External review is your escalation after internal appeals are exhausted. An independent reviewer with no employment relationship to your insurer examines the case, and the decision binds the plan. If they overturn the denial, the insurer must cover the drug. It costs you nothing, and it is substantially underused.
This is one part of getting a GLP-1 covered. For the full picture, see GLP-1 Insurance Coverage: The Complete Guide.
What makes external review different
Every appeal before this point is decided by the insurer reviewing its own decision. External review moves the decision outside the company, to an independent review organization assigned to the case.
Two features matter. The reviewer has no financial stake in the outcome. And the determination binds the plan, so this is not an advisory opinion the insurer can decline to follow.
When you are eligible
Generally after you have completed the plan’s internal appeal process. Some plans have one internal level, some have two, and the denial letters tell you which stage you are at.
There are exceptions that let you skip ahead. If the plan failed to follow its own procedures or missed its own deadlines, you may be able to proceed directly. If your situation is urgent, an expedited external review can sometimes run alongside the internal appeal rather than after it.
What it can and cannot overturn
This distinction decides whether external review is worth your time, and it is the thing most people get wrong.
| Denial reason | External review prospects |
|---|---|
| Not medically necessary | Good fit. A clinical judgment, which is what an independent clinical reviewer exists to re-examine. |
| Criteria not met | Good fit, particularly where you can now show the criteria were in fact met. |
| Experimental or investigational | Good fit. Expressly within scope. |
| Benefit exclusion, plan does not cover the drug class | Poor fit. A contract term, not a clinical decision. There is no medical judgment to review. |
If your denial rests on an exclusion, external review is usually the wrong tool. The route is your employer at the next plan year.
How to file
Your final internal denial letter must explain how to request external review and state the deadline. Read it before doing anything else. The process and the filing window depend on your plan type and your state, and the letter is the authoritative source for your case.
Depending on plan type, the request goes either to your state insurance department or through a federally administered process. Self-funded employer plans typically use a federal pathway; fully insured plans usually go through the state. If the letter is unclear, call the number on it and ask which applies to you.
What to submit
Send more than the form asks for. The reviewer sees only what reaches them.
- Every denial letter, in sequence
- The plan’s written clinical criteria, which you can request if you do not have it
- Your prescriber’s letter of medical necessity, updated to address the specific reason in the final denial
- Clinic notes showing measured BMI and coded comorbidities
- Documentation of prior weight management attempts
- Relevant labs, sleep studies or imaging
- Published clinical evidence supporting the treatment in your circumstances
A short cover letter that quotes the denial reason and states, point by point, what in the enclosed record answers it, is worth writing. Reviewers work through volume.
While you wait
Ask your prescriber whether a clinically appropriate alternative exists that your plan does cover, so you are not simply untreated during the process. That is a conversation to have with them rather than a decision to make alone.
Check what your denial actually says first, because a benefit exclusion is a contract term with no clinical judgement to review. Where the plan mishandled the process itself, a complaint to your state insurance commissioner is the better tool.
Frequently asked questions
Does it cost anything?
Standard external review is free to you. Some states permit a nominal filing fee, typically refundable if you prevail.
How long does it take?
Standard and expedited reviews run to different timelines set by regulation. Your denial letter states the ones that apply to your plan.
What if the reviewer sides with the insurer?
The determination is generally final within the appeals process. Remaining options are your state insurance commissioner if procedures were mishandled, your employer if the plan is self-funded, or legal advice.
Can my doctor file it?
In most cases yes, as your authorized representative, though authorization paperwork is usually required.
Does this apply to Medicare?
Medicare has its own multi-level appeals structure that works differently. If you are on Part D, follow the process described in your denial notice.
How often do these succeed?
Overturn rates vary considerably by state, insurer and denial type. Check whether your state insurance department publishes its own data, because several do.