Original Medicare vs. Medicare Advantage Comparison Tool
Figures last verified against official CMS sources in August 2026.
Quick Answer
Original Medicare (Parts A and B) offers unrestricted nationwide provider access and requires no prior authorization for most services. Medicare Advantage (Part C) is sold by private insurers who cap your annual out-of-pocket costs at up to $9,250 in 2026 but restrict you to local HMO or PPO networks and require insurance company approval — called prior authorization — before many procedures. A 2022 federal OIG (Office of Inspector General) report found that 13% of prior authorization denials in Medicare Advantage involved services that would have been covered under Original Medicare.
Original Medicare vs. Medicare Advantage Comparison Tool
Compare estimated annual costs, doctor network rules, prior authorization restrictions, and out-of-pocket risk side-by-side.
Every year during Medicare Open Enrollment, seniors are flooded with TV commercials, mailers, and phone calls pushing $0-premium Medicare Advantage plans. The commercials rarely explain network restrictions, prior authorization requirements, or how the annual out-of-pocket maximum actually works in a serious illness year. We built this independent, broker-free comparison tool to give you the full picture — both the advantages and the real limitations of each path — so you can make this decision based on your actual health situation, not an advertisement.
- Adults turning 65 deciding between Original Medicare plus Medigap and Medicare Advantage before their Initial Enrollment Period opens.
- Seniors currently in Medicare Advantage who want to compare their current plan against Original Medicare before the next Annual Enrollment Period.
- People who travel frequently or split time between states and need to understand how geography affects their coverage options.
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How to Use This Comparison Tool — Step by Step
- Step 1 — Select your expected medical care level. Choose low, moderate, or high based on your typical annual health care use. Low means generally healthy with routine preventive checkups only. Moderate means 2–4 specialist visits, one prescription, or one outpatient procedure per year. High means managing one or more chronic conditions — with regular specialist visits, multiple medications, or an anticipated hospital stay. Your honest selection here is the most important input for getting an accurate comparison.
- Step 2 — Indicate your doctor access requirements. Select whether you need the freedom to see any doctor or specialist in the United States without a referral. If you have established relationships with out-of-area specialists, if you travel frequently, or if you live part of the year in multiple states, Original Medicare with a Medigap policy is almost certainly the better fit. Medicare Advantage HMO plans require you to stay in a local network and get referrals from a primary care physician (PCP) before seeing a specialist.
- Step 3 — Enter your travel preferences. Indicate whether you travel out of state regularly or spend part of the year in a different state. This has a major impact on which option makes financial sense. An HMO-based Medicare Advantage plan provides only emergency coverage in a non-primary state. You would pay full cost out-of-pocket for routine visits in a state where your plan is not active.
- Step 4 — Click "Compare Coverage Options." The tool generates a detailed side-by-side comparison covering premiums, out-of-pocket maximum exposure, doctor network flexibility, prior authorization requirements, and specialty care access. Read both columns carefully — the differences in prior authorization and network requirements often matter far more than the monthly premium difference, especially once you have a serious health event.
💡 Pro Tip
Your Medigap Open Enrollment Period — the 6-month guaranteed issue window starting when you turn 65 and enroll in Part B — is your only guaranteed right to purchase any Medigap supplement without health questions. If you choose Medicare Advantage at 65 and want to switch back to Original Medicare plus Medigap later, you will likely face medical underwriting and could be rejected or charged much higher premiums based on conditions you developed in the meantime. Read our full guide on Medigap plan options and the guaranteed open enrollment window before making your initial Medicare choice.
Patricia is in remission from breast cancer and sees an oncologist every three months at a major cancer center. Her oncologist is not in any Medicare Advantage network in her area. She has been on Medicare Advantage for six years and is considering switching.
| Factor | Original Medicare + Plan G | Current Medicare Advantage PPO |
|---|---|---|
| Oncologist in-network? | Yes — any Medicare provider accepted | No — out-of-network, 40% coinsurance |
| Prior authorization for quarterly scans | Not required | Required every time, sometimes denied |
| Annual OOP with out-of-network care | ~$283 (Plan G deductible only) | Potentially $8,000–$12,000+ |
| Monthly Medigap G premium at age 71 | ~$185/month | N/A |
Medicare Advantage out-of-network annual cost: $8,000–$12,000+ including coinsurance for oncologist Original Medicare + Plan G annual cost: ~$2,477 with full coverage at any Medicare-accepting cancer center
Patricia switched to Original Medicare plus Medigap Plan G. A SHIP counselor helped her understand she had a guaranteed issue right when leaving Medicare Advantage during the January–March Open Enrollment Period. She saved approximately $7,000 in her first year. Find a SHIP counselor at shiphelp.org.
Frank and Eleanor spend winters in Arizona and summers in Michigan. Frank's Medicare Advantage HMO plan is based in Michigan — leaving him with only emergency coverage during six months in Arizona each year.
| Situation | Frank's HMO Experience | Original Medicare Alternative |
|---|---|---|
| Routine doctor visit in Arizona | 100% out-of-pocket (out-of-network, non-emergency) | Covered at any Medicare provider in AZ |
| Specialist referral needed in AZ | Must return to Michigan network — or pay full cost | See any specialist in AZ without referral |
| Annual cost of out-of-network visits (estimate) | $1,800–$4,000 in premium savings eaten by OOP costs | $283 Part B deductible, then Plan G covers rest |
Frank's HMO plan "savings" were entirely consumed by out-of-state out-of-pocket costs in years he needed routine care in Arizona Original Medicare + Plan G would have covered all care in both states at the $283 annual deductible
Both Frank and Eleanor switched to Original Medicare plus Medigap Plan G. They now receive complete coverage in all 50 states with any Medicare-accepting provider — the only real solution for their travel lifestyle.
These are representative examples for educational purposes. Individual costs vary by plan, ZIP code, health conditions, and actual service use. Always verify current plan details and premiums at medicare.gov/find-a-plan before making enrollment decisions.
Common Mistakes When Comparing Medicare Options
Mistake 1 — Assuming $0 Premium Means Lower Total Cost
The most common Medicare decision mistake is choosing an option based solely on the advertised monthly plan premium without calculating total annual cost including copays, coinsurance, and out-of-pocket maximum exposure. A $0-premium Medicare Advantage plan can still expose you to $9,250 per year in in-network costs if you need significant care. The premium is the least important number in the total cost equation for anyone with moderate or high health needs.
The fix is to use our Medicare Advantage vs. Original Medicare true cost checker to compare total annual cost estimates before selecting a plan. Verify current plan costs at medicare.gov/find-a-plan.
Mistake 2 — Not Verifying Your Doctors Are In-Network Every Year
Medicare Advantage provider networks change annually. A doctor who was in-network in 2025 may not be in-network in 2026. CMS reports that Medicare Advantage plans make significant network changes each year during the Annual Enrollment Period. Seniors who do not verify their specific doctors' network status before January 1 can find themselves paying out-of-network rates for care from their longtime physicians.
The fix is to call your doctors' offices directly every October to verify they are still in your specific plan's network for the upcoming year — not just in Medicare generally. Then confirm with the plan's online directory. Do this before October 15 so you have time to switch if needed. Official network verification guidance is at medicare.gov/find-a-plan.
Mistake 3 — Skipping the Medigap Window to "Try" Medicare Advantage First
Many seniors say they will try Medicare Advantage first and switch to Original Medicare plus Medigap later if they do not like it. In most states, this strategy can permanently trap you in Medicare Advantage — because once your 6-month Medigap guaranteed Open Enrollment Period closes, insurance companies can reject Medigap applications or charge much higher premiums based on health conditions developed during the Medicare Advantage trial period.
The fix is to understand your guaranteed issue rights before choosing. In most states, the guaranteed Medigap window at 65 is your only reliable opportunity to get comprehensive supplement coverage at standard rates. Read our complete Medigap comparison guide to understand what guaranteed issue means before making your initial choice.
Mistake 4 — Not Understanding Prior Authorization Requirements Before Enrollment
Prior authorization — the requirement to get insurance company approval before receiving certain services — is one of the biggest practical differences between Original Medicare and Medicare Advantage, but it is rarely discussed in advertisements. An HHS OIG (Office of Inspector General) report found that Medicare Advantage plans issue hundreds of thousands of prior authorization denials annually for services that would have been covered under Original Medicare without any approval process.
The fix is to read the Plan's Summary of Benefits (the Evidence of Coverage document) and specifically look at which services require prior authorization before enrolling. Pay particular attention to requirements for inpatient admissions, skilled nursing facility stays, and durable medical equipment. The 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 | Official comparison of Original Medicare vs. Medicare Advantage, network definitions, OOP cap rules ($9,250 maximum), and prior authorization rules | Medicare & You 2026 Official Handbook |
| CMS 2026 Medicare Advantage and Part D Advance Notice | 2026 Medicare Advantage legal maximum out-of-pocket ($9,250 in-network) and regulatory requirements for prior authorization standards | CMS 2026 MA and Part D Advance Notice |
| HHS OIG — Medicare Advantage: Questionable Prior Authorization Denials (2022 Report) | Federal audit data on prior authorization denial rates and the proportion of denials that involved services meeting Original Medicare coverage criteria | OIG Report OEI-09-18-00260 — Prior Authorization |
| CMS 2026 Medicare Parts A and B Premiums and Deductibles Fact Sheet | Standard monthly Part B premium ($202.90) and annual Part B deductible ($283) used in all cost comparisons on this page | CMS 2026 Part B Premiums and Deductibles 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 Options
What is the main difference between Original Medicare and Medicare Advantage?
Original Medicare (Parts A and B) is administered directly by the federal government and allows you to see any doctor or hospital in the United States that accepts Medicare — without a referral and without prior authorization for most services. Medicare Advantage (Part C) is sold by private insurance companies that restrict you to a local HMO (Health Maintenance Organization) or PPO (Preferred Provider Organization) network and require prior authorization approval before many tests, procedures, and hospital admissions.
Why are many Medicare Advantage plans advertised with a $0 monthly premium?
While a Medicare Advantage plan may charge $0 in additional plan premium, you must still pay your monthly Medicare Part B premium of $202.90 in 2026. The private insurance company receives a capitated payment directly from the federal government — typically over $1,000 per member per month — to manage your care. This government subsidy allows carriers to offer $0 additional premium plans and include extras like dental and gym memberships while still making a profit.
What is prior authorization in Medicare Advantage and how does it affect my care?
Prior authorization is a requirement where your doctor must obtain approval from the private insurance company before performing certain procedures, ordering imaging tests, admitting you to a hospital or skilled nursing facility, or prescribing certain medications. A 2022 HHS Office of Inspector General (OIG) report found that Medicare Advantage plans denied 13% of prior authorization requests for services that would have been automatically covered under Original Medicare.
Can I switch from Medicare Advantage back to Original Medicare?
Yes. You can switch during the Annual Enrollment Period (October 15 through December 7) or the Medicare Advantage Open Enrollment Period (January 1 through March 31). However, if you want to add a Medigap (Medicare Supplement) policy after switching back, you may be subject to full medical underwriting in most states — meaning the insurer can reject you or charge higher premiums based on your current health conditions, since your original guaranteed issue window has likely passed.
Which option is better for frequent travelers or people living in multiple states?
Original Medicare with a Medigap policy is significantly better for frequent travelers because coverage is valid nationwide with any Medicare-participating provider in all 50 states and Washington D.C. Medicare Advantage HMO plans typically cover only emergency care outside their service area. PPO plans may cover out-of-network providers at higher cost, but routine care in another state can still be very expensive or denied.
Do Medicare Advantage plans have an annual out-of-pocket maximum?
Yes — and this is one of the key differences. By federal law, Medicare Advantage plans must cap your annual in-network out-of-pocket costs. The 2026 legal maximum is $9,250 for in-network services. Many plans cap lower — at $3,500 to $6,700. Once you hit the cap, the plan pays 100% for the rest of the year. Original Medicare alone has NO annual out-of-pocket maximum, which is why most beneficiaries add a Medigap policy.
Does income affect which Medicare option I should choose?
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 begins when your reported income from two years prior exceeded $109,000 for a single filer. The surcharge is added on top of the standard $202.90 Part B premium and affects both paths the same way.
What happens to my Medicare Advantage coverage if I need emergency care while traveling?
Medicare Advantage plans are required by federal law to cover emergency and urgently needed care anywhere in the United States, even if the provider is out of network, at in-network cost-sharing rates. However, "urgent care" and "emergency care" have specific definitions. Routine appointments, specialist referrals, and follow-up care for a non-emergency while traveling are typically not covered outside the plan's service area on HMO plans.
Key Terms Used on This Page
- Part A
- Medicare hospital insurance. Covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people get Part A premium-free after 40 quarters (10 years) of Medicare tax payments.
- Part B
- Medicare medical insurance. Covers doctor visits, outpatient care, preventive services, and durable medical equipment. Monthly premium is $202.90 in 2026 for most enrollees. Part B has an annual deductible of $283 in 2026.
- Part C (Medicare Advantage)
- An alternative way to receive your Medicare benefits through a private insurance company approved and paid by Medicare. Part C plans must cover everything Parts A and B cover, but many add dental, vision, gym memberships, and Part D drug coverage. They restrict you to local networks.
- Medigap (Medicare Supplement)
- A private insurance policy that covers the cost-sharing gaps in Original Medicare — primarily the 20% Part B coinsurance, Part A hospital deductibles, and skilled nursing facility copays. Plan G is the most comprehensive option for new enrollees and covers all cost-sharing after the $283 annual Part B deductible.
- HMO
- Health Maintenance Organization — a Medicare Advantage plan type that requires you to use doctors in a local network and typically requires a referral from your primary care physician (PCP) before seeing a specialist. Emergency care is covered outside the network.
- PPO
- Preferred Provider Organization — a Medicare Advantage plan type with a primary local network but that allows you to see out-of-network providers at higher cost-sharing. Specialist referrals are generally not required. More flexible than HMOs but still not equivalent to Original Medicare's nationwide access.
- Prior authorization
- A requirement in Medicare Advantage plans where your doctor must obtain advance approval from the private insurance company before delivering certain medical services, tests, procedures, or medications. Original Medicare rarely requires prior authorization.
- OOP maximum
- Out-of-pocket maximum — the most you pay in a year before your plan covers 100% of covered services. Medicare Advantage plans are legally required to have an annual OOP cap of up to $9,250 in-network in 2026. Original Medicare has no annual OOP cap without a Medigap policy.
- IRMAA
- Income Related Monthly Adjustment Amount — an additional surcharge on Medicare Part B and Part D premiums for people whose income two years ago exceeded $109,000 (single filer) in 2026. IRMAA applies equally to both Original Medicare and Medicare Advantage enrollees.
- OIG
- Office of Inspector General — the independent watchdog agency within the U.S. Department of Health and Human Services. The OIG audits Medicare programs and has published landmark reports on Medicare Advantage prior authorization denial rates and billing practices.
- AEP
- Annual Enrollment Period (also called Annual Open Enrollment Period) — runs October 15 through December 7 each year. During AEP, you can switch between Original Medicare and Medicare Advantage, change Medicare Advantage plans, and change Part D drug plans. Changes take effect January 1.
Other Free Medicare Tools You May Find Useful
After comparing plan types, these are the tools seniors most commonly use next.
For a complete breakdown of all Medicare plan types, see our Medicare education hub. Before the Annual Enrollment Period (October 15 – December 7), use our true cost comparison tool to see full-year numbers for your situation. If you are considering switching to Original Medicare and adding Medigap, read our Medigap Plan G vs. Plan N comparison guide to understand your supplement options.
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.