Medicare 101: A Complete Beginner's Guide
Parts A, B, C & D explained in plain English — enrollment periods, Medigap, and how to choose the right plan.
What Is Medicare?
Medicare is the federal health insurance program for people 65 or older, as well as certain younger people with disabilities or specific conditions like End-Stage Renal Disease.
It is divided into four parts — A, B, C, and D — each covering a different type of care. Understanding how they work together is the key to building the right coverage strategy.
The Four Parts of Medicare
Medicare is divided into four parts. Each covers a different type of care — understanding all four is essential to building the right coverage strategy.
Hospital Insurance
Covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no premium for Part A.
- No premium for most people (40+ quarters of Medicare taxes)
- $1,632 inpatient deductible per benefit period (2024)
- Covers skilled nursing facility care up to 100 days
Medical Insurance
Covers doctor visits, outpatient care, preventive services, and durable medical equipment. Standard premium in 2024 is $174.70/month.
- Standard premium: $174.70/month in 2024
- $240 annual deductible, then 20% coinsurance
- Covers preventive screenings at no cost
Medicare Advantage
Private insurance alternative to Original Medicare that bundles Parts A, B, and usually D into one plan — often with extra benefits.
- Offered by private insurers approved by Medicare
- Often includes dental, vision, and hearing coverage
- Annual out-of-pocket maximum required by law
Prescription Drug Coverage
Standalone drug plans that work alongside Original Medicare and Medigap to cover prescription medication costs.
- Offered by private insurers approved by Medicare
- Late enrollment penalty if you go without creditable coverage
- Formularies (drug lists) vary by plan — compare carefully
Original Medicare vs. Medicare Advantage
Both paths have real trade-offs. The right choice depends on your health needs, budget, and preferred doctors.
| Feature | Original Medicare | Medicare Advantage |
|---|---|---|
| Provider Network | Any doctor/hospital that accepts Medicare | Usually limited to plan network |
| Referrals Required | No | Often yes (HMO plans) |
| Extra Benefits | None | Often includes dental, vision, hearing |
| Out-of-Pocket Max | No cap (Medigap fills gaps) | Annual cap required by law |
| Drug Coverage | Separate Part D plan needed | Usually included |
| Plan Changes | Stable year to year | Benefits can change annually |
Not sure which path is right for you? A licensed independent broker can compare both options side-by-side at no cost.
What Is Medigap (Medicare Supplement)?
Medigap plans are sold by private insurers to fill the gaps in Original Medicare — covering deductibles, coinsurance, and copayments that Medicare doesn't pay.
Plan G and Plan N are the most popular options. During your Initial Enrollment Period, you have guaranteed issue rights — meaning insurers cannot deny you or charge more based on your health history.
Medicare Enrollment Periods
Enrolling at the right time is critical — missing a window can mean permanent penalties or coverage gaps.
Initial Enrollment Period (IEP)
7 months around your 65th birthdayYour first chance to enroll in Medicare. Begins 3 months before your birthday month and ends 3 months after.
Annual Enrollment Period (AEP)
October 15 – December 7Switch between Original Medicare and Medicare Advantage, or change your Part D drug plan. Changes take effect January 1.
Special Enrollment Period (SEP)
Triggered by qualifying life eventsIf you lose employer coverage, move, or experience other qualifying events, you may enroll outside standard windows.
Medicare Advantage Open Enrollment
January 1 – March 31If you're already in a Medicare Advantage plan, you can switch to another MA plan or return to Original Medicare.
5 Common Medicare Mistakes to Avoid
These are the most costly errors we see new Medicare enrollees make — and all of them are avoidable.
Missing Your Initial Enrollment Period
Late enrollment in Part B or Part D triggers lifelong premium penalties. Enroll on time even if you don't need coverage yet.
Assuming Medicare Covers Everything
Original Medicare has no out-of-pocket maximum. Without a Medigap plan, a serious illness can cost tens of thousands.
Choosing a Plan Based on Premium Alone
A $0 premium Medicare Advantage plan may cost more in copays and network restrictions than a Medigap plan with a monthly premium.
Not Reviewing Your Plan Annually
Plan benefits, premiums, and drug formularies change every year. Review your coverage every October during AEP.
Going It Alone
Medicare is complex. A licensed independent agent can compare every option in your area at no cost to you.
Still Have Questions About Medicare?
Our licensed agents explain everything in plain English — no jargon, no pressure, no cost.