Medicare Part D
Prescription Drug Plans — What You Need to Know
Original Medicare doesn't cover most prescription drugs. Part D fills that gap — but choosing the right plan for your specific medications matters a lot.
What Is Medicare Part D?
Medicare Part D is voluntary prescription drug coverage offered by private insurance companies that contract with Medicare. It helps pay for prescription medications at pharmacies and sometimes by mail order.
You can get Part D coverage two ways: as a standalone plan added to Original Medicare, or bundled into a Medicare Advantage plan that includes drug coverage (called MA-PD plans). Either way, the coverage is administered by a private insurer.
In San Diego County, there are typically many Part D standalone plans available each year. Ashley compares all of them using your actual drug list to find you the lowest total annual cost — not just the lowest premium.
Don't delay enrollment
If you don't enroll in Part D when you're first eligible and you don't have other creditable drug coverage, you may pay a late enrollment penalty for as long as you have Medicare Part D. The penalty adds 1% of the national base premium for each month you went without coverage.
Calculate your penalty →How Part D Coverage Works
Part D coverage is divided into phases. Your total costs depend on how expensive your medications are and which phase you're in.
Deductible Phase
At the start of the year, you pay 100% of your drug costs until you meet the plan's annual deductible. Not all plans have a deductible.
Initial Coverage Phase
After meeting your deductible, you share costs with the plan through copays or coinsurance for each prescription.
Catastrophic Coverage Phase
Once your total drug spending (what you and the plan pay) reaches a threshold, you enter catastrophic coverage and pay a small copay or coinsurance for the rest of the year.
Understanding Drug Tiers and Formularies
Each Part D plan has a formulary — a list of covered drugs organized into tiers. Generic drugs are typically in lower tiers with lower copays. Brand-name and specialty drugs are in higher tiers and cost more.
Before choosing a plan, it's essential to check that your specific medications are on the formulary and at what tier. A plan with a low premium might charge you significantly more for your drugs than a plan with a slightly higher premium.
This is where Ashley's help is most valuable. She enters your actual medications into a plan comparison tool and shows you the real annual cost of each plan — premium + copays combined. This often reveals that the "cheap" plan is actually more expensive.
Smart Part D Tips
Compare based on your actual medications
Each Part D plan has a formulary — a list of covered drugs. The best plan for you depends entirely on which drugs you take. A plan with a $0 premium could still cost you thousands if your medications aren't covered well.
Check your preferred pharmacy
Part D plans often have preferred pharmacy networks. Using a preferred pharmacy can significantly lower your out-of-pocket costs. Ashley checks whether plans work with your preferred pharmacy.
Don't skip Part D if you're healthy
Even if you don't take many prescriptions now, enrolling in Part D when you're first eligible avoids a late enrollment penalty — 1% of the national base premium for every month you delayed.
Review your plan every year
Drug plans change their formularies, copays, and premiums each year. Ashley reviews your coverage each fall to make sure you're still in the best plan for your medications.