Who to call for coordination of benefits?

Coordination of Benefits (COB) is mandatory for group health insurance plans and government programs like Medicare when a person has more than one insurance policy.

How COB Works

• Primary Payer: The main insurance plan pays its share of the medical or dental bill first.
• Secondary Payer: The second plan reviews the remaining balance and pays its share, but total payouts cannot exceed 100% of the total medical costs.
• No Duplicate Payments: The process stops insurance companies from paying twice for the same service.

Is it Mandatory for You?

• Policyholder Requirement: If your insurance company sends you a COB form asking if you have other coverage, filling it out and returning it is mandatory.
• Claim Delays: If you ignore the request or fail to update your insurance about dual coverage, the insurer can freeze or deny your medical claims until you provide the information.
• Exemptions: Individual or private plans that are not group-based are generally not required to coordinate benefits.

An example of COB depends on whether you mean an insurance rule, a business deadline, or a physical object.

1. Coordination of Benefits (Insurance)

In health insurance, COB is the rule used when a person has more than one insurance plan to decide which one pays first.

• Example: A child is covered by both parents' health insurance plans. Under the "birthday rule," the insurance plan of the parent whose birthday falls earlier in the calendar year pays the medical bill first. The second parent's plan then covers any remaining balance. You can read more about how this works through MetLife.

2. Close of Business (Business)

In the workplace, COB refers to the end of the normal working day, usually around 5:00 PM.

• Example: A manager says, "Please send me the sales report by COB Tuesday," meaning they need it before everyone leaves the office or logs off for the day on Tuesday.

3. Corncob (Agriculture)

A physical cob is the central, woody cylindrical core of an ear of corn.

• Example: After you eat the sweet corn kernels off a cooked ear of corn, the bare, hard stick left behind is the corncob.

4. Cob (Building Material)

Cob is also an ancient, natural building material made from a mixture of clay, sand, water, and straw.

• Example: People mix these earth materials together to sculpt thick, strong, fireproof walls for sustainable homes.

The four types of coordination of benefits (COB) are Standard (or Traditional), Maintenance, Non-Duplication, and Do Not Coordinate Benefits.

Coordination of benefits dictates how multiple insurance plans share payment responsibilities so that combined payouts do not exceed total medical or dental costs.

1. Standard (Traditional) COB

• How it works: The primary plan pays its normal benefits first. Then, the secondary plan covers the remaining balance up to 100% of the total allowable expenses.
• Result: The patient rarely pays out-of-pocket for covered services as long as the combined secondary payout covers the remainder.

2. Maintenance COB

• How it works: The secondary plan calculates what it would have paid if it were the primary plan. It then reduces that amount by subtracting what the primary plan already paid.
• Result: The secondary plan only pays whatever positive difference remains, without topping off the remaining balance completely.

3. Non-Duplication COB

• How it works: The secondary plan looks at the primary plan's payment. If the primary plan's payment equals or exceeds what the secondary plan would have normally paid on its own, the secondary plan pays zero.
• Result: The patient receives no extra coverage from the secondary plan if the primary plan already paid a higher percentage or equal amount for that specific service.

4. Do Not Coordinate Benefits

• How it works: The secondary plan refuses to coordinate or factor in what the primary insurance paid. Each plan processes the claim independently based on its own rules.
• Result: This can sometimes lead to a denial of secondary payment or strict separate limits, depending on the specific group contract terms.

You can read more about guidelines and rules for managing claims through the American Dental Association or Centers for Medicare & Medicaid Services.

Coordination of benefits (COB) issues happen when multiple insurance plans fail to align correctly on who pays first, leading to delayed payments, claim rejections, and unexpected patient bills.

Common Issues and Causes

• Outdated or Missing Information: Patients often forget to disclose secondary coverage or fail to update changes with their insurer, causing records to mismatch between payers.
• Wrong Billing Order (CO-22 Denials): Submitting a claim to the secondary insurance first prompts payers to reject it until the primary plan processes the charge.
• Medicare and Employer Confusion: Determining whether Medicare or an employer group health plan is primary depends heavily on company size (such as the 20-employee rule) and retirement status, which frequently gets miscalculated.
• Timely Filing Expirations: Lengthy back-and-forth disputes between insurers can push past the strict deadlines allowed for submitting clean claims.

How to Prevent and Resolve COB Problems

• Verify at Intake: Collect complete dual-coverage details and employer sizes during every patient registration.
• Prompt Patient Updates: Instruct patients to contact their member services immediately to update their active order of liability when policies change.
• Follow Standard Rules: Apply clear COB in Medical Billing Rules like the birthday rule for children or active-versus-retiree guidelines to sequence payers accurately.

Your employer health plan pays first and Medicare pays second if your employer has 20 or more employees.

Coordination of benefits depends on the size of your company and whether the coverage is based on current employment.

Who Pays First? (Primary vs. Secondary Payer)

• Large Employers (20+ Employees): Your active employer group health plan (or your spouse's active plan) pays first. Medicare pays second, covering remaining approved costs. Learn more about Medicare's Coordination of Benefits for details.
• Small Employers (Fewer than 20 Employees): Medicare pays first. Your small group employer plan pays second.
• Retiree Coverage: Medicare always pays first for retiree health plans.
• COBRA Coverage: Medicare generally pays first, and COBRA pays second once Medicare is active.
• Disability: If you have Medicare due to a disability, an employer plan pays first only if the company has 100 or more employees. Otherwise, Medicare pays first.

How Claims are Handled

1. Doctor Visits: Show both insurance cards to your healthcare provider.
2. Primary Submission: The provider bills your primary payer first.
3. Secondary Submission: After the primary plan pays its portion, the claim automatically routes to your secondary payer (or you submit the primary explanation of benefits) to cover remaining eligible costs.