
Medicare Part B is a type of insurance that covers outpatient services. When an individual has multiple forms of insurance, one insurance is the primary payer and pays up to the limits of its coverage, and the secondary payer covers the remainder. In most cases, Medicare is the primary payer. However, there are several factors that determine whether Medicare is the primary or secondary payer, including the size of the employer, the type of insurance, and the age of the individual.
| Characteristics | Values |
|---|---|
| If you have no other insurance | Original Medicare will always be your primary insurance |
| If you have multiple forms of insurance | Original Medicare will usually be your primary insurance |
| If your employer has fewer than 20 employees | Original Medicare will be your primary insurance |
| If you have a disability and are under 65, and your employer has fewer than 100 employees | Medicare will pay first |
| If you have amyotrophic lateral sclerosis (ALS) or end-stage renal disease (ESRD) | Original Medicare is the primary insurer if you've been eligible for Medicare for 24 months or more |
| If you have TRICARE and are on inactive duty | Original Medicare is the primary insurer |
| If you have Medicaid | Medicaid is always the secondary insurance if you have Medicare |
| If you have retiree insurance through a former company | Original Medicare is usually the primary insurer |
| If you have COBRA insurance | Original Medicare is the primary insurer |
| If you have primary insurance | It pays first for any healthcare services you receive |
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What You'll Learn
- Medicare as primary insurance for those with a disability
- Medicare as the primary payer for those with End-Stage Renal Disease (ESRD)
- Medicare as primary insurance for those with retiree coverage
- Medicare as primary insurance for those with COBRA insurance
- Medicare as primary insurance when the employer has fewer than 20 employees

Medicare as primary insurance for those with a disability
Medicare is a federal health insurance program primarily for people aged 65 and above. However, younger people with disabilities can also qualify for Medicare under certain conditions.
Medicare for People with Disabilities
People under 65 with disabilities can qualify for Medicare if they meet the following requirements:
- They have received Social Security Disability Insurance (SSDI) benefits for 24 months.
- They have been diagnosed with specific disabilities, such as Amyotrophic Lateral Sclerosis (ALS) or End-Stage Renal Disease (ESRD).
- They have a disability that meets the medical standards outlined by the Social Security Administration (SSA).
Medicare as Primary Insurance
If you have Medicare and other health insurance, each type of coverage is assigned a "payer" role. The "primary payer" pays up to the limits of its coverage and then sends the remaining balance to the "secondary payer."
For people with disabilities, Medicare is typically the primary payer in the following situations:
- If you are under 65 and have an employer-based health plan with fewer than 100 employees, Medicare pays first.
- If you have ALS or ESRD, Original Medicare is the primary insurer, provided you have been eligible for Medicare for 24 months or more.
- If you have TRICARE and are on inactive duty, Original Medicare is the primary payer.
- If you have Medicaid, it is always the secondary insurance, and Medicare pays first.
- If you have COBRA continuation coverage and your Medicare coverage is based on a disability, Medicare is the primary payer.
It is important to note that Medicare eligibility for working individuals with disabilities falls into three distinct time frames:
- The trial work period, which lasts for 9 months after a disabled individual obtains a job.
- The 93 months (7 years and 9 months) after the trial work period.
- An indefinite period following the 93 months.
During these periods, individuals must continue to meet the medical standard for being considered disabled under Social Security rules to maintain their Medicare coverage.
If you have questions about your specific situation, you can contact your insurance provider or Medicare's Benefits Coordination & Recovery Center (BCRC) for more information.
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Medicare as the primary payer for those with End-Stage Renal Disease (ESRD)
Medicare is the primary payer for those with End-Stage Renal Disease (ESRD) in certain circumstances. ESRD is a condition where a person's kidneys stop functioning permanently, requiring long-term dialysis or a kidney transplant to survive. If you have ESRD and meet specific criteria, you may be eligible for Medicare benefits.
Medicare is the primary payer for individuals with ESRD who have limited access to other insurance options. For those with ESRD, Medicare serves as the primary payer during the 30-month coordination period, even if they have a group health plan. This means that Medicare will pay for covered services first, and any remaining balance will be sent to the secondary payer, such as a group health plan. It's important to note that Medicare coverage for ESRD is not limited to kidney-related treatments but extends to all covered services.
If you have ESRD and are eligible for Medicare, signing up for Medicare Part B is crucial. Part B covers certain dialysis and kidney transplant services, so having both Parts A and B ensures access to the full range of benefits. Additionally, if you have a group health plan with a yearly deductible, copayment, or coinsurance, enrolling in Medicare can help cover those costs during the coordination period.
It's important to be mindful of timing when it comes to Medicare coverage for ESRD. Medicare coverage can start two months before the month of the transplant if the transplant is delayed by more than two months. For example, if a beneficiary starts pre-surgical health care services in July and the transplant is performed in September, the Medicare eligibility date would be July 1st. Medicare coverage for ESRD typically ends 12 months after stopping dialysis treatments or 36 months after a successful kidney transplant.
While Medicare is the primary payer for ESRD in most cases, there are situations where other insurance may take precedence. If you have job-based insurance from a company with 20 or more employees, Medicare typically becomes the secondary payer. Additionally, if you have retiree insurance or COBRA insurance, it's important to review the plan details to understand how it coordinates with Medicare.
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Medicare as primary insurance for those with retiree coverage
Medicare is the primary insurance for those with retiree coverage in most cases. If you have retiree coverage from a former employer and Medicare, Medicare typically pays first for your healthcare costs. Medicare will then submit any remaining balance to your retiree plan, which acts as the secondary payer.
However, it is important to note that some retiree insurance plans do not pay for medical costs if you are eligible for Original Medicare and do not enrol. Therefore, it is recommended to consult your retiree coverage plan to understand how it coordinates with Medicare. Additionally, when you become eligible for Medicare, enrolling in both Medicare Part A (Hospital Insurance) and Part B (Medical Insurance) may be necessary to receive the full benefits of your retiree coverage.
In certain situations, Medicare may not always be the primary payer. For example, if you are on active duty and have Medicare, TRICARE typically pays first for Medicare-covered services, with Medicare acting as the secondary payer. Similarly, if you have Medicaid, it is always the secondary insurance if you also have Medicare.
When determining the primary and secondary payers, it is important to communicate with your doctor and other healthcare providers about your coverage details. This ensures that your bills are sent to the correct payer and helps avoid delays in payment.
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Medicare as primary insurance for those with COBRA insurance
Medicare is a federal health insurance program for people over 65 or with disabilities. Original Medicare, which includes Parts A and B, covers a range of health services, but it doesn't pay for everything. When you have multiple forms of insurance, one is typically designated as the "primary payer" and the other as the "secondary payer." The primary payer pays up to the limits of its coverage, and the secondary payer covers any remaining costs.
If you have COBRA insurance and are eligible for Medicare but not enrolled, COBRA may only pay for a small portion of your healthcare services, leaving you to pay most of the costs. COBRA is a federal law that allows individuals to keep their employer's group health plan coverage for a limited time after their employment ends or if they lose coverage as a spouse or dependent of a covered employee.
If you have both Medicare and COBRA, Medicare is typically your primary insurance, and COBRA becomes the secondary payer. This means that Medicare will pay for services first, and your COBRA plan will help pay for any remaining costs. However, if you are eligible for Medicare based on living with end-stage renal disease (ESRD), COBRA pays first for the first 30 days you are enrolled in Medicare.
It is important to note that you can use COBRA and Medicare together to cover your health needs and those of your family. Depending on your plan, COBRA might cover services that Medicare doesn't, or it might offer them at a lower cost. When deciding whether to use COBRA, Medicare, or both, consider your budget, medical needs, and family situation. Additionally, if you have COBRA before signing up for Medicare, your COBRA coverage will likely end once you enrol in Medicare. You have up to eight months after losing your health insurance to sign up for Medicare Part B without a penalty.
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Medicare as primary insurance when the employer has fewer than 20 employees
Medicare is a US federal health insurance program for people over 65, under 65 with a disability, and people of all ages with End-Stage Renal Disease (ESRD) or Amyotrophic Lateral Sclerosis (ALS). Original Medicare is often the primary insurance for those with multiple forms of insurance.
If your employer has fewer than 20 employees, Original Medicare is your primary insurance, and your group insurance plan is secondary. This means that Medicare pays first, up to the limits of its coverage, and then sends the rest of the bill to your group insurance plan. In this case, you should enrol in Medicare Part B during your Initial Enrollment Period to avoid a late enrollment penalty. If you miss this chance, your premiums will increase by 10% every year that you delay enrollment.
If you have job-based insurance from a company with fewer than 20 employees, you must enrol in Medicare Part B. This is because, in groups with less than 20 employees, the government considers Medicare the employee's primary insurance and the employer-provided insurance as secondary coverage. Medicare Part B is a medical insurance plan that covers services like doctor visits, outpatient care, and durable medical equipment.
There are some exceptions to the rule that Medicare is the primary insurance for employers with fewer than 20 employees. For example, if you are under 65 and your employer-based health plan has fewer than 100 employees, Medicare will pay first. Additionally, if you have retiree insurance through a former company, Original Medicare may be your primary insurance, but some retiree insurance plans do not pay for medical costs if you are eligible for Original Medicare and do not enrol. If you have Medicaid, it is always the secondary insurance if you have Medicare.
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Frequently asked questions
Primary insurance is the insurance that pays first. Medicare is primary when your employer has less than 20 employees.
If you have job-based insurance from a company with fewer than 20 employees, Medicare Part B will be your primary insurance. You should enrol in Medicare Part B before your group plan will pay its portion of the claim.
If you have job-based insurance from an employer with 20 or more employees, Medicare acts as your secondary payer.
If you have multiple forms of 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".

























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