Is Medicare Part B always primary?

Asked by: Christina Schmidt  |  Last update: October 16, 2025
Score: 4.6/5 (65 votes)

While Original Medicare usually is the primary insurance, there are some instances when a supplement to Medicare is secondary. Two common instances are: If you have job-based insurance from an employer with 20 or more employees. This is the case whether you get insurance through your company or your spouse's employer.

How do I know if my Medicare is primary or secondary?

When is Medicare primary or secondary?
  1. Medicare is the primary payer if the employer you work for has less than 20 employees. Your employer health insurance pays second.
  2. Medicare is the secondary payer if your company has more than 20 employees. Your employer plan would pay first.

Is Medicare supposed to be primary or secondary?

Medicare pays first, and your (or your spouse's) group health plan pays second. Retiree coverage might not pay your medical costs during any period when you were eligible for Medicare but didn't sign up for it.

Can you have Medicare Part B and employer insurance at the same time?

Can I combine employer health insurance with Medicare? If you or your spouse are working and covered through an employer, you can also decide to keep this coverage and enroll in Original Medicare, Part A and/or Part B to get additional health coverage.

How do you determine which insurance is primary and which is secondary?

The insurance that pays first is called the primary payer. The primary payer pays up to the limits of its coverage. The insurance that pays second is called the secondary payer. The secondary payer only pays if there are costs the primary insurer didn't cover.

Is Medicare Primary or Secondary?

33 related questions found

Is Medicare always primary for retirees?

If you have both Medicare and retiree coverage from a former employer, generally Medicare pays first for your health care bills. Medicare will submit any amount it doesn't cover to your retiree plan.

What is the best secondary insurance if you have Medicare?

The best Medicare supplement plan providers
  • Best for extra plan benefits: Humana.
  • Best for straightforward coverage: State Farm.
  • Best for extensive medical care coverage: AARP by UnitedHealthcare.
  • Best for a range of Medigap plans: Blue Cross Blue Shield.

Do I need Medicare Part B if I have other insurance?

You can enroll in Medicare Part B if you have other insurance, but you don't have to. However, depending on your other insurance, it may benefit you to have both. This depends on the cost of your other insurance and how it works with Medicare.

What is the 8 month rule for Medicare?

Once you stop working (or lose your health insurance, if that happens first) you have an 8-month Special Enrollment Period (SEP) when you can sign up for Medicare (or add Part B to existing Part A coverage).

Will secondary pay if primary denies?

If your primary insurance denies coverage, secondary insurance may or may not pay some part of the cost, depending on the insurance. If you do not have primary insurance, your secondary insurance may make little or no payment for your health care costs.

Can you use Medicare and private insurance at the same time?

If you have Medicare and other health insurance (like from a group health plan, retiree coverage, or Medicaid), each type of coverage is called a "payer." The "primary payer" pays up to the limits of its coverage, then sends the rest of the balance to the "secondary payer."

How much does Medicare Part B pay for physician fees?

Medicare pays 80% of the approved charge. Either the patient or supplemental insurance pays the remaining 20% co-payment. No further payment is due to the physician. When a physician does not accept assignment, however, he or she may “balance bill” the patient above the Medicare approved charge.

Can I delay Medicare Part B if I am still working?

People with group health coverage based on current employment may be able to delay Part A and Part B. They won't have to pay a lifetime late enrollment penalty if they enroll later.

Does Medicare automatically become primary?

If you don't have any other insurance, Orignal Medicare will always be your primary insurance. In most cases, when you have multiple forms of insurance, Original Medicare will still be your primary insurance.

What happens to my younger wife when I go on Medicare?

Medicare is individual insurance, so spouses cannot be on the same Medicare plan together. Now, if your spouse is eligible for Medicare, then he or she can get their own Medicare plan.

Whose responsibility is it to determine if Medicare is the primary payer?

Any entity providing items and services to Medicare patients must determine if Medicare is the primary payer.

Does everyone have to pay $170 a month for Medicare?

Most people pay no premiums for Part A. For Medicare Part B in 2025, most beneficiaries will pay $185 per month. Certain factors may require you to pay more or less than the standard Medicare Part B premium in 2025.

What is the 2 2 2 rule in Medicare?

Introduced in the Fiscal Year 2014 Inpatient Prospective Payment System (IPPS) Final Rule, the two-midnight rule specifies that Medicare will pay for inpatient hospital admissions when a physician reasonably expects the patient's care to require a stay that crosses two midnights, and the medical record supports this ...

Do I need Medicare Part B if I have employer health insurance?

You may be required to get Medicare Part B even when you're still working. There are two situations in which you must get Part B when you turn 65. If your employer has fewer than 20 employees. If you're covered by a spouse's employer, and the employer requires covered dependents to enroll in Medicare when they turn 65.

What is the best Medicare plan that covers everything for seniors?

Original Medicare with Medigap likely offers the most comprehensive coverage, but it may also be the most costly. A person can consider their income and how much they are able to spend before choosing a Medicare plan. Original Medicare with Medigap also offers a lot of flexibility when choosing a doctor or specialist.

What are the 6 things Medicare doesn't cover?

Some of the items and services Medicare doesn't cover include:
  • Eye exams (for prescription eyeglasses)
  • Long-term care.
  • Cosmetic surgery.
  • Massage therapy.
  • Routine physical exams.
  • Hearing aids and exams for fitting them.

Why would you decline Medicare Part B?

Some people do not take Part B during their Initial Enrollment Period (IEP) because they have primary insurance from their current employer or their spouse's current employer. The IEP is the first time you can sign up for Medicare.

Why are people leaving Medicare Advantage plans?

Key takeaways: People leave Medicare Advantage plans because out-of-pocket costs vary between plans, network restrictions can cause frustration, prior authorization requests can delay care, and it can be difficult to use the additional benefits they provide.

What is the waiting period for preexisting conditions with Medicare?

Do Medicare Supplement insurance plans cover preexisting conditions? Yes. However, a Medigap insurance company can refuse to cover pre‑existing conditions for up to 6 months after enrollment. This is called a “pre‑existing condition waiting period.” After 6 months, the Medigap policy will cover those conditions.