What Is a Preferred Drug
A preferred drug is a medication your insurance company has placed on a lower tier of its formulary, meaning it carries a lower copay or coinsurance rate than non-preferred alternatives. Insurers negotiate volume discounts with manufacturers for these drugs, then pass savings to patients as an incentive to use them instead of competing options.
On your Explanation of Benefits (EOB), preferred drugs typically show copays of $10 to $30 for a 30-day supply, while non-preferred drugs in the same class might cost $40 to $60 or more. Some plans use tiered coinsurance instead, where you pay a percentage like 20% for preferred versus 35% for non-preferred medications.
How This Affects Claims and Appeals
Insurance denials often reference formulary status. When your claim is denied because you filled a non-preferred drug, the EOB will state "not covered as written" or "requires prior authorization." This is where you have leverage in an appeal.
If your doctor prescribed a non-preferred drug because the preferred alternative failed or caused side effects, you can file an internal appeal arguing medical necessity. Include your doctor's notes stating why the preferred drug didn't work. Many state insurance regulations require insurers to cover non-preferred drugs if the preferred option is medically inappropriate for your condition. For example, if you filled omeprazole (preferred) but developed acute kidney injury, and your doctor switches you to famotidine (non-preferred), the insurer must typically cover the switch without penalty.
Prior authorization requirements also hinge on formulary placement. A preferred drug may not require prior auth, while a non-preferred one will. If your claim was denied for lack of prior auth, you can still pursue an external appeal in most states within 30 days of the denial notice.
Key Details About Preferred Drug Status
- Formularies are updated quarterly or annually, meaning a drug's preferred status can change. Check your plan's formulary directly on your insurer's website before filling a prescription.
- Preferred status varies by plan type. Medicare Part D plans, commercial plans, and Medicaid plans all maintain different formularies. A drug preferred on your employer plan may not be preferred on your spouse's plan.
- Step therapy requirements often apply to preferred drugs. Your insurer may require you to try the preferred option first and fail before covering a non-preferred drug. Document any side effects or lack of efficacy in writing to support an appeal.
- Out-of-pocket maximums include copays for preferred drugs. If you're tracking costs toward your deductible or out-of-pocket max, the lower preferred copay helps you reach it faster, which matters if you take multiple medications.
Common Questions
- Can I get my insurer to cover a non-preferred drug without appealing? Yes, if your doctor submits a prior authorization request with medical justification. Many insurers approve these requests at the prior auth stage without waiting for a denial. Ask your pharmacy to have your doctor submit the request before you fill the prescription.
- Do I have to pay the non-preferred copay upfront, or can I appeal first? Most pharmacies will ask you to pay the non-preferred copay at the register. However, if you win an appeal, your insurer should reimburse the difference between what you paid and what the preferred copay would have been. Keep your receipt.
- If a drug is preferred on my plan, does that mean my doctor recommended it? No. Preferred status is a financial decision by your insurer, not a clinical recommendation. Your doctor chooses based on your medical history, allergies, and condition. Always discuss formulary status with your doctor, not the other way around.
Related Concepts
Understanding preferred drug status is closely tied to how insurers structure medication coverage: