Your prescriptions can change which Medicare drug plan makes sense.
Medicare Part D helps cover outpatient prescription medications. But formularies, drug tiers, pharmacy networks and costs differ by plan—which means comparing coverage using your actual prescriptions matters.
How to Compare Part D ↓Drug coverage is plan-specific.
What is Medicare Part D?
Medicare Part D is optional Medicare prescription drug coverage offered through Medicare-approved private insurance plans.
Part D primarily covers outpatient prescription drugs that aren't otherwise covered under Medicare Part A or Part B.
If you use Original Medicare, you can generally obtain Part D through a separate stand-alone Medicare Prescription Drug Plan.
Most Medicare Advantage plans include Part D prescription coverage within the Medicare Advantage plan itself.
Medicare Part B covers certain drugs under specific circumstances, such as some medications administered in a physician's office or hospital outpatient setting. Part D generally covers outpatient prescriptions that aren't covered under Part B.
Prescription coverage usually fits into one of two Medicare pathways.
Stand-alone Part D plan
If you choose Original Medicare, prescription drug coverage can generally be added through a separate Medicare-approved Part D plan.
Your overall coverage may therefore look like:
- Medicare Part A
- Medicare Part B
- Separate Part D drug plan
- Optional Medigap coverage
Drug coverage may already be included
Most Medicare Advantage plans include Medicare Part D prescription coverage.
This can combine:
- Medicare Part A benefits
- Medicare Part B benefits
- Part D prescription benefits
- Potential additional plan benefits
“Does this plan cover prescriptions?” isn't specific enough.
The useful question is: How does this plan cover my particular prescriptions?
Is the drug covered?
Every Part D plan has its own formulary—the list of prescription drugs the plan covers.
What tier is it on?
Plans may organize drugs into cost-sharing tiers. Your cost may vary depending on the tier assigned to a particular medication.
Is prior authorization required?
Some drugs require plan approval before the prescription will be covered under the Part D benefit.
Does step therapy apply?
A plan may require you to try another covered medication first before covering a particular drug.
Is there a quantity limit?
Plans may limit how much medication they cover during a particular period.
Which pharmacy should I use?
Your costs can differ based on the pharmacy you choose and whether it has preferred status within the plan's network.
Make a medication list with the exact drug name, dose and how often you take it. This makes a Part D comparison substantially more useful.
Three important Part D numbers for 2026.
Individual plan premiums and cost-sharing still vary, but federal rules establish important limits within the Part D benefit.
Maximum plan deductible
For 2026, a Medicare drug plan cannot have a Part D deductible above $615. Some plans may have a lower deductible or no deductible.
Annual covered-drug out-of-pocket cap
For 2026, Part D beneficiaries do not pay more than $2,100 in qualifying out-of-pocket costs for covered Part D drugs during the calendar year.
After reaching the annual cap
Once the applicable annual Part D out-of-pocket threshold has been reached, beneficiaries owe no additional out-of-pocket cost for covered Part D drugs for the remainder of that calendar year.
Where you fill a prescription can affect what you pay.
Medicare drug plans establish pharmacy networks, and your prescription cost may vary based on which pharmacy you use.
A pharmacy may participate in a plan's network but still not offer the plan's lowest available cost sharing.
Some plans distinguish between standard network pharmacies and preferred network pharmacies.
Your neighborhood pharmacy
Convenience matters, particularly if you use the same pharmacy regularly. But confirm both participation and expected prescription cost under the specific Part D plan.
Mail-order or preferred pharmacies
Depending on the plan and medication, a preferred network or mail-order option may provide different pricing. Compare before assuming one option is automatically cheaper.
Part D can have a late-enrollment penalty.
Even someone who takes few or no prescription medications should understand the rules before declining drug coverage.
consecutive days without Part D or other creditable prescription coverage can matter.
What is “creditable prescription drug coverage”?
Creditable drug coverage is prescription coverage expected to pay, on average, at least as much as standard Medicare prescription drug coverage.
If you're eligible for Part D and go 63 consecutive days or more without Medicare prescription coverage or other creditable drug coverage, you may owe a Part D late-enrollment penalty if you enroll later.
The penalty is generally calculated based on the number of full months you went without qualifying coverage and may continue for as long as you have Medicare drug coverage.
Look for the annual notice telling you whether your coverage is “creditable.” Keep that documentation with your Medicare records.
The Medicare Prescription Payment Plan can spread costs over the year.
The Medicare Prescription Payment Plan is an optional payment arrangement available through Medicare drug plans.
It doesn't reduce the total amount you owe for prescriptions or change which drugs your plan covers.
Instead, it can spread qualifying out-of-pocket prescription costs into monthly payments over the remainder of the calendar year rather than requiring the full amount at the pharmacy counter.
The payment plan changes the timing of payments—not the underlying Part D benefit or the annual covered-drug out-of-pocket limit.
A drug plan that fits this year may not be the best fit next year.
Medication lists change. Formularies change. Premiums change. Pharmacy arrangements change. Annual review can therefore matter.
Update your medication list
Include drug name, dose, frequency and whether you expect any prescription changes.
Check every medication
Confirm formulary status, tier and plan restrictions for each important prescription.
Compare total annual cost
Don't evaluate a Part D plan using premium alone. Consider deductible, expected copays and coinsurance as well.
Review pharmacies
Check your preferred local pharmacy as well as any preferred-network or mail-order alternatives.
Look for restrictions
Prior authorization, quantity limits and step therapy can matter as much as the listed copay.
Recheck each year
Medicare drug coverage and plan details can change from one plan year to the next.
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Medicare Part D FAQs
What does Medicare Part D cover?
Medicare Part D helps cover outpatient prescription drugs that generally aren't covered under Medicare Part A or Part B. Each Medicare drug plan has its own list of covered drugs, called a formulary.
Do all Medicare Part D plans cover the same medications?
No. Each plan maintains its own formulary, although Medicare requires drug plans to cover a broad range of prescription medications and imposes additional coverage requirements for certain protected drug classes.
What is the Medicare Part D out-of-pocket limit in 2026?
For 2026, qualifying out-of-pocket costs for covered Part D medications are capped at $2,100 for the calendar year.
What is the maximum Medicare Part D deductible in 2026?
For 2026, no Medicare Part D plan may have a deductible above $615. Individual plans may have a lower deductible or no deductible.
Does Medicare Advantage include Part D?
Most Medicare Advantage plans include Medicare Part D prescription drug coverage. People using Original Medicare can generally obtain drug coverage through a stand-alone Part D plan.
What happens if I don't enroll in Part D when I'm eligible?
If you go 63 consecutive days or more after becoming eligible without Medicare drug coverage or other creditable prescription coverage, you may owe a late-enrollment penalty if you enroll in Part D later.
What is a Part D formulary?
A formulary is the plan's list of covered prescription drugs. Plans may organize covered medications into tiers and may apply requirements such as prior authorization, step therapy or quantity limits.
Can my Part D plan change its formulary?
Plan formularies and other coverage details can change. Review your plan's notices and compare coverage during applicable Medicare enrollment periods, particularly if your medications or pharmacy preferences have changed.
What is the Medicare Prescription Payment Plan?
It is an optional payment method that can spread out-of-pocket costs for Part D prescriptions across monthly payments during the calendar year. It does not reduce the total amount owed or change the medications covered by the plan.
Understand how Part D fits with the rest of Medicare.
Important: NevadaHealthPlans.com provides general educational information and is not currently acting as a licensed insurance agency. This website is not connected with or endorsed by the U.S. government or the federal Medicare program. Information on this page is not individualized insurance, medical, legal, tax or financial advice. Medicare Part D premiums, deductibles, formularies, pharmacy networks, drug tiers, restrictions and plan availability vary and can change. Verify current prescription coverage and costs using Medicare.gov, the applicable Medicare drug plan and an appropriately licensed insurance professional before making enrollment decisions.