Subrogation

Subrogation is the substitution of one party for another with respect to a legal claim: where A pays a loss that B suffered and C caused, A takes over B's claim against C to the extent of that payment. In insurance it is the mechanism by which an insurer, having paid its policyholder, pursues the party at fault. The National Association of Insurance Commissioners describes it as the "situation where an insurer, on behalf of the insured, has a legal right to bring a liability suit against a third party who caused losses to the insured", adding that the "insurer maintains the right to seek reimbursement for losses incurred by insurer at the fault of a third party." The association lists a separate headword for the subrogation clause, which is the section of a policy that states the right.

The clearest statement of how the transfer works is in the federal government's Standard Flood Insurance Policy at 44 CFR Part 61 Appendix A: "Whenever we make a payment for a loss under this policy, we are subrogated to your right to recover for that loss from any other person. That means that your right to recover for a loss that was partly or totally caused by someone else is automatically transferred to us, to the extent that we have paid you for the loss." Two things in that sentence do the work. The transfer is automatic on payment rather than on request, and it is bounded by the amount paid.

The doctrine exists for two reasons, and both explain features that otherwise look arbitrary. The first is that a person should not be paid twice for one loss. Without subrogation, someone whose car was destroyed by a negligent driver could collect from their own insurer and then collect the same loss again from the driver. The second is that the cost should end up with the party who caused it rather than being absorbed by everyone who pays premiums into the same pool. Those two purposes are why the right is capped at what the insurer actually paid, and why it exists at all in the absence of any agreement with the wrongdoer.

The policyholder carries a duty not to damage the right, and it is the part most often broken accidentally. The federal flood policy states it directly: "After the loss, you may not give up our right to recover this money or do anything that would prevent us from recovering it." Private policies carry equivalent language. What that rules out is signing a release, accepting a settlement, or agreeing to "handle it between ourselves" with the responsible party after a loss the insurer has paid or may pay. A neighbor whose contractor flooded a kitchen, offered a few thousand dollars and a signature, has just extinguished the claim the insurer would have pursued, and can find the coverage compromised as a result. Before a loss the picture is different: contracts, particularly commercial leases and construction agreements, frequently contain a waiver of subrogation in which each side agrees in advance that its insurer will not pursue the other. That is a term the insurer prices, which is precisely why it has to be agreed in advance rather than improvised afterwards.

Who gets paid first out of a partial recovery is a real and consequential split, and the contract does not always win. The federal flood policy takes the strongest contractual position available: "If you make any claim against any person who caused your loss and recover any money, you must pay us back first before you may keep any of that money." Read literally, a policyholder who recovers less than the full loss hands all of it to the insurer and keeps none of their own uninsured shortfall.

State law can displace that. Ohio, for example, provides by statute that "notwithstanding any contract or statutory provision to the contrary", the rights of a subrogee asserting a contractual, statutory or common law subrogation claim in a personal injury action are subject to a proportionate reduction: where less than the full value of the claim is recovered, whether because of comparative negligence or "by reason of the collectability of the full value of the claim for injury, death, or loss to person resulting from limited liability insurance or any other cause", the subrogee's claim "shall be diminished in the same proportion as the injured party's interest is diminished." The statute reaches insurers, self-funded health plans, health care provider-sponsored organizations, and any person or entity claiming subrogation by contract or common law, and it gives either side a route to court if the distribution is disputed. Other states approach the same problem through a made-whole rule, under which the insured is compensated in full before the subrogee takes anything, and some leave the contract to govern. Whether a state rule of that kind reaches a particular plan is a further legal question that turns on how the plan is funded. The practical point is that "the policy says they get paid first" is the beginning of the analysis rather than the end of it.

Insurance is the largest application of the doctrine, not the only one. Federal law makes the United States a subrogee for Medicare: 42 U.S.C. section 1395y(b)(2)(B)(iv) provides that "the United States shall be subrogated (to the extent of payment made under this subchapter for such an item or service) to any right under this subsection of an individual or any other entity to payment with respect to such item or service under a primary plan", and the adjacent provision allows the United States to collect double damages from an entity that should have paid. Employer health plans and workers' compensation carriers assert the same kind of claim against an injury settlement, which is why a personal injury recovery is often smaller in the claimant's hands than the headline number. A mortgagee has its own version: the federal flood policy provides that where the insurer pays the mortgagee and denies payment to the borrower, "we are subrogated to all the rights of the mortgagee granted under the mortgage on the property." And it runs outside insurance entirely. Under the Uniform Commercial Code, a bank that pays a check over a valid stop-payment order is subrogated to the rights of the parties to the underlying transaction, so that a customer who genuinely owed the money does not get it back from the bank; the stop payment page carries that mechanism in full.

On the auto version, one detail is worth flagging and belongs elsewhere. When a collision insurer pays its own policyholder and then recovers from the at-fault driver, what happens to the policyholder's deductible depends on how much is recovered and on the policy's own language. That is covered on the collision coverage page, which owns it.

A covered loss happens and someone else caused it. The insurer pays its policyholder under the policy, and on payment the policyholder's claim against the responsible party transfers to the insurer up to the amount paid. The insurer may ask the policyholder to acknowledge the transfer in writing and to cooperate, and it pursues the responsible party or their liability insurer. If it recovers, the money is applied to what it paid out, and how any shortfall between the recovery and the policyholder's total loss is shared depends on the policy language and on the applicable state's law.

A hypothetical, to show why the priority rule decides real money. Rhea is injured by another driver. Her health plan pays $18,000 of her medical bills. The full value of her claim, counting the medical costs and everything else she is entitled to recover, comes to $25,000, so the part of her loss that nobody has paid is $25,000 − $18,000 = $7,000. The at-fault driver carries only $15,000 of liability coverage, and that is all that can be collected. Her recovery is therefore 60 percent of the full value ($15,000 divided by $25,000).

Under a plan document providing that the plan is repaid first out of any recovery, the plan takes the whole $15,000 and Rhea keeps $0 of her $7,000 shortfall.

Under Ohio's proportionate-reduction statute, the subrogee's claim is diminished in the same proportion as the injured party's interest. The plan's $18,000 claim becomes $18,000 × 0.60 = $10,800, and Rhea keeps $15,000 − $10,800 = $4,200, which is exactly 60 percent of her $7,000 shortfall. Both parties take the same haircut.

The figures are invented and the outcome in any real case depends on the plan and the state. What the arithmetic shows is that the difference between the two rules is not technical: on these numbers it is the difference between $4,200 and nothing.

What the doctrine gets right

• It prevents a double recovery for one loss, which keeps the payout tied to the actual harm.
• It shifts cost to the party who caused the loss rather than to the premium pool, which is the mechanism by which liability actually attaches to conduct.
• The recovery can return money to the policyholder too, most visibly a deductible on a not-at-fault auto claim.
• It works automatically on payment, so the policyholder does not have to pursue anyone in order to be paid.

What it costs the policyholder

• A settlement or release given to the responsible party after a loss can destroy the insurer's right and compromise the coverage, and few people realize that when the offer is made.
• Out of a partial recovery, a "pay us back first" clause can leave the policyholder with nothing toward their own uninsured shortfall.
• The rules differ by state and by the kind of plan asserting the claim, so the same facts produce different distributions in different places.
• Health plan and Medicare claims against an injury settlement routinely reduce what the injured person keeps, often by more than they expected.
• A waiver of subrogation agreed in a lease or construction contract binds the insurer, so signing one without telling the insurer creates a problem of its own.
• The pursuit takes time, and the policyholder can be asked to cooperate with litigation long after they considered the claim finished.