Both a Letter of Protection and a medical lien answer the same question: how does an injured person receive treatment now when payment can only come from a settlement later? They reach that answer through different mechanisms, and the difference matters for who carries the risk and what paperwork keeps the case collectible.
What a Letter of Protection is
A Letter of Protection (LOP) is an agreement issued by the patient's attorney to a medical provider, commonly an ER facility. It promises that the provider's bills will be paid out of the eventual settlement or verdict before the client receives their share. The provider treats immediately and is paid at settlement. The relationship is contractual, between patient, attorney and provider.
What a medical lien is
A medical lien is a legal claim against the settlement itself. Depending on the state, liens can arise by statute (hospital lien acts), or be created by agreement. A valid lien typically must be perfected, filed or recorded following the state's specific rules and deadlines, and it attaches to the recovery, meaning it generally must be resolved before settlement funds are disbursed.
The practical differences
Formation. An LOP is created by the attorney's letter and the provider's acceptance. A lien is created by statute or agreement and usually requires formal filing steps to be enforceable.
Enforcement. An LOP is enforced as a contract. A statutory lien is enforced against the settlement fund itself, which can give it stronger teeth, if it was perfected correctly.
Risk. Under both, the provider carries the risk that the case resolves for less than the bills. Clear documentation and verified records protect the provider's position in either structure.
Paperwork. This is where they differ most day to day. A lien file lives or dies on filing deadlines and recording formalities. An LOP file lives or dies on completeness: the letter itself, the itemized bills, notarized affidavits and the acceptance record.
This guide is general information, not legal advice. Lien law varies significantly by state, and perfection requirements are strict. Providers and firms should consult counsel on which structure applies to their situation.
What it means for your case file
Whichever structure your cases use, collectibility comes down to the same discipline: every document present, verified and traceable. Our case document checklist lists what a settlement-ready file contains, and our guide on how ER facilities get paid faster covers the workflow that keeps those documents moving.
SettleTrack tracks personal injury cases across the attorney, the ER facility and the notary on one shared, verified record, so nothing in the file is missing when it is time to settle. Read more about how LOP cases work, or request a demo.