Not Covered Is a Budget Decision. It Is Not a Verdict on the Evidence.

A denial letter and a demand letter are two different documents, written by two different people, answering two different questions. When they get read as if they answer the same question, the patient loses twice.

Two questions, routinely collapsed into one

The first question is medical: does this treatment work, for this problem, in this patient? It is answered by trials, meta-analyses and society consensus.

The second is financial: will a particular health plan pay for it? That is answered by a benefit committee deciding what to fund across an entire membership for a fixed premium pool. Plans decline to fund all sorts of things that work. The decision is about allocation.

Collapsing the second answer into the first is how “your plan will not pay for this” becomes “this does not work.” Nobody has to state the fallacy out loud for it to do its work on a claim file.

The society that wrote the guideline says the same thing about payment

ASIPP’s 2025 practice guideline on regenerative therapies for chronic low back pain runs to 119 pages, carries 19 recommendations at 100% panel agreement, and grades each lumbar indication under GRADE. Its precautions section instructs clinicians to inform patients that the costs of these treatments are mostly not covered by commercial insurance.

So the society and the insurer agree completely about payment, and disagree completely about evidence. That is the whole distinction, written by the specialty’s own guideline authors, and it is available to anyone arguing a claim file.

Prior authorization is not a promise of payment

This one costs patients real money and almost nobody says it plainly: insurers routinely reserve the right to decline a claim they authorized. Authorization is a statement about medical criteria at the time it was issued. Payment still turns on eligibility on the date of service, remaining benefits, and the plan’s own review after the claim is submitted.

Which means the useful question, asked before the service and answered in writing, is: if this authorized service is later denied, what am I responsible for? Ask it of the plan, not only of the clinic. An office can tell you what it was told. Only the plan can tell you what it will honor.

What this does to an injury claim

Adjusters do not evaluate a bill so much as score it, line by line, against a schedule that has no column for a treatment their software has not seen before. A biologic line item with no diagnosis in front of it and no outcome behind it is the easiest reduction in the file. How that scoring actually works.

What answers it is not indignation. It is the record: the diagnosis and the test that established it, the published guidance the indication maps onto, what was injected and how it was characterized, the imaging guidance used, and function measured at intervals afterward. That converts a disputed line item into documented care delivered inside a written standard. What that record looks like.

How treatment gets paid for while a case is open

Say the unpopular part first: the bill is for services rendered, and it is owed whether the case is won or lost. A medical lien is a timing mechanism. It changes when the bill is paid. It never changes whether it is owed.

Anyone who tells you otherwise is either confused or selling treatment on a contingency that does not exist, and patients who believe it accumulate care they think is free until the day the litigation disappoints them.

In Missouri, the statutory lien at RSMo 430.225 through 430.250 defines a health practitioner to include a physician and treats clinics on the same footing as hospitals. The lien attaches to the injured person’s claim against the party who caused the injury, and it has to be perfected by certified mail with return receipt requested, sent to the party alleged liable and any known insurer, before money changes hands. A letter of protection is a separate contractual layer, not a substitute — the statute supplies the right, the letter supplies the mechanics and the attorney’s undertaking.

Missouri work injuries are carved out of that statutory lien, which is why the first question in a work case is who authorized the care. If an adjuster referred you, it is handled as authorized care. If the carrier denied the care, the denial changes the footing and the route is usually through your attorney. Why the state line matters this much.

Illinois is not Missouri. A work injury there is handled much closer to a standard medical lien than Missouri’s carve-out permits. Ask which state the injury happened in early. It changes the paperwork, never the treatment.

What to do with all of this

Get the coverage answer in writing before the service, not after. Keep the denial letter — it is evidence of what the plan decided, not evidence about the medicine. Ask your treating physician which published guideline the recommended treatment maps onto, and put the answer in your own file. And tell your attorney early if a non-covered treatment is on the plan, because a line item nobody was warned about is the one that gets cut.

Frequently asked questions

If a treatment works, why will my insurance not pay for it?

Because coverage is a budgeting decision about what a plan funds across its whole membership, made against a fixed premium pool. Plans decline to fund things that work all the time. The medical question and the payment question have different decision-makers and different criteria. Learn more: the guideline record on orthobiologics.

Does prior authorization mean my insurer has agreed to pay?

No. Insurers routinely state that authorization is not a guarantee of payment; the claim still turns on eligibility on the date of service, remaining benefits and the plan’s post-submission review. Ask, in writing and before the service, what you owe if an authorized service is later denied. Learn more: how claims get scored rather than read.

If I lose my case, do I still owe the medical bill?

Yes. The bill is for services rendered. A lien affects when it is paid, not whether it is owed, and you remain responsible whether the case succeeds or fails. Anyone describing treatment as free if you lose is describing something else. Learn more: how Missouri and Illinois differ on injury claims.

What is a letter of protection?

A contractual undertaking, usually from your attorney, that the medical bill will be addressed out of any recovery. In Missouri it sits alongside the statutory lien rather than replacing it — the statute supplies the right and the letter supplies the mechanics. Learn more: how treatment decisions show up in the claim file.

Does a denial letter hurt my injury claim?

It should not, and it is worth understanding why. A plan’s non-coverage decision is about that plan’s benefits. The value of care in an injury claim is argued from medical necessity and reasonable value, which are established by the clinical record and the published standard of care. Learn more: what a court asks of medical opinion.

Where is Injury Experts located?

Injury Experts is at 4477 Woodson Rd, Suite 202, St. Louis, MO 63134, next to Lambert International Airport, serving the St. Louis region in Missouri and Illinois. Call (314) 887-5866 or text (314) 886-5902.

Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine.

This article is for general education and is not medical advice. It does not create a physician–patient relationship. Do not start, stop, or change any medication — including opioid medication — without consulting your physician.