plan during certain enrollment windows, but getting back into a Medigap plan afterward may require medical underwriting in most situations (California's Birthday Rule provides one annual exception for Medigap-to-Medigap switches). Timing and eligibility rules are nuanced and change, so it's worth speaking with a licensed agent before making any switch. CalHealth.net agents help Californians statewide navigate these decisions at no cost to you.
The answers above are general information about California health insurance and may change as rates, plans, and rules are updated each year. They are not a substitute for personalized advice. For current, personalized guidance, please contact us, email help@calhealth.net, or call 800-320-6269. Serving California since 1994.
Free California Medicare Quote
Google ★★★★★ 5.0
⚡ Free & Instant

Compare Medicare Advantage, Medigap & Part D from all major California carriers. Enter your doctors & medications for exact pricing - instantly.

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Serving California since 1994 · Certified Medicare agents · Zero cost