Operated by HealthBenefitsCompass LLC, a subsidiary of HealthcareGPS Inc.Medicare education · Not a government websiteReviewed by Lauri Middleton, RN, MSN (licensed Medicare agent) and Karen OrillaHow we prepare our guidance →Meet our reviewers →

Reviewed for accuracy by Lauri Middleton, RN, MSN, licensed Medicare agentReviewed for clarity by Karen OrillaMeet our reviewers →

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California Medicare Guidance

Is Medicare Advantage really free?

Some plans have a $0 monthly premium, but you still pay the Part B premium, and you pay copays or coinsurance each time you use care, up to a yearly out-of-pocket maximum. The plan may also require you to use its network and get referrals. Compare the whole year — premium plus what you would pay when sick — not the monthly number alone.

Apply this to my situation
Medigap fills Original Medicare’s gaps — and has its own six-month windowEffective 2026 · Last checked 2026-09-05

A Medigap (Medicare Supplement) policy is private insurance that pays some of what Original Medicare does not, such as coinsurance and deductibles. Plans are standardized by letter. Your best guaranteed chance to buy one is the six months starting when you are 65 or older and enrolled in Part B; after that, an insurer can often ask health questions and charge more or refuse.

Who this is for

People choosing Original Medicare.

What changes it

  • Medigap cannot be used with a Medicare Advantage plan.
  • California adds its own rights; see the California rules.

The question that settles it

“When does my six-month Medigap open enrollment start and end?” — HICAP or the California Department of Insurance.

Source: Medicare.gov — Your Medicare coverage options ↗

October 15 to December 7: the yearly window to change plansEffective 2026 · Last checked 2026-09-05

Every year during Open Enrollment you can switch between Original Medicare and Medicare Advantage, change Medicare Advantage plans, or join, drop or change a drug plan. Changes take effect January 1.

Who this is for

Everyone who already has Medicare.

What changes it

  • Switching from Medicare Advantage back to Original Medicare does not by itself guarantee a Medigap policy; see the Medigap rule.

The question that settles it

“If I make this change by December 7, exactly what will my coverage be on January 1?” — Medicare Plan Finder or HICAP.

Source: Medicare.gov — Open Enrollment ↗

Get help

Free Medicare counseling

California HICAP offers free, confidential Medicare counseling. Ask the local program about language and appointment availability.

California HICAP

1-800-MEDICARE

Call 1-800-MEDICARE and ask for an interpreter. TTY: 1-877-486-2048.

Call Medicare · 1-800-633-4227Official information in other languages ↗

External resource. Some pages are in English; ask for language assistance if needed.