What Is Medicare Part C?
Medicare Part C is the section of the Medicare program that allows private insurance companies, approved by the federal government, to deliver your Medicare benefits. When you enroll in a Part C plan, the private insurer takes over the coverage that would otherwise come directly from the federal government through Original Medicare (Parts A and B).
The program is universally marketed as Medicare Advantage. The two terms are interchangeable. Every Medicare Advantage plan is a Part C plan, and every Part C plan is a Medicare Advantage plan.
To enroll in Part C, you must already be enrolled in Medicare Part A and Medicare Part B. You continue paying your Part B premium, and the private plan may charge an additional monthly premium on top of that.
Key Facts About Part C
- Part C is the official name; Medicare Advantage is the brand name
- Offered by private insurers approved and regulated by CMS
- Must include all Part A and Part B benefits
- Most plans also include Part D prescription drug coverage
- All plans have an annual out-of-pocket maximum (Original Medicare has none)
- Over 33 million Americans are enrolled in Medicare Advantage as of 2026
Medicare Part C Plan Types
Not all Part C plans work the same way. The five main plan types differ in how they structure provider networks, referral requirements, and cost-sharing. Understanding these differences is the most important step in choosing the right plan.
| Plan Type | Network | Referrals |
|---|---|---|
| HMOHealth Maintenance Organization | In-network only (except emergencies) | Required for specialists |
| PPOPreferred Provider Organization | In-network and out-of-network | Not required |
| SNPSpecial Needs Plan | Specialized network | Usually required |
| PFFSPrivate Fee-for-Service | Any provider who accepts plan terms | Not required |
| MSAMedical Savings Account | Any Medicare-approved provider | Not required |
HMO and PPO plans are the most common types available in Hillsborough County and across Florida.
What Does Medicare Part C Cover?
By law, every Medicare Advantage plan must cover everything that Original Medicare covers. Most plans go further by bundling extra benefits that Original Medicare does not provide.
All Original Medicare services (Parts A and B)
Hospital stays, doctor visits, outpatient care, preventive services, and more.
Prescription drug coverage (Part D)
Most Medicare Advantage plans include drug coverage. Standalone Part D plans are not needed if your MA plan includes drugs.
Dental care
Many plans include routine dental such as cleanings, X-rays, and fillings. Coverage varies by plan.
Vision care
Routine eye exams and an allowance toward eyeglasses or contact lenses are common extras.
Hearing aids
Many plans offer an annual allowance toward hearing aids, which Original Medicare does not cover.
Fitness benefits
Programs like SilverSneakers or gym memberships are included in many plans at no extra cost.
Transportation
Some plans cover rides to medical appointments.
Over-the-counter allowance
A quarterly or annual allowance for approved health items at participating stores.
What Part C Does Not Cover
Medicare Part C Costs in 2026
Part C costs vary significantly by plan, carrier, and location. The table below shows typical ranges for Hillsborough County, Florida. Always compare specific plans using the Medicare Plan Finder at medicare.gov before enrolling.
| Cost Item | Typical Range |
|---|---|
| Monthly Premium | $0 to $100+ per month |
| Part B Premium | $185/month (standard) |
| Annual Deductible | $0 to $600+ |
| Primary Care Copay | $0 to $30 |
| Specialist Copay | $20 to $60 |
| Out-of-Pocket Maximum | Up to $9,350 (in-network) |
Pro Tip
A $0 premium plan is not always the best value. Compare the annual out-of-pocket maximum, drug formulary, and provider network carefully. A plan with a small monthly premium but a lower out-of-pocket maximum may cost you less overall if you use medical services regularly. A local independent agent can run a side-by-side cost comparison for your specific situation at no charge.
Medicare Part C vs. Original Medicare
The most important decision for most new Medicare enrollees is whether to stay with Original Medicare or switch to Medicare Advantage (Part C). Here is a direct comparison of the key differences:
| Feature | Original Medicare | Medicare Advantage (Part C) |
|---|---|---|
| Administered by | Federal government (CMS) | Private insurer approved by CMS |
| Out-of-pocket maximum | None | Yes (up to $9,350 in-network in 2026) |
| Drug coverage | Separate Part D plan required | Usually included in the plan |
| Dental, vision, hearing | Not covered | Often included as extras |
| Provider network | Any Medicare-accepting provider | Network restrictions (HMO/PPO) |
| Referrals | Not required | Required for HMO plans |
| Travel coverage | Nationwide | Usually limited to service area |
| Medigap supplement | Can add Medigap to fill gaps | Cannot use Medigap with MA plan |
When Can You Enroll in Medicare Part C?
You can enroll in a Medicare Advantage plan during specific enrollment windows. Missing these windows can mean waiting up to a year before you can make changes.
Initial Enrollment Period (IEP)
7-month window around your 65th birthdayThe first opportunity to enroll in Medicare and choose a Part C plan. Starts 3 months before your birthday month and ends 3 months after.
Annual Enrollment Period (AEP)
October 15 to December 7 each yearThe main window to switch between Medicare Advantage plans, switch from Original Medicare to Medicare Advantage, or return to Original Medicare. Changes take effect January 1.
Medicare Advantage Open Enrollment Period (OEP)
January 1 to March 31 each yearIf you are already enrolled in a Medicare Advantage plan, you can make one switch to a different MA plan or return to Original Medicare. You cannot switch from Original Medicare to MA during OEP.
Special Enrollment Period (SEP)
Varies by qualifying eventTriggered by events such as losing employer coverage, moving out of your plan's service area, or qualifying for Extra Help. Learn more on our Special Enrollment Period guide.
Not Sure Which Plan Is Right for You?
A licensed Medicare specialist in Brandon and the Tampa Bay area can compare every Medicare Advantage plan available in your zip code at no cost to you. There is no obligation and no pressure.