You are a few months into a GLP-1 and it is working. Then your employer changes plans at renewal, or you take a new job, or you turn 65. The prescription in your hand is still valid. What changes is who pays for it, and that can change on a single date.
Losing coverage partway through is one of the most common reasons people stop these medicines, and it is one of the most avoidable. A few weeks of notice is usually enough. Here is what to do, in the order that actually matters.
Find the exact date your coverage ends
Not "sometime in January". The date. Call the number on your insurance card and ask two questions: what is the last day this plan pays for my prescriptions, and is there any grace period after that. Write both answers down.
If you are leaving a job, ask HR the same question separately, because the answer is often different from what you assume. Coverage commonly runs to the last day of the month you leave rather than your final day at work. That gap can be worth three weeks of medication in either direction.
Check the new plan before you need it
Every plan publishes a list of the medicines it pays for. It is called a formulary, and you can ask for it by that name. When you get it, look for your exact medication rather than the general category. Plans routinely cover one GLP-1 and not another, so "they cover weight loss drugs" is not an answer you can rely on.
Three things are worth asking on the same call:
- Is my medication on the formulary, and on which tier?
- Does it need prior authorization?
- Is there step therapy, meaning I have to try a different medicine first?
Step therapy is the one that catches people out. A plan can technically cover your medication and still refuse to pay until you have tried something cheaper and it has not worked. Finding that out in advance gives your prescriber time to document what you have already tried.
If the new plan says no, the clock starts straight away
A denial is not the end of it. The deadlines are the part people miss, and missing one can end the appeal entirely.
For most private plans, including self insured plans through an employer:
- The plan has 15 days to answer a prior authorization request when you have not had the treatment yet, 30 days if you already had it and are asking them to pay, and 72 hours for urgent care.
- You have 180 days from the date on the denial notice to file an internal appeal. This is the date to put in your calendar. Miss it and you can lose the right to appeal at all.
- The plan then has 30 days to decide before treatment, or 60 days after.
- If waiting would put your health at serious risk you can ask for an expedited appeal, decided as fast as your condition requires and no later than 4 business days.
- If the internal appeal fails you have four months to ask for an external review by an independent reviewer. That decision takes up to 45 days, or 72 hours if expedited, and the insurer is required by law to accept it.
External review is free if your insurer uses the federal process. If it uses a state process or its own reviewer it can charge you, but no more than $25. You can also appoint someone who knows your case to file on your behalf, and your prescriber is usually the best person for that.
Two caveats worth knowing. These rules cover most private plans but not grandfathered ones, meaning coverage in place since before March 2010 that has not changed much since. And since July 1, 2026 the federal external review process has been temporarily unavailable for people whose plan uses it, which includes plans in Alabama, Florida, Georgia, Texas and Wisconsin. HHS has said it is working on a fix and will give more information about extending deadlines for anyone who was due to request a review. If your plan does not use the federal process, follow the instructions printed on your denial notice instead. (Source: HealthCare.gov, checked August 3, 2026.)
If you are moving onto Medicare
Medicare works differently from a commercial plan, and the rules changed recently in a way that helps. There is a federal programme running now that covers certain GLP-1s at a fixed monthly cost, and it does not vary by state. It also has no appeals process, which makes getting the paperwork right the first time more important than usual. Our Medicare coverage guide sets out who qualifies and what the prescriber has to submit.
If you are moving onto Medicaid instead, coverage for weight treatment genuinely does vary by state, while coverage for type 2 diabetes and two other conditions is required everywhere. The Medicaid guide has the detail, including which states have a confirmed decision on file.
If there is going to be a gap anyway
Tell your prescriber before your last covered dose, not after. That timing matters, because most of what they can do takes a little while to arrange.
Things they may be able to offer: a different medicine your new plan does cover, a manufacturer savings programme, a documented case for prior authorization on the new plan, or a considered plan for pausing rather than an abrupt stop. Which of these is realistic depends on your situation and your prescriber, so treat this as a list of questions to ask rather than a set of promises.
It is also worth being honest with yourself about what a pause can mean. In the extension of the STEP 1 trial of semaglutide, people who came off the medication regained a large share of the weight they had lost over the following year. That is one trial and it does not predict any individual, but it is a good reason to treat a coverage gap as something to plan around rather than wait out.
Getting help locally
If you need a clinic that will work through this with you, or a second option while you sort out coverage, you can browse clinics by state or search by your city. Many list which insurers they work with, and you can message them directly from their page.
None of this is medical advice, and we are not your insurer. Your plan documents and your prescriber are the two sources that actually decide what happens next. What we can tell you is that almost everyone who loses coverage mid treatment finds out too late to do much about it, and a single phone call a few weeks early changes that.