MedicarePartD.guide

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Which pharmacies do Medicare Part D plans use?

Pharmacies and Part D · updated Jun 7, 2025

Almost all major pharmacies.  Most Medicare Part D plans offered by companies like Humana or UnitedHealthCare/AARP have 50,000 to 60,000 pharmacies in their plan network.
 
Because of the huge number of existing pharmacies (and the always increasing number of pharmacies being added to Part D plan networks), most plans no longer distribute printed copies of their Pharmacy Directory (directories can be outdated as soon as printed).

Instead, Medicare Part D plan providers have online tools that you can access from the plan's website.

The Medicare Part D plan's pharmacy search link and the toll-free Member Services telephone number for most Medicare Part D plans can be found by clicking on the plan name or "Benefits & Contact Info" button on the this site PDP-Finder.com and MA-Finder.com plan finder tools. 

How to see more details about a specific Medicare Part D prescription drug plan

Both links will take you to a page showing more Part D plan details such as formulary information (number of drugs per tier), cost-sharing, pharmacy search link, basic enrollment information, Star ratings, and the toll-free Member Services number for every Medicare Part D plan.

Details of a specific Medicare Part D prescription drug plan



You can telephone your plan's Member Services department for more information on local network pharmacies or ask the Member Services representative where you can find the link to the plan's Pharmacy Search tool.  The toll-free number for Member Services is on your Member ID card or most of your plan's printed information. Alternatively, 

When connected with Member Services, be sure to also ask about the cost-sharing price differences between preferred network pharmacies and non-preferred network pharmacies. Or to see a chart of both 30- and 90-day supply cost sharing for preferred network pharmacies and non-preferred network pharmacies, you can click the Rx$ button under the plan name on our PDP-Finder.com plan finder.

PDP-Finder location of cost-sharing details button