Common Fund Doctrine Medical Liens
Last updated: August 27, 2026
What Is the Common Fund Doctrine?
The common fund doctrine is an equitable principle that allows attorney fees and litigation costs to be deducted from a recovery before liens are paid. The doctrine is based on the idea that medical lienholders benefit from the attorney's work in creating the recovery fund and should share in the cost of creating it. Without this doctrine, the injured person would bear the entire cost of attorney fees while lienholders recover their full claims.
| Type of Lien | Common Fund Doctrine Applies? | Notes |
|---|---|---|
| ERISA Plan (silent on common fund) | Yes – per McCutchen | Plan shares proportionally in attorney fees and costs |
| ERISA Plan (rejects common fund) | No | Plan recovers full claim without sharing fees |
| Medicare Conditional Payments | Not directly, but may reduce for procurement costs | Medicare uses its own formula for procurement cost reductions |
| Medicaid Lien | Varies by state | Some states apply procurement cost formula; others do not |
| Hospital Statutory Lien | Varies by state statute | Some states require proportional sharing; others give lien priority |
U.S. Airways v. McCutchen
In U.S. Airways, Inc. v. McCutchen (2013), the Supreme Court held that the common fund doctrine applies to ERISA subrogation unless the plan document clearly rejects it. The plan in that case sought full reimbursement of its medical payments without sharing in attorney fees. The Court held that because the plan document did not explicitly reject equitable defenses, the participant could invoke the common fund doctrine to reduce the plan's recovery proportionally.
Calculating the Reduction
The common fund reduction is typically calculated as a proportional share of attorney fees and litigation costs. The percentage of attorney fees and costs is applied proportionally to the ERISA plan's claim. If fees and costs represent a certain percentage of the gross recovery, the plan's claim is reduced by that same percentage. The plan then recovers the reduced amount rather than its full claim.
State Law Variations
State law governs the application of the common fund doctrine to hospital statutory liens and other state-law-based liens. Some states have statutes that require proportional sharing of attorney fees for hospital liens. Other states give hospital liens absolute priority over attorney fees. For fully insured health plans subject to state law, the common fund doctrine applies only if state law recognizes it.
Rejecting the Common Fund Doctrine
ERISA plan documents that explicitly reject the common fund doctrine may allow plans to recover their full claims without sharing attorney fees. Courts enforce plan language that clearly rejects equitable defenses.
Does the common fund doctrine apply to all medical liens?
No. The common fund doctrine is an equitable principle that may be rejected by contract or statute. ERISA plans can reject it in their plan documents. Medicare and Medicaid may reduce claims for procurement costs but are not bound by the common fund doctrine. Hospital lien statutes vary by state; some recognize the doctrine, others do not.
How is the common fund reduction calculated?
The common fund reduction is typically calculated as a proportional share of attorney fees and litigation costs. For example, if attorney fees and costs are 40% of the gross recovery, the lienholder's claim is reduced by 40%. Some jurisdictions apply different formulas or allow judges to determine a reasonable allocation.