11.4 Claims, Coordination of Benefits, and Subrogation

The claims process and the principle of indemnity

Health insurance is built on the principle of indemnity: the insured should be restored to their pre-loss financial position but not profit from a loss. Because a person may hold more than one health plan - for example coverage through their own employer and a spouse's plan - insurers use Coordination of Benefits (COB), subrogation, and the disability elimination period to enforce indemnity and prevent over-insurance.

These clauses are the engine behind several reliably tested numeric problems. Unlike most life insurance, which is valued (pays a fixed face amount regardless of actual loss), medical expense insurance is a reimbursement contract: it pays the actual covered expense up to plan limits. That reimbursement nature is exactly why COB, subrogation, and the average-earnings clause exist - each is a mechanism to ensure the insured is made whole but not enriched. Disability income occupies a middle ground, paying a stated monthly benefit but capping it at the insured's actual lost earnings through the relation-of-earnings provision.

Coordination of Benefits (COB)

When two group plans cover the same person, COB designates one as primary (pays first, up to its normal benefits) and the other as secondary (pays remaining eligible expenses up to its limit), so total payments never exceed 100% of the allowable charge. Standard NAIC order-of-benefits rules:

• The plan covering the person as an employee/insured is primary over the plan covering them as a dependent.
• For a child covered by both parents, the birthday rule applies: the plan of the parent whose birthday (month and day, not year) falls earlier in the calendar year is primary.
• For children of divorced parents, a court decree controls; otherwise the custodial parent's plan is primary.

Worked COB example

Maria incurs $4,000 in covered medical bills. She is the employee under Plan A (which would pay 80%, i.e., $3,200) and a dependent under her spouse's Plan B (which would pay 70%).

1. Plan A is primary because it covers Maria as the employee. It pays $3,200.
2. Plan B is secondary. The remaining unpaid balance is $4,000 - $3,200 = $800.
3. Plan B pays the lesser of its normal benefit or the unpaid balance. Its normal benefit would be $2,800 (70%), but COB caps payment at the $800 still owed.
4. Total paid = $4,000, exactly 100% of allowable charges - no profit, satisfying indemnity.

The trap: candidates often add 80% + 70% = 150% and overpay. COB never lets combined payment exceed the total covered charge.

Subrogation and the disability elimination period

Subrogation lets an insurer that has paid a claim step into the insured's shoes to recover from a negligent third party. If a driver injures the insured and the health plan pays $10,000 in bills, the plan may pursue the at-fault driver (or their liability insurer) for that $10,000. Subrogation prevents the insured from collecting twice for one loss.

The elimination period in disability income is a time deductible - the number of days of disability the insured must wait before benefits begin. Longer elimination periods lower the premium.

Worked example: A policy pays $3,000/month with a 90-day elimination period and benefits payable in arrears. The insured is disabled January 1. Benefits do not begin until day 91 (about April 1), and the first check arrives at the end of that benefit month. A disability lasting only 60 days yields zero benefits because it never satisfies the elimination period.

Note how the elimination period differs from a probationary period: the probationary period sits at the front of the policy and applies only to sickness occurring soon after issue, while the elimination period applies to every claim and acts as a recurring time deductible. Subrogation and COB, by contrast, operate after a covered loss is paid - subrogation pursuing a negligent third party, COB allocating between two responsible plans. Together they form the back end of the claims process and reliably generate exam questions that combine a dollar figure with a date or a third-party fact pattern.

Proof of Loss, Assignment, and the Average-Earnings Clause

Tie the claims back end to the front-end paperwork and to disability over-insurance controls. A clean health claim runs: the insured files Notice of Claim, the insurer supplies Claim Forms, the insured submits Proof of Loss, and the insurer pays under Time of Payment of Claims. Benefits are paid to the insured unless the insured executes an assignment of benefits, directing payment straight to the provider — common in medical expense but irrelevant to fixed life proceeds.

The relation-of-earnings (average earnings) clause

Disability income carries its own indemnity guard. The relation of earnings to insurance (average earnings) clause caps total disability benefits from all policies at the insured's actual lost earnings; if combined benefits exceed earnings, each insurer reduces its payment proportionally and refunds the excess premium. This prevents an insured from profiting — and malingering — by stacking multiple disability policies.

Worked over-insurance example

An insured earning $5,000/month holds two disability policies that would together pay $6,000/month. Under the average-earnings clause, total benefits are reduced to the $5,000 actually lost, allocated proportionally between the insurers, with excess premium refunded. Contrast COB (which allocates medical expense between plans) and subrogation (which recovers from a third party): the average-earnings clause polices disability income against the insured's own wages. All three exist for the same reason — to enforce indemnity so the insured is made whole but never enriched by a covered loss.