The denial letter is designed to end the conversation. It is vague, it arrives with a fax number from 1998, and it uses the phrase “not medically necessary” about a person the reviewer has never met.
A large share of these are overturned when challenged. Most people never challenge them.
Step zero: find out whether you can win at all
Before anything else, establish which of two situations you are in.
A denial means the drug is a covered benefit and you did not meet the criteria. This is appealable and frequently winnable.
An exclusion means your plan does not cover weight-loss drugs at all. No amount of documentation creates a benefit that does not exist. Appealing an exclusion wastes months.
Ask your plan directly, in writing: Is there a weight-management pharmacy benefit under this plan, and if so what are the coverage criteria? If your coverage runs through an employer, the benefits team knows this and the pharmacy help line often does not.
Half the appeals I have watched people file were doomed on day one, because they were arguing about criteria for a benefit their plan had never purchased.
The five documents you need
Reviewers are working from a checklist. Give them the checklist, completed.
- The written denial letter. Not the phone call. The letter states the specific criterion cited and the appeal deadline. Request it if it has not arrived.
- The plan’s coverage policy for the drug. Most publish these. It tells you the exact BMI thresholds, comorbidity list, and step-therapy requirements you are being measured against.
- Documented BMI history. Ideally showing the threshold has been met over time, not just at one visit.
- Comorbidity documentation. Hypertension, prediabetes or diabetes, dyslipidaemia, obstructive sleep apnea, fatty liver disease, osteoarthritis, cardiovascular disease. Each needs to be an actual coded diagnosis in the record, not a mention in a note.
- Evidence of prior attempts. Lifestyle intervention, prior medications tried and failed, dates and outcomes. This is the criterion people most often fail on paper while having met it in life.
The letter of medical necessity
This is written by your clinician, and its quality decides most appeals. A good one is short and answers the criterion. A bad one is a passionate paragraph about how much the patient needs help.
It should contain, plainly:
- The diagnosis with its ICD code
- BMI, with dates, and the comorbidities that qualify
- What has been tried, when, and what happened
- Why this specific drug, referencing the plan’s own criteria language
- What is expected to happen without treatment
If the denial cited step therapy, the letter must say which step-therapy drug was tried, for how long, and why it was stopped. Anything else is a letter about a different question.
The escalation ladder
| Stage | What it is | Typical window |
|---|---|---|
| Peer-to-peer | Your clinician speaks directly to the plan’s medical director | Request immediately after denial |
| Internal appeal | Formal written appeal to the plan | Commonly up to 180 days from denial |
| Second internal appeal | Where the plan offers one | Per plan rules |
| External review | Independent third-party reviewer; the plan must comply with the outcome | Commonly within 4 months of final internal denial |
| Expedited review | For urgent clinical situations | Days, not months |
External review is the step people do not know exists. The reviewer is not employed by your insurer and their decision binds the plan. If you have a documented case and the plan has been unreasonable, this is where that becomes visible.
Angles people miss
The indication you apply under is frequently the whole game. A documented cardiovascular history opens a route that a weight-loss request does not — see the SELECT data and the label change — and the thresholds themselves are set out in do you qualify.
A different indication. If you have established cardiovascular disease with overweight or obesity, or diagnosed moderate-to-severe sleep apnea, the approved indication may not be weight loss at all — which sidesteps a weight-loss exclusion entirely. This is not a trick; it is a different, legitimate prescription that requires the diagnosis to actually exist and be documented.
The formulary alternative. Sometimes the plan will cover a different agent than the one prescribed. Asking which GLP-1 is on formulary is faster than fighting for the one that is not.
The employer. In self-funded plans, the employer sets the benefit, and the insurer only administers it. Benefits teams have reversed exclusions after enough employees asked. Your HR department is a stakeholder, not a bystander.
The state insurance commissioner. For fully insured plans, a complaint costs nothing and occasionally produces a very fast reconsideration.
What to expect
It takes weeks. It involves being on hold. It requires you to be the project manager of your own case, because nobody else in the system is assigned to it.
That is an indictment of how American coverage works, not advice. But while it is the system, the people who get medication are disproportionately the people who filed the second appeal.
Keep a log: every call, the date, the name of the person, the reference number. It feels excessive until the fourth call, when it becomes the only reason you have a case.
The same discipline applies on the clinical side of the file. An appeal is far stronger when it can show a documented trajectory — dose, weight, blood pressure, side effects, all dated — than when it asserts in a sentence that treatment has helped. If you are already tracking that somewhere, export it and attach it. If you are not, Zenday will produce something you can hand over, and starting today still leaves you with a real record by the time the next renewal comes round.