California Medicare Part C 2027

Big insurers across the U.S. are scaling back PPOs and withdrawing from some counties for 2027. Californians should look over their Annual Notice of Change, and if a non-renewal letter showed up, enroll in a new plan before December 31, 2026.

Source: CMS 2027 landscape data as reported by Becker’s, October 1, 2026, and company announcements. Wellmark, Blue Cross Blue Shield of North Dakota and Blue Cross Blue Shield of Mississippi are also exiting Medicare Advantage for 2027.

Medicare Advantage, also called Part C, is a way to get your Medicare benefits through a private insurance company approved by Medicare. The plan covers everything Original Medicare Part A and Part B cover, except hospice care, which Original Medicare still pays. Most plans also include Part D drug coverage, and many may add extras such as routine dental, vision and hearing benefits.

In exchange, Medicare Advantage plans generally use networks of doctors and hospitals, and may require referrals or prior authorization for some services. Every Medicare Advantage plan has a yearly out-of-pocket maximum for covered medical care, which Original Medicare does not have. You keep paying your Part B premium, plus your plan’s premium if it has one.

If you prefer Original Medicare, a Medicare Supplement (Medigap) plan pays some or all of what Medicare leaves behind, and lets you see any provider in the U.S. that accepts Medicare. Benefits are standardized by plan letter, so compare prices for the same letter across insurers.

Medigap benefits are standardized by plan letter. Prices vary by insurer, age, ZIP code and tobacco use.

In California, anyone remaining on Original Medicare should consider a separate Part D plan. The 2027 Part D plan finder compares plans based on the precise medications you take and the pharmacies you rely on.

If your plan will not be offered in your county for 2027, you should have received a non-renewal notice in early October. Your coverage does not stop right away: it continues through December 31, 2026, so you have time to choose.

Special Needs Plans (SNPs) are Medicare Advantage plans built for specific groups. Benefits, networks and drug lists are designed around the members they serve, and many include care coordinators. For 2027, Special Needs Plans are one of the few areas where large insurers are adding plans, even as they cut PPOs.

If you turn 65 in 2027, your Initial Enrollment Period lasts seven months: the three months before your birthday month, your birthday month and the three months after. Signing up during the first three months means your coverage starts on the first day of your birthday month.

If your income and savings are limited, two programs can cut your Medicare costs sharply:

Those who are eligible for Medicare along with full Medicaid might also have the option of enrolling in a Dual Special Needs Plan. Learn more about help for low-income Part D beneficiaries.

California’s State Health Insurance Assistance Program, HICAP (Health Insurance Counseling and Advocacy Program), offers free, unbiased Medicare counseling. You can also call 1-800-MEDICARE any time or compare plans with a licensed agent at no cost.

Before any call, have your Medicare card, your list of drugs and doses, your doctors and your preferred pharmacies ready. It turns a long conversation into a short one.

Plans must send the Annual Notice of Change by September 30. It is the single most useful document you get each fall, because it tells you exactly how your plan changes on January 1.

Outside the fall and early-year windows, you generally need a Special Enrollment Period to change plans. Common reasons include:

Each Special Enrollment Period has its own time limit, so act as soon as the event happens.

Most Medicare Advantage plans require prior authorization for some services, such as certain surgeries, advanced imaging, skilled nursing stays and some drugs. Your doctor usually requests it, but ask whether a planned service needs approval so a denial does not surprise you.

If a request is denied, you or your doctor can appeal. Medicare rules set deadlines for plans to decide, with faster deadlines when waiting could seriously harm your health.

Every Medicare Advantage plan covers emergency care and urgent care anywhere in the U.S., in or out of network, and you do not need prior approval for an emergency. Routine care away from home is a different story: HMOs generally do not cover it, while PPOs cover out-of-network care at a higher cost.

If you spend months away from home each year, ask each plan how it handles care in your second location. It is one of the most common reasons people switch plans mid-year.

If your plan denies a service, a drug or payment for care, you have the right to appeal. The plan’s denial notice explains how. There are several levels of appeal, starting with the plan and moving to independent reviewers.

For problems that are not about coverage, such as customer service or wait times, you can file a grievance with the plan. You can also contact 1-800-MEDICARE or your State Health Insurance Assistance Program for help.

The Part B premium is the one big number not released with the plans. CMS normally announces it in November. The 2026 Medicare Trustees Report projects a 2027 standard premium of about $209.50 a month and a deductible of about $292, up from $202.90 and $283 in 2026. You keep paying it with Medicare Advantage.