Understanding Your Medicare Options
Medicare isn't one plan — it's a system of parts you combine based on your needs. Original Medicare (Part A hospital + Part B medical) is run directly by the federal government. From there, you choose either a Medicare Advantage plan (Part C, sold by private insurers, often bundling Part D drug coverage) or Original Medicare plus a separate Part D drug plan and optionally a Medigap supplement to cover the gaps.
Top Medicare Advantage Insurers Compared
| Insurer | Best For | Typical Premium | Network Size | Rating |
|---|---|---|---|---|
| UnitedHealthcare | Largest overall enrollment, AARP branding | $0–$50/mo | Nationwide, largest MA network | ⭐ 4.6 |
| Humana | Extra benefits (dental/vision/hearing) | $0–$45/mo | Second-largest MA network | ⭐ 4.5 |
| Aetna (CVS Health) | CVS pharmacy integration | $0–$40/mo | Strong nationwide presence | ⭐ 4.4 |
| Blue Cross Blue Shield | Regional network strength | Varies by state affiliate | Strong in-state networks | ⭐ 4.5 |
| Kaiser Permanente | Integrated care, member satisfaction | Competitive, region-limited | Available in select states only | ⭐ 4.7 |
Key Factors to Consider
- Original Medicare vs. Medicare Advantage: Original Medicare offers freedom to see any provider that accepts Medicare nationwide; Medicare Advantage plans use HMO/PPO networks but often include extra benefits and lower premiums
- Part D drug coverage: Check that your specific medications are on the plan's formulary before enrolling — formularies vary significantly between plans
- Medigap eligibility timing: Medigap plans have the best guaranteed-issue rates during your 6-month Medigap Open Enrollment Period starting when you're 65 and enrolled in Part B — missing this window can mean medical underwriting later
- Star ratings: Medicare rates Advantage and Part D plans 1–5 stars annually based on quality and member satisfaction — a useful independent comparison point
- Provider network: Confirm your doctors and preferred hospitals are in-network before switching to a Medicare Advantage plan
When You Can Enroll
Your Initial Enrollment Period runs 7 months around your 65th birthday (3 months before, your birthday month, and 3 months after). The Medicare Annual Enrollment Period runs October 15 – December 7 each year, when you can switch Advantage or Part D plans for the following year. The Medicare Advantage Open Enrollment Period (January 1 – March 31) lets those already in an Advantage plan switch plans or return to Original Medicare once.
Missing your Initial Enrollment Period without other creditable coverage can trigger permanent late-enrollment penalties on Part B and Part D — these penalties are added to your premium for as long as you have Medicare, so enrolling on time matters more than with typical private insurance.
Frequently Asked Questions
Medicare Advantage replaces Original Medicare with a private plan, often at a lower premium with extra benefits but network restrictions. Medigap works alongside Original Medicare to cover its deductibles and coinsurance — you can't have both at the same time.
Part A is usually premium-free if you or a spouse paid Medicare taxes for at least 10 years. Part B carries a standard monthly premium, and Medicare Advantage, Part D, and Medigap plans all have their own separate premiums.
You may face permanent late-enrollment penalties added to your Part B and Part D premiums for as long as you have Medicare, unless you had other creditable coverage (like an employer plan) that delayed your need to enroll.