Medicare Part C, also known as Medicare Advantage, is an all-in-one private alternative to Original Medicare. These plans bundle Part A, Part B, and usually Part D into a single package. While provided by private insurers, they are strictly regulated and approved by Medicare.
You can enroll in, switch, drop, or change a Medicare Advantage Plan. To join a Medicare Advantage Plan, you must be enrolled in both Medicare Part A and Part B:
| Enrollment Period | Timing | Coverage Start | Key Notes |
|---|---|---|---|
| Initial Enrollment Period (IEP) | 3 months before and after the 65th birthday month (7 months) | Varies by time of application (typically 1st day of birthday month) | Must have both Part A and Part B to apply. Next l the AEP. |
| Annual Enrollment Period (AEP) | October 15 – December 7 | January 1 of the following year | Critical period for maintaining, changing, or dropping existing plans. |
| Open Enrollment Period (OEP) | January 1 – March 31 every year | The 1st of the month following application | Only applicable to those with a Medicare Advantage plan. May switch to a different Advantage plan or return to Original Medicare once during this period. |
| Special Enrollment Period (SEP) | Triggered when qualifying events occur | Varies by case; Generally within 2 months from the date of the qualifying event | Used when your existing coverage suddenly ends, if you relocate out of state, or changes in eligibility. |
Your Medicare Advantage plan will automatically renew (rollover) each year without requiring a new application.