How to Compare Medicare Advantage Plans in California: 2026 Guide
"Aren't all Medicare Advantage plans basically the same?" It is one of the most common questions we hear, and the short answer is no. In a single California county, you can find dozens of Medicare Advantage plans, and each one covers your drugs, your doctors, and your extra benefits differently. Picking the wrong one is not a disaster, but it can quietly cost you money and convenience for an entire year.
This article walks through the five factors that actually matter when comparing plans, and how to use free tools to do it before Annual Enrollment (AEP) opens on October 15.
Why Compare Every Year, Not Just at 65
Many people choose a plan when they turn 65 and never look at it again. The problem is that plans change every year: premiums can rise, a drug can move to a more expensive tier, or a doctor can drop out of the network. Reviewing your plan every year during AEP, even if you end up keeping it, makes sure it is still the best option for you in 2027, not just the one you picked years ago.
For the basics of how these plans work, see our guide to Medicare Advantage in California.
The Five Factors Worth Comparing
1. Premium and Out-of-Pocket Maximum
Many Medicare Advantage plans in California offer a $0 monthly premium, but that does not mean they are free. Check the deductible, the copay for doctor visits, and the annual out-of-pocket maximum, which is your worst-case cap for the year.
2. Drug Coverage (Formulary)
Every plan has its own formulary, the list of covered drugs and the cost tier for each one. A drug one plan covers cheaply, another plan might place in a much more expensive tier. Before you compare, have your exact drug list ready, with dosages and frequency.
3. Provider Network
If you have a trusted doctor or specialist, confirm they are in the plan's network before you enroll. HMO plans generally require you to stay within the network, while PPO plans give you more flexibility to see out-of-network specialists, usually at a higher cost.
4. Extra Benefits
Dental, vision, hearing, gym membership, and transportation to medical appointments vary widely from plan to plan. If any of these matter to you, do not assume every plan covers them the same way. Our guide to Medicare costs in 2026 explains how these benefits affect your annual budget.
5. Star Rating
CMS rates every Medicare Advantage plan from 1 to 5 stars across nearly 40 quality measures: preventive care, chronic condition management, member experience, and customer service. For 2026, the average rating is close to 4 stars, and two-thirds of enrollees are in plans rated 4 stars or higher. If a 5-star plan is available in your county, you can switch into it at any time of year through a special enrollment period that runs December 8 through November 30.
Before you compare, have ready:
- Your current drug list, with dosages
- Your main doctors' and specialists' names
- Your current premium and deductible, for comparison
- The extra benefits you use most
Free Tools to Compare Plans
The Medicare Plan Finder at Medicare.gov lets you enter your zip code and your medications to see the estimated cost of every plan available in your county. It is free and does not require talking to an agent to start comparing.
Tip: You can also work with a licensed Medicare agent at no cost to you. Agents are paid by insurance companies, not by you, and can compare plans across multiple carriers based on your specific drugs and doctors.
Medicare Advantage or Medigap?
While comparing, it is also worth asking whether Medicare Advantage is the right path for you, or whether a Medigap (Medicare Supplement) plan fits your lifestyle better. Medicare Advantage typically has lower premiums and extra benefits but limits you to a provider network. Medigap gives you freedom to use any doctor who accepts Medicare, with more predictable costs, but usually costs more per month and does not include extra benefits.
When to Start Comparing
The ideal time to start is July or August, before Annual Notice of Change letters arrive in September. That way, by the time AEP opens October 15, you already know exactly what you are looking for and can act with confidence instead of rushing. If you prefer to read this in Spanish, or are helping a family member who does, our sister site Medicare California covers the same plan comparison topics in English.
Want help comparing your options?
A licensed specialist can compare plans based on your specific drugs and doctors, at no cost and no pressure.
Talk to a Free AgentFrequently Asked Questions
How often should I compare my Medicare Advantage plan?
Every year, during AEP from October 15 to December 7. Plans can change their premium, drugs, network, and benefits each year.
What are the most important factors when comparing plans?
Premium and out-of-pocket maximum, drug coverage, provider network, extra benefits, and star rating.
What is the Medicare Plan Finder?
A free tool at Medicare.gov that compares plans available in your county using your zip code and medications.
What is the difference between Medicare Advantage and Medigap?
Medicare Advantage has low premiums, a provider network, and extra benefits. Medigap lets you use any doctor who accepts Medicare, with more predictable costs but higher premiums.
Can I switch plans every year?
Yes, during AEP from October 15 to December 7. Changes take effect January 1.
One More Thought
Comparing plans does not have to take all day. With your drug list and doctors in hand, and the Medicare Plan Finder or a trusted agent, you can get a clear comparison in under an hour. That time can save you hundreds of dollars and prevent coverage surprises in the new year.