Medicare Advantage vs. Original Medicare: True Annual Cost Comparison
Figures last verified against official CMS sources in August 2026.
Quick Answer
According to the Centers for Medicare and Medicaid Services (CMS), Original Medicare (Parts A and B) has no annual out-of-pocket cap — so most beneficiaries add a Medigap supplement. Medicare Advantage (Part C) caps in-network costs at up to $9,250 in 2026 but restricts your doctors to a local network and requires prior authorization for many services.
Expected Healthcare Usage Inputs (2026 Rules)
Original Medicare + Medigap Plan G
Part B Premium: $2,434.80/yr ($202.90/mo)
Plan G Premium: $1,680/yr
Part B Deductible: $283/yr
Estimated Total Annual Out-of-Pocket:$4,398Medicare Advantage (Part C)
Part B Premium: $2,434.80/yr ($202.90/mo)
Plan Premium: $0/yr
Estimated Copays: $170/yr
Estimated Total Annual Out-of-Pocket:$2,605Note: Decision-support estimate only. Standalone Part D drug coverage is required for Original Medicare. Always verify local network providers and plan specifics at medicare.gov/plan-compare before enrolling.
Every year, millions of Americans approaching 65 face TV commercials promising $0-premium Medicare Advantage plans that sound too good to be true. Many do not realize the trade-offs in doctor networks, prior authorization requirements, and hidden out-of-pocket costs until they actually need care. We built this independent comparison tool to show both paths with real numbers — no insurance broker, no commissions, no pressure.
- Adults turning 65 deciding between Original Medicare plus a Medigap supplement versus a Medicare Advantage plan.
- Seniors currently in Medicare Advantage who want to understand the true annual cost difference before the Annual Enrollment Period.
- Adult children helping a parent evaluate Medicare options without going through an insurance agent or broker.
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How to Use This Comparison Tool — Step by Step
- Step 1 — Select your expected care level. Choose low, moderate, or high based on how often you use medical services. Low means generally healthy with routine checkups only. Moderate means 2–3 specialist visits or one outpatient procedure per year. High means managing a chronic condition, taking regular prescriptions, or expecting a surgery or hospital stay. If you are unsure, choose moderate — it gives the most useful comparison for most seniors.
- Step 2 — Indicate your doctor preference. Select whether you need to see any doctor in the country without a referral. This matters because Medicare Advantage plans restrict you to local HMO (Health Maintenance Organization) or PPO (Preferred Provider Organization) networks. Original Medicare lets you see any doctor who accepts Medicare in all 50 states without a referral.
- Step 3 — Enter premium estimates (optional). For a personalized comparison, enter the Medigap Plan G monthly premium quoted for your age and ZIP code and the Medicare Advantage plan premium in your area. You can find Medigap quotes at medicare.gov/find-a-plan at no cost and with no account required.
- Step 4 — Click "Compare Coverage Options." The tool generates a side-by-side annual cost comparison showing estimated totals for each path under your selected care scenario. Review the out-of-pocket exposure, premium costs, and key differences. The result includes a plain-English interpretation of which option typically costs less at your care level.
💡 Pro Tip
Your Medigap Open Enrollment Period — the 6-month window beginning when you turn 65 AND are enrolled in Medicare Part B — is your only guaranteed right to buy any Medigap plan without health questions or pre-existing condition exclusions. After this window closes, insurance companies can reject you or charge much higher premiums based on your health. Read the complete Medigap enrollment rules in our Medicare guide before this window passes.
Real-Life Examples — How This Works in Practice
Here are three realistic situations showing how Original Medicare versus Medicare Advantage plays out in actual dollar terms for different seniors.
Dorothy is healthy, takes one prescription, and sees her primary care doctor twice a year. She is choosing between a $0-premium Medicare Advantage HMO and Original Medicare plus Medigap Plan G at $145/month.
| Input | Value |
|---|---|
| Care level | Low (2 primary care visits, 1 prescription) |
| Medicare Advantage plan premium | $0/month + $202.90 Part B |
| Medigap Plan G premium | $145/month + $202.90 Part B |
| Medicare Advantage copays estimated | $60 (2 visits × $30 each) |
Medicare Advantage annual cost: ~$2,495
Original Medicare + Medigap G annual cost: ~$4,175 (includes Part B deductible)
Dorothy chose Medicare Advantage because her low care needs mean the cost savings outweigh the network restrictions — but she confirmed her primary care doctor is in the plan's network first.
Harold sees a specialist quarterly, had one outpatient procedure last year, and takes three daily medications. He is evaluating whether to switch from his current Medicare Advantage PPO to Original Medicare plus Medigap.
| Input | Value |
|---|---|
| Care level | High (4 specialist visits, 1 procedure, 3 prescriptions) |
| Medicare Advantage plan OOP maximum | $6,700/year in-network |
| Medicare Advantage copays estimated | $1,200–$2,400/year |
| Medigap Plan G premium | $195/month (age-rated) |
Medicare Advantage worst-case annual cost: ~$5,039
Original Medicare + Medigap G annual cost: ~$2,597 (after Part B deductible)
Harold switched to Original Medicare plus Medigap because the higher monthly premium saves him significantly in a high-use year — and eliminates prior authorization delays for his specialist care.
Margaret splits her time between Florida in winter and Vermont in summer. Her Medicare Advantage HMO plan does not cover routine care outside its Florida network except in emergencies.
| Input | Value |
|---|---|
| Care level | Moderate (travels 6 months/year, needs multi-state access) |
| Medicare Advantage out-of-network coverage | Emergency only |
| Out-of-network doctor visit cost | 100% out-of-pocket |
| Medigap Plan G premium in her state | $160/month |
Medicare Advantage: unlimited out-of-pocket risk for any non-emergency out-of-network visit
Original Medicare + Medigap G: full coverage with any Medicare-participating doctor in all 50 states
Margaret switched to Original Medicare plus Medigap Plan G immediately. The nationwide coverage and freedom to see any doctor was worth the higher monthly premium for her travel lifestyle.
These are representative examples based on common situations. Individual results vary based on plan selection, health status, local network availability, and actual service use. Always verify current plan costs at medicare.gov/find-a-plan before making enrollment decisions.
Common Mistakes When Comparing Medicare Options
Mistake 1 — Focusing Only on the Monthly Plan Premium
Many seniors choose a $0-premium Medicare Advantage plan without calculating total annual costs. A plan with $0 monthly premium can still expose you to $9,250 per year in in-network copays and coinsurance if you need significant care. The monthly premium is only one piece of the total cost picture.
The fix is to calculate total estimated annual cost — premiums plus expected copays plus maximum out-of-pocket exposure — before selecting any plan. Use this tool's comparison feature to see the full-year picture. Verify current figures at medicare.gov/find-a-plan.
Mistake 2 — Not Confirming Your Doctors Are In-Network Before Enrolling
Switching to Medicare Advantage without verifying that your primary care doctor and specialists are in the plan's local network is one of the most common and costly mistakes seniors make. Doctors can leave networks mid-year, and seeing an out-of-network provider can mean paying 100% of the cost.
The fix is to call your doctors' offices directly and ask if they participate in the specific Medicare Advantage plan you are considering — not just Medicare in general. Then confirm this with the plan's online provider directory. A free SHIP (State Health Insurance Assistance Program) counselor can help you check network coverage at no cost — find yours at shiphelp.org.
Mistake 3 — Missing the Medigap Open Enrollment Window
Your guaranteed right to buy a Medigap supplement policy without health questions expires 6 months after you first enroll in Medicare Part B at age 65. Many seniors skip Medigap thinking they will switch to it later, only to discover they can be rejected or charged much higher premiums due to health conditions.
The fix is to make your Medicare supplement decision during the initial enrollment window. If you choose Medicare Advantage and later want to switch to Original Medicare plus Medigap, consult a SHIP counselor first to understand whether you have any guaranteed issue rights remaining. Official Medigap rules are published at medicare.gov/supplements-other-insurance.
Mistake 4 — Assuming Prior Authorization Denials Are Rare
CMS data from the Medicare Advantage program shows that plans issue hundreds of thousands of prior authorization denials each year. An independent OIG (Office of Inspector General) report found that a significant percentage of denied prior authorization requests in Medicare Advantage were for services that would have been covered under Original Medicare. For seniors managing serious conditions, this can mean dangerous delays in necessary care.
The fix is to ask your doctor how often they face prior authorization delays with the specific Medicare Advantage plan you are considering, and to review the plan's authorization requirements in its Plan Summary of Benefits. The official OIG report on prior authorization is available at oig.hhs.gov.
Official Government Sources Used in This Tool
| Source Name | What We Used It For | Direct Link |
|---|---|---|
| CMS Medicare & You Handbook 2026 | Original Medicare vs Medicare Advantage comparison rules, network definitions, and out-of-pocket cap limits ($9,250 maximum) | Medicare & You 2026 Handbook |
| CMS 2026 Medicare Advantage and Part D Advance Notice | 2026 Medicare Advantage maximum out-of-pocket limits for in-network and combined costs | CMS MA & Part D Advance Notice |
| HHS Office of Inspector General — Medicare Advantage Prior Authorization Report | Data on prior authorization denial rates and their impact on beneficiaries | OIG Prior Authorization Report |
| CMS 2026 Medicare Part B Premium and Deductible Announcement | Standard monthly Part B premium ($202.90) and annual Part B deductible ($283) used in cost comparisons | CMS 2026 Part B Premiums Fact Sheet |
Seniors Audit is an independent educational platform. We are not affiliated with, endorsed by, or connected to any government agency, insurance company, or financial services firm. All comparisons use the official formulas and current figures published by the agencies listed above. We do not receive payment for referrals, leads, or any action taken by visitors to this site.
Frequently Asked Questions About Medicare Plan Choices
What is the real cost difference between Original Medicare and Medicare Advantage?
The Centers for Medicare and Medicaid Services (CMS) reports that in 2026, Medicare Advantage plans may advertise $0 monthly plan premiums, but you still pay your Part B premium of $202.90 per month. When you factor in copays, prior authorization denials, and out-of-pocket maximums up to $9,250 per year, Original Medicare plus a Medigap Plan G (which covers the 20% Part B coinsurance) often costs less for people with moderate or serious health needs.
What does Original Medicare not cover that leaves me financially exposed?
Original Medicare alone has no annual out-of-pocket maximum. There is no cap on what you can spend in a bad year. Part A (hospital insurance) has a $1,736 deductible per benefit period in 2026, and Part B (medical insurance) covers only 80% of approved services after a $283 annual deductible. Without a Medigap policy, the remaining 20% coinsurance (which is sometimes called "the 20%") accumulates with no limit.
What is prior authorization in Medicare Advantage and why does it matter?
Prior authorization is a requirement in Medicare Advantage plans where your private insurance carrier must approve certain procedures, hospital admissions, or specialty medications before your doctor can provide the service. CMS data shows that Medicare Advantage plans issue millions of prior authorization denials each year. Original Medicare rarely requires prior authorization — your doctor orders the service and Medicare pays its share directly.
Are Medicare Advantage plans really $0 per month?
No, not completely. Even with a $0 Medicare Advantage plan premium, you still pay your monthly Medicare Part B premium of $202.90 in 2026. The $0 refers only to the additional amount the private insurance company charges on top of Part B. The insurance company receives a monthly payment directly from the federal government to manage your care, which is how they can offer low plan premiums.
What is the out-of-pocket maximum for Medicare Advantage plans in 2026?
By law, Medicare Advantage plans must cap your annual in-network out-of-pocket costs. The 2026 maximum allowed is $9,250 for in-network services. Many plans set lower caps between $3,500 and $6,700, but some plans set the cap at the full legal maximum. Always check the Plan Summary of Benefits before enrolling. Original Medicare has no annual cap without a Medigap policy.
Can I switch from Medicare Advantage back to Original Medicare?
Yes. You can switch during the Annual Enrollment Period (October 15 to December 7) or during the Medicare Advantage Open Enrollment Period (January 1 to March 31). However, if you want to add a Medigap supplement policy after switching back, insurance companies may use medical underwriting and can reject you or charge higher premiums based on your health conditions — unless you have a guaranteed issue right.
Does IRMAA (Income Related Monthly Adjustment Amount) affect both Medicare options the same way?
IRMAA (Income Related Monthly Adjustment Amount) surcharges apply to your Part B and Part D premiums equally regardless of whether you choose Original Medicare or Medicare Advantage. In 2026, IRMAA kicks in when your income from two years ago (2024) exceeded $109,000 for a single filer. The surcharge is added on top of the standard $202.90 Part B premium.
If I choose Original Medicare, do I need to buy a separate drug plan?
Yes. Original Medicare Parts A and B do not cover most prescription drugs. You must enroll in a separate Medicare Part D prescription drug plan to get drug coverage. If you do not enroll in Part D when first eligible and do not have other creditable drug coverage, you will face a permanent late enrollment penalty — 1% of the national base beneficiary premium for each month you went without coverage.
Key Terms Used on This Page
- CMS
- Centers for Medicare & Medicaid Services — the federal agency that runs Medicare and Medicaid programs.
- Part A
- Medicare hospital insurance — covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care.
- Part B
- Medicare medical insurance — covers doctor visits, outpatient care, preventive services, and durable medical equipment. Monthly premium is $202.90 in 2026.
- Part C (Medicare Advantage)
- An alternative way to get Medicare benefits through a private insurance company approved by Medicare. These plans must cover everything Parts A and B cover.
- Part D
- Medicare prescription drug coverage — a standalone drug plan sold by private insurers that you add to Original Medicare.
- Medigap (Medicare Supplement)
- A private insurance policy that fills the gaps in Original Medicare coverage — mainly the 20% coinsurance and deductibles. Plan G is the most comprehensive option for new enrollees.
- HMO
- Health Maintenance Organization — a Medicare Advantage network type that requires you to use doctors and hospitals in a local network and usually requires a referral to see a specialist.
- PPO
- Preferred Provider Organization — a Medicare Advantage network type that lets you see out-of-network providers at higher cost and usually does not require specialist referrals.
- OOP
- Out-of-Pocket — the costs you pay directly, not covered by insurance. Medicare Advantage plans cap your in-network OOP at up to $9,250 in 2026.
- IRMAA
- Income Related Monthly Adjustment Amount — an additional surcharge on top of your Part B and Part D premiums that applies when your income from two years ago exceeded $109,000 (single filer in 2026).
- OIG
- Office of Inspector General — the independent watchdog agency within the Department of Health and Human Services that investigates Medicare program issues.
- SHIP
- State Health Insurance Assistance Program — a free, federally-funded program that provides unbiased Medicare counseling through trained volunteers in every state. Find your local counselor at shiphelp.org.
Other Free Medicare Tools You May Find Useful
After comparing costs, these are the tools seniors most commonly use next.
For deeper context on all four Medicare parts, enrollment rules, and 2026 costs, explore our complete Medicare education hub — including detailed guides on Medicare Advantage pros, cons, and hidden costs, what happens if you miss your enrollment window, and how to appeal an IRMAA surcharge if your income dropped.
About This Educational Estimate: This tool is for educational purposes only. Seniors Audit uses the official formulas published by Centers for Medicare & Medicaid Services (CMS), but results are estimates based on the information you entered. Rules, rates, and eligibility thresholds change annually and vary by individual circumstance.
Always verify your specific result directly with Centers for Medicare & Medicaid Services (CMS) at 1-800-633-4227 or at www.medicare.gov before making enrollment, coverage, or financial decisions.
If you have Medicare questions, a free SHIP counselor in your state can review your specific situation at no cost — find yours at shiphelp.org.
Seniors Audit is independent and not affiliated with any government agency or insurance company. We are not affiliated with, endorsed by, or connected to any government agency, insurance company, or financial services firm. All calculations use the official formulas and current figures published by the agencies listed above. We do not receive payment for referrals, leads, or any action taken by visitors to this site. Last reviewed: August 2026.