Enrollment Period
What Does This Stand For
When To Enroll
Medicare Basics
100

falls between October 15 - December 7, add, drop, or switch your MA or prescription

Annual Enrollment Period (AEP)

100

SEP

Special Enrollment Period

100

When you turn 65 or otherwise become eligible for Medicare for the first time.

Initial Enrollment Period (IEP)

100

Covers inpatient hospitalization

Part A

200

Depending on certain circumstances, you may be able to enroll in a Medicare Plan outside of the initial enrollment or annual enrollment time frames

Special Enrollment Period (SEP)

200

IEP

Initial Enrollment Period


200

You can enroll in ORiginal Medicare between Jan 1 - Mar 31.  You can enroll in a MA Part C or Part D plan between April 1 - June 30,

General Enrollment Period (GEP)

200

Covers prescription drugs

Part D

300

falls within January 1 - March 31, and gives people who missed signing up for Medicare during IEP another opportunity to sign up

General Enrollment Period (GEP)

300

KVB

Kim Vy Bui

300

You may be able to enroll in or switch plans outside of the Open Enrollment Period if you have a major change in your life event.

Special Enrollment Period (SEP)

300

Covers outpatient medical services

Part B

400

7 months long, includes your 65th birthday month plus the 3 months before and the 3 months after 

Initial Enrollment Period (IEP)

400

MAPD

Medicare Advantage Prescription Drug

400

Enrollment period between Oct 15 - Dec 7.  During this time you can switch MA and part D plans.

Open Enrollment Period (OEP)

400

Often referred to as Medicare Advantage plan

Part C

500

January 1st to March 31st; time when anyone eligible for Medicare can enroll in, change, or unenroll from a Medicare Advantage Plan or a Prescription Drug Plan

Open Enrollment Period (OEP)

500

IRMAA

Income Related Monthly Adjustment Amount

500

Another name of Open Enrollment Period then you switch Medicare Advantage and Part D plans.

Annual Enrollment Period (AEP)

500
When an individual is enrolled in Part A and Part B

Original Medicare