This tool was designed by MCUSA to allow the user to compare Medicare Advantage enrollment by County.*

For directions on how to use the MAP tool, click here


2018 and 2017 counts in top left table are total Medicare Advantage enrollees.
Eligibles refers to the total Medicare eligible population
MA % refers to the Medicare Advantage market penetration percentage


Insurers with fewer than 10 enrollees may be excluded.
Data for US territories are not included.
Certain Counties may be excluded if MA enrollment data is unreported by CMS.
All different types of Regional PPO, HCPP – 1833 Cost, SNP, etc… are grouped by the main plan types of HMO, PFFS, and PPO plans based on analyst’s decision.
Insurers with multiple DBA or aliases are consolidated according to analyst’s decision.


Data used is from April 2017 and January 2018 Medicare Advantage / Part D Contract and Enrollment data files published by

Last Updated 4/24/2018

For any inquiries or to report any issues, send an email to:

*Report compiled using CMS Medicare Advantage Contract and Enrollment Data.  For internal use of our current and future health care clients only and not to be used for public dissemination.