
Medicare is a federal government health insurance program that provides coverage for people over 65, under 65 and receiving Social Security Disability Insurance (SSDI), or those with End-Stage Renal Disease (ESRD), regardless of age. When an individual has Medicare and another type of insurance, Medicare can act as either the primary or secondary insurer, depending on the situation. This is known as coordination of benefits and aims to ensure that the individual receives the correct level of coverage without overpaying or facing gaps in their coverage. Medicare's role as a secondary payer means that it provides coverage for healthcare costs only after other insurance sources have paid their share.
| Characteristics | Values |
|---|---|
| What is a primary payer? | The insurance plan responsible for footing the initial bill for your medical services. |
| What is a secondary payer? | The payer that enters the scene after the primary payer has done its part. |
| Who decides which payer pays first? | Rules called the coordination of benefits decide which payer pays first. |
| What is the role of the primary payer? | The primary payer pays what it owes on the bills first and sends the remaining amount to the secondary payer. |
| What is the role of the secondary payer? | The secondary payer pays if there are any costs the first payer didn't cover. |
| When is Medicare the primary payer? | When the beneficiary is not covered by other types of health insurance or coverage. |
| When is Medicare the secondary payer? | When Medicare provides coverage for healthcare costs only after other insurance or sources have paid their share. |
| What is conditional payment? | Medicare may make a conditional payment to pay the bill if the insurance company doesn't pay the claim promptly. |
| What is Coordination of Benefits? | Coordination of Benefits is a system designed to ensure that you receive the maximum benefits from all your insurance plans without overpaying or facing gaps in coverage. |
| What is MSP? | Medicare Secondary Payer. |
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What You'll Learn

Medicare as a secondary payer
Medicare is a federal government health insurance program that provides health care coverage for people aged 65 or older, those under 65 who have received Social Security Disability Insurance (SSDI) for 24 months, those who begin receiving SSDI due to ALS/Lou Gehrig's disease, and those with End-Stage Renal Disease (ESRD) of any age.
When an individual has Medicare alongside another type of insurance, Medicare can act as either the primary or secondary insurer. Medicare's role as a secondary payer refers to situations where Medicare provides coverage for healthcare costs only after another insurance or source has paid its share. In such cases, the primary payer pays up to the limits of its coverage, and then the secondary payer may cover the remaining costs. This order of payment is called ""coordination of benefits"" and is designed to ensure that individuals receive the maximum benefits from all their insurance plans without overpaying or facing gaps in coverage.
There are specific rules to determine which entity will be the primary or secondary payer. For example, if an individual is 65 or older and covered by a Group Health Plan (GHP) through their current employment or their spouse's current employment, and the employer has less than 20 employees, Medicare pays primary, and GHP pays secondary. Conversely, if the employer has 20 or more employees, the GHP pays primary, and Medicare pays secondary.
In cases where Medicare is the secondary payer, it is important to provide accurate and up-to-date insurance information to healthcare providers to ensure correct billing to both primary and secondary payers. Additionally, individuals should keep both insurers informed about their multiple sources of coverage.
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Coordination of benefits
When an individual has two types of health insurance, such as Medicare and an employer-sponsored plan, coordination of benefits (COB) rules come into play to determine the order of payment. This system ensures that the individual receives the maximum benefits from all their insurance plans without overpaying or facing gaps in coverage.
In the context of Medicare, the coordination of benefits establishes the sequence in which claims are submitted to the primary and secondary payers. The primary payer, which could be the individual's health insurance provided by their employer, is responsible for paying its share of the expenses first. Once the primary payer has paid up to the limits of its coverage, the remaining balance is then sent to the secondary payer, which could be Medicare. The secondary payer evaluates the claim and covers any remaining eligible costs according to its guidelines.
It is important to note that Medicare may act as either the primary or secondary payer, depending on the situation. For example, if an individual is covered by Medicare and COBRA, Medicare typically pays primary for those with End-Stage Renal Disease (ESRD) or disability, while COBRA pays secondary. However, for individuals aged 65 or older, Medicare pays primary, and COBRA pays secondary. Similarly, if an individual has Medicare and is covered under Workers' Compensation for a job-related illness or injury, Workers' Compensation pays primary, and Medicare pays secondary.
The coordination of benefits process also involves the individual's responsibility to provide accurate and up-to-date insurance information to their healthcare providers. This ensures proper billing to both the primary and secondary payers and helps prevent overpayment or double-dipping, where multiple insurers pay more than the actual cost of medical care.
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Primary and secondary payers
Medicare Secondary Payer (MSP) is the term used when the Medicare program does not have primary payment responsibility. In other words, another entity has the responsibility for paying before Medicare. When Medicare was established in 1966, it was the primary payer for all claims except for those covered by Workers' Compensation, Federal Black Lung benefits, and Veteran’s Administration (VA) benefits. However, in 1980, Congress passed legislation that made Medicare the secondary payer to certain primary plans, shifting costs from Medicare to appropriate private sources.
The MSP provisions apply when Medicare is not the beneficiary's primary health insurance coverage. Medicare remains the primary payer for beneficiaries who are not covered by other types of health insurance. When Medicare and other health insurance are both involved, each type of coverage is called a "payer". The "primary payer" pays up to the limit of its coverage and then sends the remaining balance to the "secondary payer". If the secondary payer doesn't cover the remaining balance, the individual may be responsible for the remaining costs.
There are various situations in which Medicare may be the primary or secondary payer, depending on the individual's circumstances. For example, if an individual is 65 or older and covered by Medicare and COBRA, Medicare pays primary and COBRA pays secondary. If an individual is 65 or older and has an employer retirement plan, Medicare pays primary and retiree coverage pays secondary. If an individual has Medicare and is covered under Workers' Compensation for a job-related illness or injury, Workers' Compensation pays primary, and Medicare pays secondary.
It is important to note that Medicare may make a conditional payment if the primary payer does not pay the claim promptly. In such cases, Medicare will later recover any payments from the primary payer.
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Medicare Advantage plans
When an individual has Medicare and another form of health insurance, such as a group health plan, retiree coverage, or Medicaid, each type of coverage is assigned a "payer" status. The "primary payer" pays up to the limits of its coverage and then sends the remaining balance to the "secondary payer." If the secondary payer does not cover the remaining balance, the individual may be responsible for the remaining costs.
In certain situations, Medicare Advantage Plans can disenroll members. For example, if a member moves outside the plan's service area, loses Medicare or Medicaid eligibility, joins a drug plan, or if the plan's contract with Medicare ends. It is important to note that joining a Medicare Advantage Plan may result in the loss of employer or union coverage, which could also affect the coverage of their spouse and dependents.
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Workers' compensation
Medicare Secondary Payer (MSP) is a term used when Medicare does not have primary payment responsibility, meaning another entity must pay before Medicare. When Medicare was introduced in 1966, it was the primary payer for all claims except those covered by workers' compensation, Federal Black Lung benefits, and Veteran’s Administration (VA) benefits.
In the context of workers' compensation, if an individual is entitled to Medicare and is covered under workers' compensation due to a job-related illness or injury, workers' compensation insurance pays first, followed by Medicare. It is important to note that Medicare generally will not pay for an injury, illness, or disease covered by workers' compensation. However, if the workers' compensation insurance company denies payment for medical bills, Medicare may make a conditional payment pending the insurance company's review of the claim.
In such cases, Medicare may pay a claim related to a medical service or product it covers if the claim is not covered by workers' compensation. Before settling a workers' compensation case, parties should consider Medicare's interest regarding future medical services and whether the settlement includes a Workers' Compensation Medicare Set-aside Arrangement (WCMSA). The WCMSA is a recommended method to protect Medicare's interests, and its amount is determined on a case-by-case basis.
If Medicare pays for claims before knowing they are related to a workers' compensation settlement, Medicare must be repaid from the WCMSA. Individuals enrolled in Original Medicare, Medicare Advantage, or a Medicare drug plan must cooperate with the Benefits Coordination & Recovery Center to verify claims related to workers' compensation settlements and repay Medicare accordingly. Therefore, individuals with Medicare coverage must inform their doctors and healthcare providers about any changes in their health insurance due to employment or other reasons to ensure proper billing.
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Frequently asked questions
The primary payer is the insurance plan responsible for footing the initial bill for your medical services. This could be the health insurance provided by your employer, your spouse’s insurance, or another insurance plan.
The secondary payer enters the scene after the primary payer has paid its share. If you have Medicare in addition to another insurance plan, Medicare often plays the role of the secondary payer.
Medicare coordinates with other insurance sources to ensure that your healthcare expenses are covered as effectively as possible. After your primary insurance pays its share, the remaining costs are then submitted to Medicare as the secondary payer. Medicare evaluates the claim and pays its portion, if any, according to Medicare guidelines.
Medicare may act as a secondary payer in cases where you have multiple sources of insurance coverage, such as employer-sponsored health insurance, worker’s compensation, or liability insurance.











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