Prescriptions
and how your plan handles them.
Most prescriptions fill the same day. When they don't, the reason — and the path to fixing it — depends entirely on which type of medication you have and which plan you're on.
Where does your medication fall?
Select a path to see the step-by-step process, what causes delays, and what to do when something stalls.
Medicare Part D prescription coverage is delivered through private plans, each with its own formulary — a list of covered drugs organized into cost tiers. Tier placement determines your copay:
| Tier | Typical drugs | Typical copay | PA required? |
|---|---|---|---|
| Tier 1 | Preferred generics | $0–$10 | Rarely |
| Tier 2 | Non-preferred generics | $10–$30 | Sometimes |
| Tier 3 | Preferred brand-name | $30–$75 | Often |
| Tier 4 | Non-preferred brand-name | $75–$150+ | Usually |
| Tier 5 | Specialty drugs | 25–33% coinsurance | Almost always |
In 2025, the annual out-of-pocket cap on covered Part D drugs is $2,000. Once you hit that threshold in a calendar year, you pay nothing for covered drugs for the rest of the year. This is a significant change from prior years and dramatically reduces catastrophic drug costs for people on expensive specialty medications.
Plans change their formularies every year. A drug that was tier 2 this year may be tier 4 next year — or removed from the formulary entirely. Review your Part D plan during open enrollment (October 15 through December 7) every year using Medicare's Plan Finder at medicare.gov, comparing plans based on your actual current medication list.
Extra Help — also called the Low Income Subsidy (LIS) — is a federal program that dramatically reduces Part D drug costs for people with limited income and resources. In 2025, Extra Help caps copays at $4.50 for generics and $11.20 for brand-name drugs for full subsidy recipients. There is no coverage gap and no late enrollment penalty.
Eligibility is based on income and assets. People who have Medicaid, a Medicare Savings Program, or SSI are automatically enrolled in Extra Help. Others must apply separately through Social Security. Millions of people who qualify are not enrolled — estimates suggest over 2 million eligible Medicare enrollees are missing out.
To check eligibility and apply: call Social Security at 1-800-772-1213, visit ssa.gov/extrahelp, or ask a SHIP counselor to assist with the application at no cost. If you have both Medicare and Medicaid, you likely already have Extra Help — confirm with your plan.
Prescription drug coverage is a mandatory Medicaid benefit — all state programs must cover outpatient prescription drugs. But the specifics vary significantly by state: formularies, preferred drug lists, prior authorization requirements, and quantity limits are all state-determined.
Most state Medicaid programs cover a broad range of medications with minimal or no cost-sharing for eligible enrollees. Managed care Medicaid plans may have their own drug formularies that differ from the state's fee-for-service formulary — if you have Medicaid through an MCO, the MCO's preferred drug list controls your coverage.
For dual eligible individuals, Medicare Part D is the primary drug coverage — Medicaid fills in gaps and cost-sharing. Dual eligibles are automatically enrolled in Extra Help, which caps their drug costs significantly.
Step therapy is a requirement that you try one or more lower-cost drugs before your plan will approve coverage for a higher-cost alternative. For example, your plan may require you to try a generic ACE inhibitor before approving coverage for a brand-name ARB. If the generic fails or causes side effects, your physician documents that outcome, and the plan is supposed to approve the next step.
Step therapy is legitimate when applied correctly — it directs patients toward evidence-based lower-cost options first. It becomes problematic when it's applied to drugs you've already tried and failed, drugs where the step therapy creates a medical risk, or when plans use it to delay necessary treatment.
Your rights: if you have a documented medical reason why step therapy is inappropriate for your specific situation — prior failed treatment, contraindication, or urgent clinical need — your physician can request a step therapy exception. Federal rules require plans to grant exceptions when medically appropriate. If denied, you have the right to appeal.
When a prescription is denied — whether at the pharmacy counter or through prior authorization — you have several options:
- Formulary exception — request that your plan cover a non-formulary drug or cover a higher-tier drug at a lower-tier cost. Your physician submits clinical documentation explaining why the standard formulary option is medically inappropriate for you.
- Step therapy exception — if you have already tried the required step therapy drug and it failed or was contraindicated, request an exception with documentation of that failure.
- Coverage determination appeal — formal appeal of a coverage denial. Under Medicare Part D, you have five levels of appeal. Under Medicaid, you have the right to a state fair hearing. Time limits apply — file promptly.
- Expedited review — if a delay in medication would seriously harm your health, request expedited review. Decision required within 72 hours under Medicare.
The most important first step: ask for the specific denial reason in writing. The reason code tells you exactly what the plan needs to approve coverage — and whether additional documentation from your physician can resolve it.
Plans change their formularies, premiums, and cost-sharing every year. The plan that was cheapest last year may not be cheapest this year — especially if your medications changed. Use Medicare's Plan Finder at medicare.gov during open enrollment (October 15 through December 7) to compare plans based on your exact current drug list. This is the single highest-value annual action for anyone with Part D coverage.
The most underused
member of your care team.
Your pharmacist is the only healthcare professional you can walk in and speak with without an appointment. They can do significantly more than fill prescriptions — and most patients never ask.
Most patients who qualify are never told this benefit exists and never contacted. To check: call the member services number on your drug plan card and ask: "Do I qualify for Medication Therapy Management, and how do I schedule the annual review?"
Sometimes cash is cheaper than your copay.
Insurance is not always the lowest-cost option for prescriptions. Knowing when to compare — and where to look — can save hundreds of dollars a year on common medications.
If you pay with a GoodRx coupon instead of your insurance, that purchase does not count toward your annual deductible or your Part D out-of-pocket maximum. For most common generics this doesn't matter — but for expensive drugs where you're working toward the $2,000 annual cap, paying through insurance even at a higher copay may save more money over the course of the year. Compare the math on expensive medications before defaulting to cash price.
Amazon Pharmacy offers competitive cash prices on generics and accepts most insurance plans including Medicare Part D. For Prime members, many generics are available at prices comparable to or lower than GoodRx. Prescriptions can be transferred from other pharmacies. Useful for mail-order convenience on stable, ongoing medications — though same-day pickup is not available.
Moderate confidence: Medicaid formulary coverage (varies significantly by state and MCO).
Verify directly: Plan-specific formularies and PA requirements · Specialty pharmacy requirements by plan · Current GoodRx and Cost Plus Drugs pricing (changes frequently).