Medicare eligibility in California follows the same federal rules used nationwide: you qualify at age 65 if you are a U.S. citizen or a lawful permanent resident who has lived in the country for at least five continuous years, and you can qualify earlier through certain disabilities. What changes when you live in California is the help available on top of Medicare, including Medi-Cal for people who qualify for both programs, Medicare Savings Programs with no asset test, a Medigap birthday rule, and free counseling through HICAP.
Who Qualifies at 65
The most common path is turning 65. If you or your spouse paid Medicare taxes for at least 40 calendar quarters, roughly ten years of work, you get Part A hospital insurance with no monthly premium.1Centers for Medicare & Medicaid Services. Original Medicare (Part A and B) Eligibility and Enrollment Fall short of 40 quarters and you can still buy Part A, but you will pay up to $565 per month in 2026.2Medicare. 2026 Medicare Costs Part B is available to anyone who meets the citizenship or residency rule, at a standard monthly premium of $202.90 in 2026.3Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
Qualifying Before Age 65
Two situations open Medicare earlier. If you have received Social Security Disability Insurance benefits for 24 consecutive months, you are automatically enrolled once the waiting period ends.4Medicare.gov. I’m Getting Social Security Benefits Before 65 If you are diagnosed with ALS, there is no waiting period; coverage begins the same month your disability benefits start.
People with End-Stage Renal Disease who are on dialysis or have received a kidney transplant also qualify, though they must meet certain work-history or benefit-eligibility conditions.1Centers for Medicare & Medicaid Services. Original Medicare (Part A and B) Eligibility and Enrollment
When and How to Sign Up
Initial Enrollment Period
Your first chance to sign up is a seven-month window that begins three months before the month you turn 65, includes your birthday month, and continues three months after.5Medicare. When Does Medicare Coverage Start Signing up during the first three months of this window gets coverage started earliest. Waiting until the months after your birthday delays when coverage kicks in. You enroll through the Social Security Administration, and the fastest method is applying online at ssa.gov.6Social Security Administration. Sign Up for Medicare
Special Enrollment Period for Workers
If you are still working at 65 and covered by your employer’s group health plan, you do not need to enroll in Part B right away. Once that employment or group coverage ends, whichever happens first, you get an eight-month Special Enrollment Period to sign up without penalty.
This is where people trip up badly. COBRA and retiree health plans do not count as coverage based on current employment. If you retire, switch to COBRA, and assume you are protected, you are not. Your eight-month SEP clock starts running from the date your employment or employer coverage ended, regardless of whether COBRA is still paying claims.7Social Security Administration. Special Enrollment Period (SEP) Once you are eligible for Medicare, your COBRA plan may pay only a small portion of your medical costs and leave you responsible for the rest.8Medicare. COBRA Coverage Miss the eight-month window and you face a gap in coverage plus a permanent penalty.
General Enrollment Period
If you miss both your Initial Enrollment Period and any Special Enrollment Period, you can sign up for Part A and Part B between January 1 and March 31 each year. Coverage begins the month after you enroll.5Medicare. When Does Medicare Coverage Start Late enrollment penalties will likely apply.
What Late Enrollment Costs You
Missing your enrollment window does more than delay coverage. It permanently increases what you pay, for as long as you have that coverage, which for most people means the rest of their life.9Medicare. Avoid Late Enrollment Penalties
The Part B penalty adds 10% to your premium for every full 12-month period you were eligible but did not enroll. Wait three years and you pay a 30% surcharge on the standard $202.90 premium, an extra $60.87 every month, permanently.9Medicare. Avoid Late Enrollment Penalties
The Part D penalty adds 1% of the national base beneficiary premium ($38.99 in 2026) for each month you went without creditable drug coverage. Fourteen months uncovered translates to roughly $5.50 added to your monthly Part D premium, and the amount recalculates each year as the base premium changes.9Medicare. Avoid Late Enrollment Penalties Small in any single month, these penalties compound across a retirement that could span 20 or 30 years.
California Programs That Lower Your Costs
Medicare Savings Programs With No Asset Test
California administers three federal Medicare Savings Programs that help lower-income residents pay Medicare premiums and cost-sharing. Since January 1, 2024, the state has eliminated the asset test for all three. You can have any amount in savings, real estate, or other assets and still qualify. Only your income matters.10California Department of Health Care Services. Medicare Savings Programs in California
The Qualified Medicare Beneficiary program is the most comprehensive. It pays your Part A and Part B premiums, deductibles, coinsurance, and copays, and you have no legal obligation to pay any Medicare cost-sharing. The 2025 income limit is $1,305 per month for an individual or $1,763 for a couple.11Medicare.gov. Medicare Savings Programs10California Department of Health Care Services. Medicare Savings Programs in California
The Specified Low-Income Medicare Beneficiary program covers your Part B premium only. The 2025 income limit is $1,566 per month for an individual or $2,116 for a couple.10California Department of Health Care Services. Medicare Savings Programs in California
The Qualifying Individual program also covers your Part B premium at a slightly higher threshold: $1,762 per month for an individual or $2,381 for a couple in 2025.10California Department of Health Care Services. Medicare Savings Programs in California
Income limits update annually, and certain deductions may apply when eligibility is determined, so you could qualify even if your gross income slightly exceeds the listed thresholds. Qualifying for any of these programs also automatically enrolls you in Extra Help, which cuts your Part D prescription drug costs to no more than $12.65 per covered medication in 2026.11Medicare.gov. Medicare Savings Programs
Medi-Cal for Dual-Eligible Beneficiaries
California residents who qualify for both Medicare and Medi-Cal receive coverage from both programs simultaneously. Medi-Cal fills in gaps that Medicare does not cover, including dental care, vision, hearing aids, and long-term care services. Medi-Cal also helps cover Medicare cost-sharing like premiums and copays. If you qualify for a Medicare Savings Program, you may also qualify for full Medi-Cal benefits depending on your income.
The Medigap Birthday Rule
If you go with Original Medicare, a Medigap policy from a private insurer can fill in your deductibles, coinsurance, and copays. Your best window to buy is the six-month Medigap Open Enrollment Period, which starts the first day of the month you turn 65 and are enrolled in Part B. During that window, insurers must sell you any policy they offer at the standard price, with no medical underwriting.12Medicare.gov. When Can I Buy a Medigap Policy
California adds a protection that most states do not offer. Every year around your birthday, you get a 30-day window to switch to any Medigap plan with equal or lesser benefits from any insurer, without medical underwriting. The window opens 30 days before your birthday and closes 30 days after. If a competitor offers a lower rate on the same plan letter, you can move without being denied for health conditions. Comparison-shopping your Medigap premium annually is worth the hour.
Medigap plans do not cover prescription drugs, so you will need a standalone Part D plan alongside your Medigap policy.
Free Help From HICAP
California’s Health Insurance Counseling and Advocacy Program provides free, one-on-one help with Medicare decisions. HICAP counselors do not sell insurance. They can help you compare plans, understand your benefits, apply for cost-saving programs, and resolve billing problems, and the program also provides legal assistance with Medicare-related disputes. Reach HICAP at 1-800-434-0222 or find a local office through the California Department of Aging website.13California Department of Aging. Medicare Counseling (HICAP) Counseling is available to anyone currently on Medicare, approaching eligibility, or under 65 with a disability.