What Is Medicare Part D?
Medicare Part D is the prescription drug benefit available to Medicare beneficiaries.
Part D plans are offered by private insurance companies that contract with Medicare and help cover many outpatient prescription medications.
Every plan has its own list of covered medications, pharmacy network, and cost-sharing structure.
Understanding Drug Formularies
Not every Medicare Part D plan covers every medication.
Each insurance company develops its own formulary that categorizes medications into pricing levels called tiers.
Generally:
Because formularies change periodically, it’s important to review your prescription drug coverage every year.

Medicare Part D Late Enrollment Penalty
If you go 63 consecutive days or more without Medicare Part D or other creditable prescription drug coverage after becoming eligible, you may have to pay a late enrollment penalty if you enroll later.
The penalty is generally added to your monthly Part D premium and may continue for as long as you have Medicare prescription drug coverage.
Understanding your enrollment timeline is important to help avoid unnecessary costs.
Medicare Part D Enrollment Periods
You can generally enroll in or change Medicare Part D coverage during certain Medicare enrollment periods.
These include:
Annual Enrollment Period (AEP)
Typically runs from October 15 through December 7 each year, allowing eligible beneficiaries to review and make changes to their Medicare coverage for the following year.
Understanding which enrollment period applies to your situation is an important part of choosing the right plan.
Why Work with an Independent Medicare Advisor?
Selecting a prescription drug plan involves more than choosing the lowest premium.
As an independent advisor, Alvin Cabrera helps clients compare:
- Prescription drug formularies
- Pharmacy networks
- Monthly premiums
- Annual drug costs
- Medicare Advantage drug plans
- Standalone Medicare Part D plans
Representing more than 200 insurance carriers, Alvin provides objective recommendations based on your medications, healthcare needs, and retirement goals.


