
Medicare is a federal government health insurance program that provides healthcare coverage for people aged 65 or older, or those who receive Social Security Disability Insurance (SSDI) or have End-Stage Renal Disease (ESRD), regardless of age. When Medicare is an individual's primary insurance, it pays up to the limits of its coverage, and any additional insurance covers the remaining balance. However, Medicare may also be the secondary payer in certain situations, such as when an individual has group insurance through their employer or union. In such cases, Medicare covers any remaining costs not covered by the primary insurance. It's important to understand the coordination of benefits rules to know which insurance pays first and to ensure correct payment of claims.
| Characteristics | Values |
|---|---|
| When Medicare is the primary payer | Medicare pays first up to the limits of its coverage. |
| When Medicare is the secondary payer | Medicare pays only if there are costs the primary insurer didn't cover. |
| Medicare as the primary payer for End-Stage Renal Disease (ESRD) patients | Medicare is the primary payer for ESRD patients, regardless of their age or work status. |
| Medicare Advantage | Medicare Advantage plans expand coverage beyond Original Medicare, often with extra benefits. |
| Medicare and employer insurance | If your employer has 20 or more employees, the group insurance plan is usually the primary payer while you are still working, and Medicare is secondary. |
| Medicare and TRICARE | If you're on active duty, TRICARE pays first for Medicare-covered services, and Medicare pays second. If you aren't on active duty, Medicare pays first, and TRICARE may pay second. |
| Medicare and no-fault or liability insurance | If you have a no-fault or liability insurance claim, your provider must try to get paid by the insurance company before billing Medicare. |
| Medicare and workers' compensation | Medicare can't pay for items or services that workers' compensation will pay for promptly. |
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What You'll Learn
- Medicare is the primary payer when it's your only insurance
- Medicare is usually primary with employer-group insurance
- Medicare is secondary to group insurance if the employer has 20+ employees
- Medicare may be primary for those under 65 with End-Stage Renal Disease
- Medicare is secondary for services it doesn't cover, like dental care

Medicare is the primary payer when it's your only insurance
If Medicare is your only insurance, it is considered your primary insurance and will pay up to the limits of its coverage. This is known as the "primary payer".
When Medicare is the primary payer, it covers the costs of Medicare-covered services first, and if there are any remaining costs, you may be responsible for covering them. For example, if you receive services from a non-VA hospital that were not authorized by the VA, Medicare may pay for any Medicare-covered services that the VA did not authorize. Similarly, if you are on active duty and have Medicare, TRICARE pays first for Medicare-covered services, and Medicare pays second.
In some cases, Medicare may make a conditional payment if another insurance company denies payment for your medical bills. This could occur if you have coverage through workers' compensation, for instance. However, Medicare must be repaid from the Workers' Compensation Medicare Set-Aside Arrangement if it pays for claims related to your workers' compensation settlement.
It is important to note that Medicare does not automatically know if you have other coverage. Therefore, it is your responsibility to inform your doctor and other healthcare providers about any additional insurance you may have. This will help ensure that your bills are sent to the correct payer and avoid any delays or issues with payment.
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Medicare is usually primary with employer-group insurance
Medicare is a form of health insurance for individuals aged 65 or older. However, individuals under 65 may also be eligible for Medicare if they have a disability. In some cases, individuals may have Medicare as well as other health insurance, such as employer-group insurance.
When an individual has multiple insurance coverages, one insurance is considered the "primary payer", while the other is the "secondary payer". The primary payer pays up to the limits of its coverage, after which the secondary payer covers the remaining balance.
Medicare is usually the primary payer if the employer has fewer than 20 employees. In this case, Medicare pays first, and the non-tribal group health plan pays second. However, Medicare becomes the secondary payer if the employer is part of a group health plan with more than 20 employees. Here, the group health plan is the primary payer, and Medicare pays out only after the employer's plan has paid its portion.
It is important to note that these rules may vary depending on the specific situation. For example, Medicare cannot pay for items or services that workers' compensation will pay for promptly. Additionally, if an individual has TRICARE, a program that provides expanded medical coverage to uniformed services retirees, their Medicare drug plan will pay first, and TRICARE will pay second.
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Medicare is secondary to group insurance if the employer has 20+ employees
When an individual has Medicare and other health insurance, 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". If the "secondary payer" doesn't cover the remaining balance, the individual may be responsible for the remaining costs.
Medicare is the primary payer if the employer has fewer than 20 employees and for retiree or COBRA coverage for all size employers. If you have non-tribal group health plan coverage through an employer with 20 or more employees, the non-tribal group health plan pays first, and Medicare is the secondary payer. This means that the employer group health plan is the primary payer when coverage is due to an employee's (or their spouse's) current employment status, and the employer has 20 or more employees.
It is important to note that Medicare Secondary Payer (MSP) rules prohibit employers from offering any "financial or other incentives" to individuals entitled to Medicare to not enroll or terminate enrollment under an employer group health plan that would otherwise be the primary payer. However, employers can provide information and educational resources to employees about this topic.
In certain cases, employers with fewer than 20 employees can offer a payment plan that reimburses Medicare Part B or Part D premiums if it is "integrated" with a group health plan. This is an exception for Individual Coverage Health Reimbursement Arrangements (ICHRAs), which are subject to their own compliance requirements.
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Medicare may be primary for those under 65 with End-Stage Renal Disease
When you have more than one insurance plan, it's important to know which one is the "primary payer" and which is the "secondary payer". The primary payer pays up to the limits of its coverage, and the secondary payer covers any remaining costs that the primary insurance didn't cover.
If you are under 65 and have End-Stage Renal Disease (ESRD), you may be eligible for Medicare as your primary insurance. ESRD is a condition where your kidneys have permanently failed, and you require long-term dialysis or a kidney transplant. If you have ESRD and meet certain requirements related to Social Security or Railroad Retirement benefits, you may qualify for Medicare Part A and Part B, which can cover certain dialysis and kidney transplant services.
Medicare coverage for ESRD typically starts during dialysis treatment or when you are admitted to a hospital for a kidney transplant. If you are receiving dialysis treatment at a dialysis facility, Medicare coverage usually begins in the fourth month. However, if you undergo dialysis training at home or start training within the first three months of dialysis, coverage can start as early as the first month. If you are awaiting a kidney transplant, Medicare coverage can begin two months before the transplant if there are delays.
It's important to note that if you only have Medicare due to ESRD, your coverage will end 12 months after you stop dialysis treatments or 36 months after a successful kidney transplant. Additionally, Medicare is the secondary payer to group health plans (GHPs) for individuals with ESRD for a coordination period of 30 months, regardless of the number of employees or employment status.
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Medicare is secondary for services it doesn't cover, like dental care
When Medicare is your primary insurance, it will cover a range of healthcare services and items. However, there are certain services that Medicare does not cover, such as dental care, concierge medicine, and certain vision and hearing services. In these cases, where Medicare is your primary insurance, it will not pay for any costs associated with these excluded services.
Medicare's coverage of dental services is limited. It typically does not cover routine dental care, including cleanings, fillings, tooth extractions, or dentures and implants. However, there are some exceptions where Medicare may provide coverage for specific dental services. For example, if you require dental services due to an underlying medical condition or if the dental procedure is integral to the success of another covered medical treatment, Medicare may pay for these services under Part A and Part B. This coordination of benefits ensures that you receive the necessary care, even if it falls outside the scope of standard Medicare coverage.
Medicare Advantage Plans (Part C) or Medicare Cost Plans may offer additional benefits that Original Medicare does not, including coverage for certain dental, vision, and hearing services. These plans can provide more comprehensive coverage, filling in the gaps where Medicare is secondary or does not apply. It is important to carefully review the details of these plans to understand the specific services they cover and any associated costs.
When Medicare is your primary insurance, it acts as the "primary payer." This means that Medicare will pay for covered services up to the limits of its coverage. If there are any remaining costs that your primary insurance does not cover, that's when a secondary insurance plan, or "secondary payer," may come into play. The secondary payer will pay for any additional costs that your primary insurance doesn't cover. However, if the secondary payer doesn't cover all the remaining costs, you may be responsible for paying the remaining balance.
It is important to note that Medicare does not automatically know if you have other insurance coverage. Therefore, it is your responsibility to inform your healthcare providers if you have coverage in addition to Medicare. This information will help them send your bills to the correct payer and avoid delays in reimbursement. Additionally, if you have specific questions about your coverage or need assistance selecting the right plan, you can consult licensed sales agents or seek advice from your healthcare provider.
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Frequently asked questions
No, Medicare is always the primary payer when it is your only form of insurance. When you have additional insurance, predetermined coordination of benefits rules come into play to determine which form of coverage is primary and which is secondary.
The "'primary payer" pays what it owes on your bills first, up to the limits of its coverage. Then, the remaining balance is sent to the "secondary payer" to pay.
If your employer has less than 20 employees, Medicare is typically the primary payer. If your employer has 20 or more employees, the group insurance plan is usually the primary payer while you are still working.
If your spouse's employer has more than 20 employees, the group coverage provided is typically your primary insurance. You may be able to delay enrolling in Medicare Part B without facing penalties.
If you are under 65 and have ESRD, Medicare may be your primary payer even if you have group health coverage through a larger employer. Medicare coverage is available to patients with ESRD regardless of age.











































