A Medicare plan can have a familiar name and still handle a prescription differently in the next plan year. The safest comparison starts with the medications you actually use and checks each candidate plan against that list.
Quick Answer
Medicare Open Enrollment runs from October 15 through December 7 each year, and plan changes made by the deadline generally take effect January 1. Before switching or renewing drug coverage, compare each regular prescription against the plan’s formulary, tier, pharmacy network, preferred-pharmacy pricing, prior-authorization, step-therapy, quantity-limit rules, and expected member cost. For 2026, out-of-pocket spending on covered Part D drugs is capped at $2,100. If you use a compounded prescription, ask the plan directly how that exact prescription would be processed. Medicare does not treat every compounded preparation as automatically covered, and coverage can depend on which ingredients qualify under Part D and how the plan handles the compound.
Why the December 7 Deadline Matters
Medicare Open Enrollment is the annual period when people with Medicare can change Medicare Advantage or Medicare drug coverage. The window runs from October 15 through December 7, and changes generally take effect January 1 when the plan receives the enrollment request by the deadline.
November is the practical comparison month because there is still time to check an Annual Notice of Change, compare formularies, verify a pharmacy network, and call the plan about a specialty or compounded prescription that does not have a clear online answer.
- October 15
- Medicare Open Enrollment begins.
- December 7
- The annual Open Enrollment period ends.
- January 1
- Coverage changes generally begin for timely Open Enrollment selections.
- Before enrolling
- Review the plan’s 2026 drug coverage against the prescriptions you actually use.
Renewing the Same Plan Still Requires a Review
Compare More Than the Monthly Premium
Medicare drug plans can vary in the drugs they cover, the pharmacies they contract with, how they divide medications into tiers, and the rules they place on certain prescriptions.
A lower premium does not automatically mean lower total prescription cost. A plan may place a medication on a higher tier, require a different pharmacy, or use prior authorization, step therapy, or quantity limits that affect access.
Choose what you are comparing
Formulary & tier
Pharmacy network
Plan rules
2026 costs
- Formulary
- Each Medicare drug plan has its own list of covered drugs.
- Preferred pharmacy
- A preferred in-network pharmacy may have lower cost sharing than another pharmacy in the same network.
- Prior authorization
- The plan may require approval before it covers certain prescriptions.
- Step therapy or quantity limit
- Some plans require a different drug first or limit the amount covered over a period of time.
Ask More Than “Is My Specialty Medication Covered?”
Medicare plans often place very high-cost medications on a specialty tier. Medicare describes the specialty tier as the highest-cost tier in a common plan structure, but each plan may organize its tiers differently.
If a specialty prescription is important to your care, check the exact medication, its tier, the required pharmacy, authorization rules, and expected cost before choosing a plan.
- Exact drug
- Confirm the medication itself is on the plan’s 2026 formulary.
- Specialty pharmacy requirement
- Ask whether the plan requires a particular pharmacy or specialty-pharmacy network.
- Coverage rule
- Check for prior authorization, step therapy, quantity limits, or another plan requirement.
- Cost estimate
- Compare the expected member cost rather than relying on the tier name alone.
2026 Part D Out-of-Pocket Cap Applies to Covered Part D Drugs
Compounded Prescriptions Need a Direct Plan Question
Medicare Part D does not evaluate every compounded prescription as though it were one standard commercially available drug. CMS rules look at whether ingredients in the compound independently meet the definition of a Part D drug and whether the compound is treated as on-formulary or off-formulary under the plan’s rules.
That means a compounded prescription can require more detailed benefit verification than a standard formulary search. Ask the plan how the exact compound would be processed and which portions, if any, are eligible under the Part D benefit.
- Exact formulation
- Give the plan enough detail to identify the compounded prescription rather than asking only about one ingredient name.
- Part D components
- Ask which ingredients, if any, independently qualify for Part D coverage.
- Formulary treatment
- Ask whether the compound is treated as on-formulary, off-formulary, or subject to an exception process.
- Pharmacy participation
- Confirm whether the compounding pharmacy can process the claim under the plan’s pharmacy network.
Do Not Assume Coverage From Familiar Ingredient Names
Six Questions to Answer Before Choosing 2026 Drug Coverage
01. Is each regular prescription on the plan’s 2026 formulary?
02. Which tier is each medication on, especially any specialty prescription?
03. Is my current pharmacy in network, and is it a preferred pharmacy?
04. Does any prescription require prior authorization, step therapy, or a quantity limit?
05. How will the plan process my exact compounded prescription?
06. What will I likely pay for the prescriptions I expect to use during 2026?
Build the Plan Comparison From Your Medication List
Fireside Pharmacy can help identify current prescription names, strengths, dosage forms, refill details, and pharmacy information to have ready when you compare Medicare plans.
A Prescription-First Medicare Open Enrollment Checklist
Use the same medication list for every plan you compare so differences in coverage and cost are easier to see.
01. Gather every regular prescription you expect to use in 2026.
02. Record the current medication name, strength, dosage form, and refill pattern.
03. Check whether each prescription is on the plan’s formulary and which tier it occupies.
04. Confirm whether your pharmacy is in network and whether preferred-pharmacy pricing is available.
05. Write down prior-authorization, step-therapy, quantity-limit, or specialty-pharmacy requirements.
06. Contact the plan directly about any compounded prescription that does not have a clear coverage answer.
Frequently Asked Questions
When is Medicare Open Enrollment?
Medicare Open Enrollment runs from October 15 through December 7 each year. Plan changes made during the period generally take effect January 1 when the plan receives the request by the deadline.
Should I review my prescriptions if I plan to keep the same Medicare drug plan?
Yes. Medicare plans can change formularies, tier placement, pharmacy networks, coverage rules, and costs from one year to the next.
What is the 2026 Part D out-of-pocket cap?
The 2026 annual out-of-pocket threshold is $2,100 for covered Part D drug costs. The cap does not make noncovered prescriptions or noncovered ingredients eligible for Part D coverage.
Does Medicare Part D cover compounded prescriptions?
Some compounded prescriptions may have Part D coverage, but Medicare does not treat every compound as automatically covered. Coverage depends on whether ingredients independently qualify under Part D and how the plan handles the compound.
Can Fireside Pharmacy tell me which Medicare plan to choose?
The pharmacy can help organize current prescription details and identify questions to ask. The Medicare plan is the source for final formulary, network, authorization, cost, and compounded-prescription coverage decisions.
Do the Prescription Review Before the December 7 Deadline
Use the form above to request a call about medication details, specialty or compounded prescriptions, refill timing, transfer, pickup, or delivery.
