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UniHealth

All Santa Clara programs

Medicare and other health coverage coordination

Coordinates Medicare timing, payer order, and drug coverage across current-employer plans, COBRA, retiree coverage, ACA Marketplace coverage, VA health care, and TRICARE.

Health coverage · Santa Clara County · Reviewed 2026-09-04

A directory listing, not an eligibility decision.

UniHealth can identify a possible match, but the responsible program makes the final decision.

What to know

Why it may fit
Your circumstances can be checked against the program’s published guidelines.
What to do next
The rules for when to sign up for Medicare if you have other coverage. This includes job, retiree, COBRA, Covered California, VA, or TRICARE coverage.
Who runs it
Social Security / CMS

What the program may consider

  • Medicare entitlement or upcoming age-65 window
  • Current-employer, retiree, COBRA, Marketplace, VA, TRICARE, or other coverage
  • Eight-month Part B Special Enrollment Period when active-employment coverage ends
  • Entitlement reason, ESRD coordination period, employer size, and coverage type determine who generally pays first
  • Creditable drug coverage and Part D timing across each kind of coverage you have

How to get it

The rules for when to sign up for Medicare if you have other coverage. This includes job, retiree, COBRA, Covered California, VA, or TRICARE coverage.

How to apply

Sign up for Medicare Part A and Part B

Social Security handles Medicare sign-up. People who already get Social Security are signed up on their own.

The same application can also ask for Original Medicare.

Getting help

Someone can apply for you

A helper can fill out the forms with you. You sign the Part B form yourself. Your employer fills out and signs its part of form CMS-L564.

A helper can fill it out, but you still sign.

What happens after you apply

  1. Ask the benefits office if your coverage comes from a current job. Ask how many workers the employer has.

    YouA helper can help with this

  2. At 65 or older, if the employer has 20 or more workers, the job plan pays first. With fewer workers, Medicare pays first. Then your job plan may not pay unless you have Part A and Part B.

    YouA helper can help with this

  3. COBRA and retiree coverage do not count as job coverage. They do not give you a later window to sign up. If you wait, a late fee can last for life.

    If you have COBRA or retiree coverage

    YouOnly you can do this

  4. Once you can get free Part A, you lose help paying for your Covered California plan. If you keep getting that help, you may have to pay it back at tax time. End the plan when Medicare starts.

    If you have Covered California

    YouOnly you can do this

  5. Ask your employer to fill out form CMS-L564. It shows you had job coverage.

    When the job or the job coverage ends

    YouA helper can help with this

  6. Send form CMS-40B with the CMS-L564 to Social Security, or sign up online.

    Social SecurityA helper can help with this Within 8 months after the job or the job coverage ends, whichever comes first.

  7. Keep letters that say your drug coverage is as good as Medicare's. If you lose it, you have 2 full months to join Medicare drug coverage. Which plan is your choice. HICAP gives free, unbiased help.

    YouA helper can help with this

  8. Medicare and VA do not pay for the same care. You choose which to use each time. VA care does not give you a later window to sign up. TRICARE and CHAMPVA need both Part A and Part B to keep your coverage. TRICARE pays after Medicare unless you are on active duty.

    If you have VA, TRICARE or CHAMPVA coverage

    YouOnly you can do this

  9. Part B starts the month after Social Security gets your forms. If you sign up while still covered, you can ask to start up to 3 months later.

    Medicare

What only you can do

  • Decide when to take Part B. It depends on the kind of coverage you have.
  • Sign form CMS-40B yourself.
  • Ask your employer to complete form CMS-L564.
How long it takes
Part B starts the month after Social Security gets your forms. While still covered, you can pick a start up to 3 months later.
You are enrolled when
You are enrolled when your Medicare card or letter shows Part B. Its start date should leave no gap in coverage.
To keep it
Keep proof of your job coverage and your drug coverage. You may need it later to avoid late fees.