Your Drug Is Not on Your 2027 Formulary: How to Get It Covered

You just checked your 2027 plan materials and your usual prescription is nowhere on the drug list, or it's suddenly in a much more expensive tier. Before you panic or assume you're stuck paying full price, know this: there is a formal process for asking your plan to make an exception, and prescriber's supporting statement is the key that unlocks it.

Why Your Drug Disappeared or Moved Tiers

Formularies (the list of drugs a plan covers) are not permanent. They are set for each plan year and reset every January 1. A drug covered in 2026 can be dropped, restricted, or moved to a pricier tier for 2027 even though nothing about your health has changed. This is normal, if frustrating, and it happens across nearly every Medicare Advantage and stand-alone Part D plan every year.

Plans are required to send an Annual Notice of Change (ANOC) that spells out what's different for the coming year, including formulary changes. For 2027 coverage, that notice must reach you no later than September 30, 2026. It's easy to skim past, but it's the earliest warning you'll get.

Three Things That Are Not the Same as "Not Covered"

Readers often assume a drug is being denied outright when really it's one of three more specific restrictions. Knowing which one you're facing changes what you ask for.

• Tier placement: The drug is still covered, just at a higher cost-sharing tier than before. You'll pay more out of pocket, but it isn't excluded.
• Quantity limits: The plan caps how much of the drug it will cover in a given time period. You can still get it, just not in unlimited amounts without extra approval.
• Step therapy: The plan requires you to try a preferred, usually less expensive drug first, before it will cover the one your prescriber chose.

Each of these is technically "covered," just with strings attached. A true formulary problem is when the drug isn't on the list at all. Reading your denial or your plan's formulary carefully will tell you which situation you're in, because the fix is different for each.

Check Every Prescription During AEP, Not After January 1

The Annual Enrollment Period (AEP) runs October 15 through December 7 each year, with any changes taking effect January 1 of the following year. For 2027 coverage, that window is October 15 through December 7, 2026, effective January 1, 2027.

This is the single best time to check every medication you take against the plan's 2027 formulary, tier by tier. Waiting until after January 1 means you may already be mid-denial before you realize there's a problem, and switching plans becomes far harder once the new year starts.

One more thing to understand clearly: doing nothing during AEP is not a neutral choice. If you don't act, you are generally renewed automatically into the same plan, but under its new plan-year terms, which may include the very formulary change that's now hurting you. "Staying the same" and "doing nothing" are not the same outcome.

If you're already enrolled in a Medicare Advantage plan and miss this window, you do have one more narrow option: the Medicare Advantage Open Enrollment Period, which runs January 1 through March 31. It allows just one change during that window, and only for people already in an MA plan on January 1: you can switch to a different MA plan, or drop MA altogether and return to Original Medicare (with the option to add a standalone Part D plan). Any new coverage begins on the first day of the month after the plan receives your request. It is not a second AEP, and it is not available to everyone, so it should be treated as a backup, not a plan.

The Path Forward: Asking for an Exception

If your drug isn't on the 2027 formulary, or it moved to a tier with cost sharing you can't manage, the formal tool is a coverage determination request to your plan. The specific version that applies here is called an exception. There are two kinds:

• Formulary exception: asking the plan to cover a drug that isn't on its formulary at all.
• Tiering exception: asking the plan to charge the cost sharing of a lower, less expensive tier for a drug that is on the formulary but placed in an expensive tier.

The Supporting Statement Is Everything

Here is the most important practical point in this entire process: an exception request cannot be approved without a supporting statement from your prescriber. This is a statement, oral or written, explaining the medical reason the request should be granted, such as that the preferred formulary drugs would not work as well for you or would cause an adverse reaction.

Without that statement, the plan has nothing to evaluate and cannot approve the exception. So your most productive move right now isn't to call the plan and argue. It's to call your prescriber's office, explain exactly what happened with the 2027 formulary, and ask them to submit a supporting statement directly to the plan.

It also matters when the clock starts. For an exception request, the plan's decision deadline runs from receipt of the prescriber's supporting statement, not from the date you first asked. That means a fast, complete statement from your prescriber genuinely speeds up your answer.

How Fast the Plan Must Decide

Once the plan has what it needs, the decision timeframes are:

• Standard request: a decision no later than 72 hours after the plan receives what it needs.
• Expedited request: a decision no later than 24 hours, available if waiting for a standard decision could seriously jeopardize your health.
• Request for payment (if you already paid out of pocket and want to be reimbursed): a decision within 14 calendar days.

Two honest caveats worth knowing up front. First, a supporting statement does not guarantee approval, it simply makes an approval possible. Second, a tiering exception cannot get you a brand-name drug at a generic's cost sharing. It can move you to a lower tier that still exists on the formulary, but it doesn't erase the basic distinction between brand and generic pricing.

If the Exception Is Denied: The Redetermination

If your plan denies the exception, you still have options. The next step is a Part D Level 1 appeal, formally called a redetermination by the plan sponsor. This is a specific term, and it's worth using it correctly: in Original Medicare and Medicare Advantage, some appeal levels use the word "reconsideration," but for Part D, this first-level appeal is a redetermination, not a reconsideration.

The deadline to file this Part D redetermination is 65 calendar days from the date on the denial notice itself, not from when you received it. That single anchor point, the date printed on the notice, makes the deadline easy to calculate without guessing when the mail arrived.

If the plan upholds its denial at that stage, your case is reviewed further by the Part D Independent Review Entity. This is a different reviewer than the one used in Original Medicare's appeal process, so don't be confused if you see different terminology used for other Medicare appeals you've encountered.

Writing a clear, well-organized appeal letter matters. If you're not sure where to start, our appeal letter template guide walks through what to include and how to structure your request so the plan has everything it needs to say yes.

Don't Assume It's a Lost Cause

It's easy to feel like a denial is the final word, but it usually isn't the end of the road. Part D appeals go through a structured, multi-level process precisely because plans don't always get the first call right, and a well-documented exception request, backed by a clear prescriber statement, is often enough to change the outcome. There is no published overturn-rate figure for Part D redeterminations cited here, but the process exists for a reason: pushing back through a redetermination, and beyond that to the Part D Independent Review Entity if needed, is a legitimate and often worthwhile step, not a formality. Don't let inertia be the reason you keep paying for a drug that could otherwise be covered.

Because plan rules, dates, and dollar amounts can change, always confirm the current details of your specific plan and any deadlines at Medicare.gov or by calling 1-800-MEDICARE before you file anything.

Already read it? A quick review helps the next person find it.

This article is general education, not legal or medical advice. Medicare rules, deadlines, and dollar amounts change; confirm the current details for your situation at Medicare.gov or by calling 1-800-MEDICARE. MedicareClaimDenied.com is not affiliated with or endorsed by Medicare, CMS, or any insurer.