What Is Subrogation in a Personal Injury Case?

Subrogation is the right of a party who paid your expenses — your health insurer, workers' compensation carrier, or Medicare — to step into your shoes and recover those payments from the person who caused your injury. When you settle a personal injury case, subrogation claims reduce your net recovery. Understanding which parties have subrogation rights, how much they can recover, and how to negotiate their claims is essential to maximizing your take-home settlement.

What Subrogation Is

Subrogation comes from the Latin subrogare — to substitute. When your health insurer pays $20,000 in medical bills for injuries caused by another person's negligence, the insurer has the right to recover those $20,000 from the at-fault party or from any settlement you receive. The insurer is substituted into your position against the wrongdoer to the extent it paid your expenses.

This right exists because double recovery — collecting from your own insurer and then again from the at-fault party for the same bills — is generally not allowed under California law. Without subrogation, an injured party would receive a windfall by recovering medical expenses twice: once from their own insurer and once from the tortfeasor. Subrogation eliminates the windfall by allowing the payor to recover what it paid.

Who Has Subrogation Rights in California Personal Injury Cases

Private health insurance: If your private health insurer paid medical bills that are also part of your personal injury damages claim, the insurer typically has a subrogation right under the terms of your health insurance policy. ERISA-governed employer health plans (most large employer plans) have particularly strong subrogation rights under federal law that can override California's anti-subrogation protections.

Medicare: Medicare has a federal statutory right of recovery under 42 U.S.C. section 1395y(b) for conditional payments made for injuries that are the responsibility of a third party. Medicare's right is mandatory — you must notify Medicare of a personal injury claim, and settlement proceeds must address Medicare's conditional payment before distribution. Failure to resolve Medicare's lien can result in the government recovering directly from you after settlement.

Medi-Cal (California Medicaid): Medi-Cal has a statutory lien under Welfare and Institutions Code section 14124.71 for medical services provided to Medi-Cal beneficiaries injured by third-party negligence. Medi-Cal's lien is subject to California's anti-subrogation protections.

Workers' compensation: If your injury occurred in the course and scope of employment and you received workers' comp benefits, your employer's workers' comp carrier has a lien against your personal injury recovery under Labor Code section 3856. The lien covers medical costs and disability payments made by the carrier.

Disability and no-fault insurers: Depending on the structure of your coverage, disability income replacement insurers may have subrogation rights. California does not have a no-fault auto insurance system, so no-fault subrogation is not a significant California issue.

California's Anti-Subrogation Protections

California provides stronger anti-subrogation protections than most states. Under the Helfend v. Southern California Rapid Transit District (1970) collateral source rule, evidence that the plaintiff's medical expenses were paid by a third party (health insurer, workers' comp) is generally not admissible to reduce the defendant's liability. The at-fault party remains fully liable for the plaintiff's medical expenses even if those expenses were covered by insurance.

California's "made whole" doctrine provides that an insurer cannot recover under subrogation until the insured has been fully compensated for their injuries — made whole. If a $50,000 policy-limits settlement does not fully compensate a plaintiff with $150,000 in total damages, the insurer's subrogation claim may be reduced or eliminated because the plaintiff was not made whole. The made-whole doctrine can significantly reduce subrogation recovery in cases where the defendant's insurance is insufficient.

Critical limitation: ERISA preemption significantly undercuts California's made-whole doctrine for employer-sponsored health plans. Many federal courts have held that ERISA plan terms override California's equitable subrogation rules, allowing ERISA plans to recover the full amount paid regardless of whether the plaintiff was made whole. If your health insurance is through an employer's ERISA plan, California's anti-subrogation protections may not apply.

Medicare Subrogation: The Most Strictly Enforced Lien

Medicare subrogation is governed by the Medicare Secondary Payer Act (MSP), 42 U.S.C. section 1395y(b), and is enforced more strictly than private subrogation. If Medicare paid any medical expenses related to your injury, you must: notify Medicare of the personal injury claim, obtain a conditional payment letter showing what Medicare claims it paid, and resolve Medicare's conditional payment before distributing settlement proceeds.

Medicare's conditional payment amount is often overstated — it may include payments for pre-existing conditions or unrelated treatment. Disputing Medicare's conditional payment amount with the Medicare Secondary Payer Recovery Contractor (MSPRC) before settlement can significantly reduce the lien. Medicare will negotiate the conditional payment amount in proportion to the plaintiff's total damages and the recovery achieved relative to full damages.

Ignoring Medicare's subrogation rights is not an option. Medicare can sue attorneys who distribute settlement proceeds without resolving Medicare's lien, and can recover directly from the plaintiff even after the settlement funds have been distributed.

Workers' Compensation Liens in Personal Injury Cases

When a workplace injury is also a third-party personal injury case — for example, a delivery driver injured by a negligent motorist — both a workers' comp claim and a personal injury case can proceed simultaneously. The workers' comp carrier pays benefits (medical and disability) and acquires a lien against any third-party personal injury recovery under Labor Code section 3856.

California Labor Code section 3856(b) establishes the priority order: after attorney fees and costs are deducted from the personal injury recovery, the workers' comp carrier recovers its lien from the remainder. The carrier's lien is subject to a credit — called the Witt credit — for the proportional attorney fees and costs incurred in obtaining the recovery that benefits the carrier. This typically results in a reduction of the carrier's net lien of approximately 30–40% to reflect its share of litigation costs.

Negotiating Subrogation Claims

Subrogation liens are frequently negotiable, particularly when total damages substantially exceed the recovery. Effective negotiation arguments include: the made-whole doctrine (if applicable); proportional reduction for attorney fees and costs; disputes about whether specific payments were causally related to the personal injury; and hardship or equity arguments when the plaintiff's total recovery is insufficient to compensate for the injury. Most health insurers and workers' comp carriers will accept some reduction from their stated lien amount in exchange for certainty of recovery rather than continued litigation risk.