Tier 3 drugs are non-preferred brand-name medications on your insurance plan’s drug list, or formulary. They cost more out of pocket than generics (Tier 1) and preferred brand-name drugs (Tier 2), but less than specialty medications at the highest tier. If your doctor prescribes a Tier 3 drug, you’ll typically pay a higher copayment or coinsurance than you would for a lower-tier alternative.
How Drug Tiers Work
Insurance plans organize covered medications into tiers to steer patients toward lower-cost options. While every plan structures its tiers slightly differently, a common four-tier system looks like this:
- Tier 1: Generic drugs with the lowest copayment
- Tier 2: Preferred brand-name drugs with a medium copayment
- Tier 3: Non-preferred brand-name drugs with a higher copayment
- Specialty tier: Very high-cost drugs with the highest copayment
The general rule is simple: the lower the tier, the less you pay. Some plans use five or six tiers, splitting generics into preferred and non-preferred categories or adding separate tiers for specialty injectables. But across most Medicare Part D plans and employer-sponsored insurance, Tier 3 consistently refers to brand-name drugs the plan considers non-preferred.
What “Non-Preferred” Actually Means
A drug lands on Tier 3 instead of Tier 2 based on several factors. The plan’s pharmacy benefit manager evaluates the drug’s cost relative to other medications that treat the same condition, its clinical effectiveness compared to cheaper alternatives, its availability, and sometimes logistical factors like whether it needs special storage or delivery. If a less expensive brand-name or generic drug works just as well for most patients, the pricier option gets bumped to Tier 3.
“Non-preferred” doesn’t mean the drug is inferior or dangerous. It means the insurance plan has decided that a cheaper alternative should be tried first for most people. In many cases, a Tier 3 drug and a Tier 2 drug treat the same condition equally well, but the plan negotiated a better price on the Tier 2 option. This is why the same medication can sit on Tier 2 with one insurer and Tier 3 with another.
What Tier 3 Drugs Typically Cost
Tier 3 cost-sharing varies widely depending on your plan. Some plans charge a flat copayment, often in the range of $40 to $80 per prescription, while others charge coinsurance, meaning you pay a percentage of the drug’s price rather than a fixed dollar amount. Coinsurance for Tier 3 drugs commonly falls between 25% and 50%, which can add up fast for expensive brand-name medications.
By comparison, Tier 1 generics often carry copays under $15, and Tier 2 preferred brands typically fall in the $25 to $50 range. The jump to Tier 3 can double or triple your out-of-pocket cost for a single prescription, making it worth checking whether a lower-tier alternative exists.
For Medicare Part D enrollees, a significant change took effect in 2025: annual out-of-pocket drug costs are now capped at $2,000. This means that even if you take one or more Tier 3 medications, your total spending on covered drugs in a calendar year won’t exceed that threshold. Once you hit the cap, your plan covers the rest.
Examples of Tier 3 Medications
The specific drugs placed on Tier 3 change from plan to plan and year to year, but common examples include brand-name medications that have generic or preferred-brand competitors. Drugs like Celebrex (an anti-inflammatory), Dexilant (an acid reflux medication), and Abilify (used for mental health conditions) have appeared on non-preferred or step-therapy lists because lower-cost alternatives exist in the same drug classes. A blood pressure medication like Edarbi might land on Tier 3 when older, cheaper blood pressure drugs are available on Tier 1 or Tier 2.
To find out exactly which tier your medication falls on, check your plan’s formulary. Most insurers publish a searchable drug list on their website, and Medicare plans are required to make theirs publicly available.
Step Therapy and Prior Authorization
Tier 3 drugs are more likely than lower-tier medications to come with extra hurdles before your plan will cover them. The most common is step therapy, which requires you to try a cheaper alternative first and show it didn’t work before the plan approves the Tier 3 drug. Your pharmacy or doctor’s office will usually know right away if step therapy applies.
Some Tier 3 drugs also require prior authorization, meaning your doctor needs to get approval from the insurance plan before the prescription is filled. This typically involves submitting clinical documentation explaining why the specific drug is necessary for you. These requirements add time to the process, so if you know your medication is Tier 3, it helps to ask your doctor’s office to start any paperwork early.
How to Request a Lower Tier
If your doctor believes a Tier 3 drug is the right choice for you and that preferred alternatives wouldn’t work as well or would cause side effects, you can request a tiering exception. This is a formal process that asks your plan to cover the Tier 3 drug at the lower Tier 2 cost-sharing rate.
The request can come from you, your doctor, or someone authorized to act on your behalf. Your prescriber needs to submit a supporting statement to the plan explaining that the preferred drugs would either be less effective for your condition or cause adverse effects. This statement can be submitted in writing or verbally, though the plan may ask for written follow-up.
Once the plan receives the prescriber’s statement, it must respond within 72 hours for a standard request or 24 hours for an expedited request. If the exception is granted, you’ll pay the lower copayment or coinsurance for the rest of the plan year. If it’s denied, you can appeal the decision.
Ways to Reduce Your Tier 3 Costs
Beyond tiering exceptions, a few practical strategies can lower what you pay for Tier 3 medications. The most straightforward is asking your doctor whether a Tier 1 or Tier 2 drug in the same class would work for your condition. In many cases, a generic or preferred brand treats the same problem at a fraction of the cost.
If no lower-tier alternative exists, check whether the drug manufacturer offers a copay assistance card or patient assistance program. These programs can significantly reduce your out-of-pocket cost, though they’re generally available only to people with commercial insurance, not Medicare. For Medicare beneficiaries, the $2,000 annual cap now provides a hard ceiling on total drug spending.
You can also compare formularies during open enrollment. If you take a Tier 3 drug on your current plan, another available plan might list it on Tier 2. A few minutes on Medicare’s plan finder tool or your employer’s benefits comparison can reveal meaningful savings over the course of a year.