
Coordination of benefits rules can be complex, but understanding the basics can save you time and money in the long run. The general rule is that the primary insurance plan pays its full share of the claim, and the secondary insurance plan pays its full share of the remaining balance.
You'll often see coordination of benefits rules applied when you have multiple health insurance plans, such as through work and your spouse's employer. The order of payment is usually determined by the plan with the most comprehensive coverage.
What Is Coordination of Benefits?
Coordination of benefits is a process insurance companies use to determine how to cover your medical expenses when you're covered by more than one health insurance plan. This process clarifies who pays what by determining which plan is the primary payer and which is secondary.
It ensures proper claim processing and helps avoid overpayment or duplicate payments.
How It Works
Coordination of benefits rules health insurance can be a bit complex, but let's break it down. The primary plan is responsible for processing the claim first and paying its share of the coverage amount.
Your out-of-pocket cost for services is limited to the amount, if any, that remains unpaid by the insurers. This is because the combined benefits from all plans shouldn't surpass the total cost of the treatment.
The order in which insurance plans pay for covered services is determined by COB rules. The plan that pays first is your primary plan, which must provide you with the maximum benefits available to you under the plan.
In cases where a person has coverage as a dependent, their own coverage is typically primary. The "birthday rule" is often used to determine which insurance is primary: the primary insurance is the one held by the person whose birthday falls earlier in the year.
To prevent overpayment or duplication, plans will not pay more than 100% of the cost of the medical service(s). This means that the combined benefits from all plans should equal the total cost of the treatment.
Here's a quick rundown of how COB works:
COB applies to various types of insurance, including employer-sponsored plans, individual health insurance, Medicare, Medicaid, and more. This ensures that benefits are optimized across all relevant plans.
Entities Involved
COB applies to various types of insurance, including employer-sponsored plans, individual health insurance, Medicare, Medicaid, and more. The coordination process ensures that benefits are optimized across all relevant plans.
Medicaid and Medicare are two government programs that often interact with private health insurance. Determining primary or secondary responsibility for these programs depends on factors such as age, company size, and other considerations.
To determine the order of coverage for Medicaid and Medicare, check your insurance policy and coverage details or consult with your employer.
Entities

Medicare is the secondary payor if you have an employer-sponsored group health plan that employs 20 or more people.
If you're eligible for Medicare and also have an employer-sponsored group health plan, your employer's group health plan is the primary payor.
Medicaid and Medicare are government programs that can be involved in determining primary or secondary responsibility for health coverage.
The size of the company you have employer coverage with and your age can be factors in determining the order of coverage for Medicaid and Medicare.
Employer-sponsored plans, individual health insurance, Medicare, Medicaid, and other types of insurance can have coordination of benefits (COB) applied to them.
The university's self-insured non-ERISA plans, including those administered by BCBSM, BCN, and PHP/UM Health Plan, will assume primary liability to provide benefits available under your university plan.
BCBSM, BCN, and PHP/UM Health Plan will pay as primary before any no-fault automobile policy, regardless of whether you have purchased a coordinated or uncoordinated policy.
Medicare will pay as the third carrier for any unpaid charges, if any, in accordance with their terms and conditions for covered services after the university plan and no-fault plan have made payment.
Employees

When dealing with employees and their health insurance plans, it's essential to understand the rules that govern which plan takes precedence.
An employee's plan is primary if they are covered by a group contract and also by a spouse's plan.
If an employee is covered by two group contracts, the plan with the earliest effective date is considered the primary plan.
This means that if you have multiple health insurance plans, the one that started first takes priority.
Dependents
If you have dependents covered by more than one health plan, insurers use the birthday or gender rule to determine which plan is primary.
The birthday rule states that if the health plans of both parents use the birthday rule, the plan of the parent whose birthday falls earlier in the year (month and day) is primary for the dependent children.
If the month and day are the same, the policy that was in effect first is primary.

The gender rule states that if the health plans of both parents use the gender rule, the father's plan is always primary for dependent children.
If the health plan of one parent uses the birthday rule and the other uses the gender rule, the gender rule prevails, and the father's plan is primary.
Exceptions occur when a divorce decree determines which health plan is primary.
Here's a summary of the birthday rule for determining primary coverage for dependent children:
Rules and Guidelines
COB rules can be complex, but understanding the basics can help you navigate the process. COB rules help organize and manage healthcare benefits and costs.
To determine which plan is primary, consider the following general rules. The plan that covers the patient as the faculty or staff member (member or subscriber) is primary and pays before a plan that covers the patient as a dependent.
If a child is covered under both parents' plans, the plan of the parent (or legal guardian) whose birthday is earlier in the year is the primary plan. This rule applies unless a court order places financial responsibility on one parent, in which case benefits are determined differently.
The order of benefits for children of divorced or separated parents is typically as follows: If the primary plan cannot be determined by using the guidelines above, then the plan covering the child the longest is primary.
What Is The Purpose Of
COB ensures that multiple insurance plans work together to avoid overpayment and ensure accurate coverage for a policyholder's medical expenses.
Having multiple insurance plans can be confusing, but COB helps clarify things by ensuring that each plan only covers what it's supposed to.
A good example of COB in action is when a policyholder has both employer-sponsored and individual insurance plans, and COB ensures that the two plans work together seamlessly.
This helps prevent overpayment and ensures that the policyholder's medical expenses are covered accurately.
Rules
Rules are in place to help manage healthcare benefits and costs, but they can vary depending on several factors, including the insurance company and the specific insurance plans involved.
Coordination of Benefits (COB) rules help organize and manage healthcare benefits and costs, but they can be complex. The plan for which you are enrolled as an employee or main policyholder is usually the primary payer.
If you have continuation coverage, such as COBRA, and coverage from another plan, the benefits of the plan covering you as a member or employee are primary. Your continuation coverage would be secondary.

If a group health plan does not have a Coordination of Benefits provision, that plan is primary. Here are some general guidelines to determine primary and secondary plans:
- If a child is covered under both parents' plans, the plan of the parent (or legal guardian) whose birthday is earlier in the year is the primary plan.
- If the primary plan cannot be determined by using the guidelines above, then the plan covering the child the longest is primary.
In cases where dependents are covered by more than one health plan, insurers use the birthday or gender rule to determine which plan is primary. If the health plans of both parents use the birthday rule, the plan of the parent whose birthday falls earlier in the year is primary for the dependent children.
The plan that covers the patient as the faculty or staff member (member or subscriber) is primary and pays before a plan that covers the patient as a dependent.
Subrogation
Subrogation is a process where another party is responsible for paying for services your health plan has already covered. This can happen in certain cases.
Another person, insurance company, or organization may be legally obligated to pay for services your health plan has covered. Your health plan will take over your right to recover payment from them.
You'll be required to help your health plan enforce its right of recovery. This means doing whatever is necessary to assist them in getting paid.
If you receive money through a lawsuit, settlement, or other means for services paid under your coverage, you'll need to reimburse your health plan. However, this doesn't apply if the funds you receive are from additional coverage you purchased in your own name from another health care company.
Challenges and Solutions
Navigating coordination of benefits can present several challenges that might seem overwhelming at first. Delayed claims processing is one such challenge that can occur.
Claims can be delayed due to discrepancies in benefit payments, which can be frustrating for those waiting for reimbursement. Resolving COB disputes is also a common issue that requires careful attention.
To overcome these challenges, it's essential to be aware of the potential problems and implement solutions accordingly. Complex coordination guidelines can make it difficult to understand what benefits are covered and when.
Here are some common challenges and their corresponding solutions:
- Delayed Claims Processing: Implement efficient claims processing systems.
- Discrepancies in Benefit Payments: Regularly review and reconcile benefit payments.
- Resolving COB Disputes: Establish clear communication channels and dispute resolution processes.
- Complex Coordination Guidelines: Simplify guidelines and provide clear explanations.
- Overlapping Deductibles and Out-of-Pocket Costs: Clearly outline coverage and out-of-pocket expenses.
- Limited Provider Networks: Expand provider networks or offer alternative solutions.
- Communication and Record-Keeping: Maintain accurate records and communicate effectively with all parties involved.
Challenges and Solutions
Navigating coordination of benefits can be a complex process, but being aware of the potential challenges can help you prepare for them. One common issue is delayed claims processing, which can lead to frustration and financial burdens.
Discrepancies in benefit payments can also cause problems, as they may result in incorrect or incomplete payments. This can be particularly challenging for individuals who rely on these benefits for their healthcare needs.
Resolving COB disputes is crucial to avoid further complications. If claims are overpaid due to COB, the excess amount may need to be reimbursed to the insurance company that made the overpayment.
To overcome these challenges, it's essential to understand the complex coordination guidelines that govern COB. These guidelines can be lengthy and confusing, but taking the time to review them can help you avoid common pitfalls.
Overlapping deductibles and out-of-pocket costs can also create difficulties, making it hard to predict and manage healthcare expenses. Limited provider networks can further complicate matters, leaving individuals with limited options for care.

Here are some common challenges and potential solutions:
- Delayed Claims Processing: Implement a system for tracking and following up on claims to ensure timely processing.
- Discrepancies in Benefit Payments: Regularly review and reconcile benefit payments to identify and correct errors.
- Resolving COB Disputes: Establish a clear process for resolving disputes and communicating with insurance companies.
- Complex Coordination Guidelines: Develop a comprehensive guide to COB guidelines and procedures.
- Overlapping Deductibles and Out-of-Pocket Costs: Use budgeting tools and financial planning resources to manage healthcare expenses.
- Limited Provider Networks: Research and identify alternative providers or networks to ensure access to necessary care.
- Communication and Record-Keeping: Maintain accurate and up-to-date records and communicate regularly with insurance companies and healthcare providers.
Drawbacks of Using Cob
Managing multiple health insurance plans can be a hassle, and it's essential to consider the administrative complexity involved. You'll need to deal with additional paperwork, coordination with multiple providers, and understanding the details of each plan's rules and coverage.
Maintaining more than one plan may not be cost-effective if the combined premiums, deductible copayments, and coinsurance outweigh the benefits received. This is a crucial consideration to make before enrolling in multiple health plans.
COB can impact out-of-pocket costs by coordinating coverage between multiple insurance plans, potentially reducing the amount you need to pay. This can be a significant advantage, but it's essential to weigh the benefits against the potential drawbacks.
Right to Recovery
Health care and insurance plans have a right to recoup any excess amount paid over what's called for by their plan. This excess amount can be recovered from the person for whom the payments were made.

Insurance companies and organizations can also be held responsible for overpaid amounts. They may need to reimburse the insurance company that made the overpayment.
Claims can be overpaid due to coordination of benefits (COB), which can lead to a need for reimbursement. The excess amount may need to be reimbursed to the insurance company that made the overpayment.
Health care and insurance plans generally have the right to recoup excess amounts, which can be recovered from various parties involved in the payment process.
Claims and Payments
Always submit claims to your primary plan first, as this is the first step in the coordination of benefits process.
You should keep copies of all forms and receipts for your own files, as these may be needed to support your claim.
The amount payable under your secondary plan will take into account any coverage you have under your primary plan.
Benefits will be coordinated to provide maximum reimbursement for expenses covered under either plan without providing for duplicate payments.
Here are some key things to keep in mind when submitting claims to your health plan:
- Always submit claims to your primary plan first.
- Keep copies of all forms and receipts for your own files.
Frequently Asked Questions
How to determine which insurance is primary and secondary?
Primary insurance is typically your own plan, while secondary insurance is any additional coverage from a spouse, parent, TRICARE, or Medicaid. Check your plans to see which one is primary and which one is secondary
Sources
- https://www.cms.gov/medicare/coordination-benefits-recovery/overview/coordination-benefits
- https://www.ehealthinsurance.com/resources/individual-and-family/coordination-of-benefits
- https://www.metlife.com/stories/benefits/coordination-of-benefits/
- https://hr.umich.edu/benefits-wellness/health-well-being/health-plans/rates-paying-health-coverage/coordination-benefits
- https://www.blueadvantagearkansas.com/members/understanding-your-insurance/health-insurance-basics/frequently-asked-questions/coordination-of-benefits
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