
Medical primary insurance is the plan that kicks in first when an individual makes a claim, paying the claim as if it were the only source of health coverage. This is followed by the secondary insurance plan, which covers the remaining costs. In the US, Medicare is considered the primary insurance for those aged 65 and above, while their employer has less than 20 employees. Coordination of benefits is the process that decides which insurance company is the primary payer. Individuals do not get to choose which plan is the primary one.
| Characteristics | Values |
|---|---|
| Definition | Primary insurance is the insurance that pays first. |
| Number of Plans | Most people have a primary insurance plan, but not everyone has or needs a secondary insurance plan. |
| Combination of Plans | Primary commercial plan, secondary commercial plan; primary commercial plan, secondary Medicare; primary commercial plan, secondary medical assistance; primary Medicare, secondary commercial plan. |
| Who Pays First | The primary payer pays up to the limits of its coverage, then sends the rest of the balance to the secondary payer. |
| Who Pays Second | The secondary payer pays only if there are costs the primary insurance didn't cover. |
| Coordination of Benefits | The primary and secondary insurance companies make sure they aren't paying more than 100% of the overall bill through a process known as "coordination of benefits". |
| Cost-Sharing | The insured might still be responsible for some cost-sharing, such as deductibles, copay, and coinsurance fees. |
| Billing | The primary insurance is always billed first, and the insured cannot choose which insurance is used when scheduling or receiving healthcare services. |
| Exhaustion of Primary Insurance | When the primary insurance is exhausted, the secondary insurance takes effect and may cover the remaining costs. |
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What You'll Learn

Primary insurance is the first payer
The coordination of benefits (COB) is a framework that ensures both primary and secondary insurers work together, each paying their fair share without overlapping or paying more than 100% of the medical costs. This coordination determines which insurance company is the primary payer. For example, if an individual has an employer-based plan and is also enrolled in Medicare, the employer-based plan is typically considered the primary insurer, and will be responsible for paying its portion of the claim first.
There are various situations in which an individual may have two health insurance plans. For instance, a married couple may have separate health plans, but also be covered under their spouse's plan. In this case, the birthday rule applies, where the parent with the earlier birthday in a year is considered the primary health plan. Another example is an individual under 26 who has a health plan through an employer but is also covered by their parents' plan. In the context of travel insurance, some plans require travellers to have primary health insurance, and in most cases, any health insurance company is considered a primary healthcare provider, except for Medicaid.
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Secondary insurance covers remaining costs
When an individual has two health insurance plans, the primary payer handles the first portion of the claim and then sends the rest to the secondary payer. The primary insurance pays first up to its coverage limits, after which the secondary insurance pays any remaining costs. This process is called the coordination of benefits (COB) and ensures that both health plans pay their fair share without paying more than 100% of the medical costs.
Secondary insurance covers the remaining costs, such as deductibles, copays, or coinsurance. It is important to note that the secondary insurance company may not pay the rest of the bills, and the individual may still be responsible for some healthcare costs. The secondary insurance may also not cover the deductible attached to the primary insurance, which the individual may have to pay themselves.
An example of when secondary insurance covers remaining costs is when an individual has employer-sponsored group health insurance as their primary coverage and becomes eligible for Medicare. In this case, Medicare acts as the secondary insurance and may help cover eligible costs, such as deductibles and co-payments, that the primary insurance does not cover.
Another example is when a child is covered under both parents' insurance plans. In this case, the "birthday rule" applies, and the parent whose birthday comes first in the year has the primary plan, while the other parent's plan is secondary.
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Coordination of benefits (COB)
The COB process ensures that each company pays its own part of the claim without overlap. This means that the combined benefits of the two plans do not surpass the total cost of the treatment. In other words, the primary and secondary insurance companies make sure they aren’t paying more than 100% of the overall bill.
The COB process is particularly relevant for individuals with Medicare who also have other insurance coverage. In such cases, Medicare may be the secondary payer, paying only if there are costs that the primary insurance did not cover.
Determining which insurance plan is the primary payer and which is the secondary payer depends on several factors, including the insurance company, the specific insurance plans involved, and the state of residence. For example, in the case of a married couple, the parent with the earlier birthday in a year is usually considered the primary payer, while the other spouse is the secondary payer. Other factors that can determine the primary payer include age, the size of the company providing the insurance coverage, and whether the individual is enrolled as an employee or the main policyholder.
Completing the COB process is important to ensure a smooth billing process and to prevent insurance companies from refusing to pay any claims.
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Medicare as primary insurance
When you have Medicare alongside another form of insurance, Medicare can be either your primary or secondary insurer. The primary payer pays up to the limits of its coverage, then sends the rest of the balance to the secondary payer. The secondary payer then reviews the remaining bill and pays its portion. In some cases, you may be responsible for any remaining costs not covered by the primary and secondary payers.
There are rules in place to determine which of your insurance companies is the primary payer. For example, if you are 65 or older and your employer has fewer than 20 employees, Medicare is considered primary. If your employer has 20 or more employees, a private insurer is considered primary. If you are an active military member with military coverage and your own health insurance, your military coverage is considered primary.
It is important to inform your doctor and other healthcare providers if you have coverage in addition to Medicare. This will help them send your bills to the correct payer and avoid delays. You may also be asked about other coverage at the time of enrollment. Your insurers must report to Medicare when they are the primary payer on your medical claims.
If you have questions about who pays your Medicare bills first, you can contact your insurance provider or Medicare's Benefits Coordination & Recovery Center (BCRC).
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Travel insurance and primary coverage
When it comes to travel insurance and primary coverage, it's important to understand the difference between primary and secondary coverage and how it applies to medical expenses. This knowledge will help you navigate the complexities of insurance plans and choose the right coverage for your travel needs.
Primary coverage is the insurance that pays out first when you incur a covered medical expense while travelling. It allows you to file a claim directly with your travel insurance provider, without having to go through your primary health insurance first. This results in a faster and simpler claims process, as you only have to deal with one insurer. Primary coverage offers a broader range of protection and can provide benefits that regular health insurance plans may not, such as baggage protection, trip cancellation coverage, and travel delay coverage. It is also ideal for adventure travellers or those at higher risk of injury, as it ensures direct reimbursement without the need to navigate multiple claims.
On the other hand, secondary coverage requires you to file a claim with your primary health insurer before filing with your travel insurance provider. If your primary insurer does not cover all of the claim, your travel insurer can then cover the remaining eligible expenses up to the policy limit. Secondary coverage plans are generally more affordable than primary coverage plans. If you have strong health insurance coverage that extends to your travel destination, secondary travel insurance can be a cost-effective supplement.
It's important to note that the choice between primary and secondary coverage depends on various factors, including your current health insurance, travel destinations, and risk tolerance. For example, if you are a senior on Medicare, which does not cover international medical expenses, primary travel medical insurance is essential. However, if you are travelling domestically and your primary health insurance provides comprehensive coverage, secondary travel insurance may be sufficient.
Additionally, when considering deductibles and coinsurance, it's crucial to understand that these factors will determine the amount you'll pay out of pocket. Deductibles are the amount you must pay before your travel insurance coverage kicks in, while coinsurance is the portion of the bill you must pay after meeting your deductible. By understanding these aspects, you can make a more informed decision about your travel insurance and choose the coverage that best suits your needs.
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Frequently asked questions
Primary insurance is the insurance that pays first. It is the insurance company that is responsible for paying the claim first, up to the limits of its coverage.
A primary commercial plan is an example of a primary insurance plan.
Primary insurance is billed first and always pays first. Secondary insurance takes effect when the primary insurance is exhausted and covers the remaining costs.
Yes, it is possible to have two health insurance plans. For example, a married couple might have two health insurance plans, or an individual might have health insurance through an employer and also receive Medicaid or Medicare coverage.
The primary and secondary insurance status depends on the situation and the type of insurance plans. For example, if you have Medicare and other health insurance, Medicare is usually the secondary payer.












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