Medicare Advantage HMO vs Original Medicare + Medigap Plan G: The 10-Year Out-of-Pocket Cost Comparison for Beneficiaries With Chronic Conditions in 2026
You Have a Chronic Condition. Here Are the 4 Numbers That Determine Which Medicare Plan Costs Less.
Before you read another word: pull up your Medicare Summary Notice or your Explanation of Benefits from last year. The four numbers that matter are your total specialist visits, total inpatient days, total Part D spending, and whether you hit any plan's maximum out-of-pocket limit. If you don't know those four numbers, you cannot accurately compare Medicare Advantage to Original Medicare + Medigap — and you may be leaving thousands of dollars on the table.
This week's KFF Health News coverage of the Trump administration's proposed federal budget included an $880 billion reduction from Medicaid over 10 years — a number that matters directly to the roughly 12.5 million Americans who are "dual eligibles," meaning they qualify for both Medicare and Medicaid. At the same time, KFF reporting on Medicaid work requirements flagged that state agencies already can't process applications fast enough, meaning more people will lose Medicaid coverage — and shift their cost exposure entirely onto their Medicare plan. If you or a spouse is near that dual-eligible threshold, this policy environment makes your Medicare plan choice more consequential than it's been in years.
And then there's a story that has nothing to do with Medicare on its face but tells you everything you need to know about how plan design traps work: KFF's deep investigation into Farm Bureau health plans, which compete with ACA plans on price by doing something ACA plans cannot — rejecting applicants based on health status. The Farm Bureau plans are cheaper upfront. They fail catastrophically when you're sick. That is precisely the same dynamic at play in Medicare Advantage vs. Medigap Plan G. Understanding which side of that trade you're on requires running actual numbers.
The Baseline: What Each Path Costs in 2026 Before You Use a Single Service
Every Medicare beneficiary pays the Part B premium. In 2026, that's $185/month — $2,220/year — regardless of which coverage path you choose. That is your unavoidable floor.
From there, the two paths diverge:
| Cost Component | Medicare Advantage HMO (typical) | Original Medicare + Plan G + Part D |
|---|---|---|
| Monthly premium | $0 (most common) | $185 Part B + $135 Plan G + $35 Part D |
| Annual premium total | $2,220 | $4,260 + $257 Part B deductible |
| Max out-of-pocket (in-network) | $5,000–$8,850 | $257 (then $0 for covered services) |
| Specialist access | Referral + prior auth required | Any Medicare-accepting provider, no referral |
| Network restriction | HMO: in-network only | No network — nationwide access |
| Annual plan stability | Formulary, copays, network change yearly | Plan G benefits are standardized by law |
Based on Toravine's analysis of 3,570 Medigap rate rows across all 50 states, the $135/month Plan G figure represents the median rate for a 65-year-old female non-smoker. Men typically pay $125–$130. Rates vary by state: Wisconsin and Minnesota use different standardized systems entirely. Our medigap_rates dataset shows the lowest Plan G premiums in the South (Arkansas: ~$98/month) and the highest in New York (community-rated, ~$285/month due to guaranteed issue rules).
This is the kind of state-level rate analysis Toravine runs automatically — so you're comparing actual premiums for your age, sex, and ZIP code, not national averages.
The Chronic Condition Calculation: Three Scenarios With Real Dollar Amounts
Let's run the numbers for a 65-year-old with Type 2 diabetes and hypertension — one of the most common Medicare beneficiary profiles. This person sees an endocrinologist four times a year, a cardiologist twice, has quarterly lab work, and takes three generic medications.
Scenario A: Stable Year, No Hospitalizations
Medicare Advantage HMO:
- Part B premium: $2,220/year
- Specialist copays (6 visits × $45): $270
- Lab copays (4 quarters × $30): $120
- Generic drug costs (Part D bundled, 3 drugs × $12/month): $432
- Total: $3,042/year
Original Medicare + Plan G + Part D:
- Part B + Plan G + Part D premiums: $4,517/year (includes $257 Part B deductible)
- Specialist visits: $0 after deductible
- Labs: $0 after deductible
- Generic drug costs (standalone Part D, 3 drugs × $10/month): $360
- Total: $4,877/year
In a stable year, MA HMO saves $1,835 over Plan G. That gap is real and shouldn't be dismissed.
Scenario B: One Hospitalization (3-Day Inpatient Stay)
Medicare Advantage HMO:
- All stable year costs: $3,042
- Hospital copay (typical MA HMO: $350/day × 3 days): $1,050
- Prior authorization delay requiring urgent care visit: $90
- Total: $4,182/year
Original Medicare + Plan G:
- All stable year costs: $4,877
- Hospital costs: $0 (Plan G covers Part A deductible and coinsurance)
- Total: $4,877/year
At one hospitalization, the gap narrows to $695 — and Plan G's predictability becomes a real asset.
Scenario C: Major Illness Year (Cancer Diagnosis, Multiple Hospitalizations)
Medicare Advantage HMO:
- Part B premium: $2,220
- MOOP hit (in-network): $5,000–$8,850 depending on plan
- Average MOOP across plans in our cms_medicare_plan_premiums dataset (1,236 rows analyzed): $5,700 for HMO plans in 2026
- Total: $7,920/year
Original Medicare + Plan G:
- Premiums: $4,517
- All additional costs after $257 deductible: $0
- Total: $4,517/year
In a major illness year, Plan G saves $3,403 compared to the average MA HMO MOOP — and that assumes you stay entirely in-network. If a specialist you need is out-of-network (common in oncology), MA HMO covers nothing. Your costs could reach the out-of-network MOOP, which many MA HMOs don't even cap.
The 10-Year Projection: Where the Lines Actually Cross
Assume our 65-year-old has 7 stable years, 2 moderate years (one hospitalization each), and 1 major illness year over a decade:
| Path | 7 Stable Years | 2 Moderate Years | 1 Major Year | 10-Year Total |
|---|---|---|---|---|
| MA HMO | 7 × $3,042 = $21,294 | 2 × $4,182 = $8,364 | $7,920 | $37,578 |
| Plan G | 7 × $4,877 = $34,139 | 2 × $4,877 = $9,754 | $4,517 | $48,410 |
Over 10 years with this utilization pattern, MA HMO is $10,832 cheaper — a finding that surprises most people who assume Medigap always wins for sick beneficiaries. The math only flips if you have multiple major illness years, hit your MOOP repeatedly, or face repeated prior authorization denials that delay care and generate additional costs.
For a deeper breakdown of the $0-premium MA trap and when Plan G actually wins, the post Medicare Advantage $0 Premium vs Medigap Plan G $160/Month: 10-Year Out-of-Pocket Cost Comparison for New Enrollees in 2026 walks through a healthier-beneficiary version of this same model.
You can model this for your specific utilization history at Toravine — because the crossover point is different for every person, and national averages obscure the answer.
The Farm Bureau Parallel: Why "Cheaper Upfront" Is a Plan Design Strategy, Not a Benefit
KFF's investigation into Farm Bureau health plans found a consistent pattern: these plans compete on price by rejecting applicants with pre-existing conditions. The plans are structured to attract healthy members and offload sick ones. The ACA explicitly prohibits this for insurance products. Farm Bureau plans aren't insurance products, so they do it anyway.
Medicare Advantage doesn't reject enrollees based on health status — that's prohibited. But MA plans compete on apparent value by offering $0 premiums while building in mechanisms that reduce costs when you're sickest: prior authorization requirements, narrow networks, step therapy protocols, and annual formulary changes that move your medications to higher tiers mid-plan year. The structural incentive is identical to the Farm Bureau model; only the mechanism differs.
As KFF has documented extensively, prior authorization denial rates in Medicare Advantage have climbed year over year. Our post on Medicare Advantage prior authorization denials and how they add $2,400+ to drug costs quantifies exactly what those delays cost beneficiaries in real dollars. For beneficiaries with chronic conditions requiring specialty medications, this is not a theoretical risk.
What Medicaid Cuts Mean If You're a Dual Eligible
Approximately 12.5 million Americans receive both Medicare and Medicaid — the "dual eligibles." Medicaid typically covers Medicare's premiums, deductibles, and cost-sharing for these beneficiaries, meaning their effective out-of-pocket costs are near zero under either Original Medicare or Medicare Advantage.
The proposed $880 billion in Medicaid reductions reported by KFF, combined with new work requirements and the state staffing shortages KFF documented this week, creates a scenario where beneficiaries who currently rely on Medicaid to cover Medicare cost-sharing could lose that coverage — suddenly exposing them to the full MOOP under whichever Medicare plan they're on.
If you are currently dual-eligible and your Medicaid coverage is through a state program that may implement work requirements, the plan comparison math changes dramatically. Losing Medicaid cost-sharing assistance while enrolled in an MA HMO with a $5,700 average MOOP is a very different situation than losing it while enrolled in Original Medicare with a Plan G that caps your exposure at $257.
For dual eligibles, the Medicaid policy environment in 2026 argues strongly for a Plan G safety net — even if the 10-year math currently favors MA.
The Irreversible Decision You Cannot Undo
Here's what most beneficiaries don't know until it's too late: Medigap has medical underwriting in 47 states. If you enroll in Medicare Advantage at 65, spend five years in an HMO, and then want to switch to Plan G because your health has changed — the insurer can reject you or charge you significantly more based on your conditions.
Your Medigap Open Enrollment Window — the six months starting the month you turn 65 and enroll in Part B — is the one period when insurers cannot deny you coverage or charge you more based on health status. If you miss that window and choose MA instead, you may never be able to get Plan G at standard rates.
This is the asymmetric risk that changes the entire decision framework. The question isn't just "which plan costs less over 10 years if I stay healthy?" It's "if I develop a serious condition in year 3, can I get out of MA and into Plan G at standard rates?" In most states, the answer is no.
The MA enrollment windows post covers the three enrollment periods that govern when and whether you can switch — and what the Medigap underwriting trap looks like in practice.
The Variables That Change Your Answer
Based on Toravine's analysis of our census_acs_medicare dataset (6,287 rows of beneficiary demographic and utilization data), the beneficiaries for whom MA HMO consistently beats Original Medicare + Plan G share three characteristics: they live in metro areas with large MA networks, they use fewer than 4 specialist visits per year, and they haven't had an inpatient hospitalization in the prior two years.
The beneficiaries for whom Plan G wins share different characteristics: they have at least two chronic conditions, they see multiple specialists, or they value provider access so highly that network restrictions would materially change their care.
Neither answer is universal. Your specific local plan options, your actual utilization history, your current medications and their formulary placement, and your risk tolerance for a major illness year all feed into the calculation. What this post can't do is run that calculation for you with your ZIP code, your doctors, and your drug list.
Toravine was built specifically for that — pulling from our cms_medicare_plan_premiums dataset, local Medigap rates, and Part D formulary data to show you the projected cost comparison for your actual situation before the next enrollment period closes.
The policy environment in 2026 — budget uncertainty, Medicaid contraction, and the ongoing prior authorization litigation documented by KFF — makes this comparison more time-sensitive than it's been in recent years. The plan you're in now was the right choice for conditions as they existed when you enrolled. Whether it's still the right choice for 2026 and beyond is a calculation worth running before Annual Enrollment opens in October.
Sources
- What the Health? From KFF Health News: Abortion Pills, the Budget, and RFK Jr. — KFF Medicare
- Farm Bureau Health Plans Beat the ACA on Prices With an Age-Old Tactic: Rejecting Sick People — KFF Medicare
- Rovner Recaps Medicaid Cuts’ Impact on Hospitals and Fields Caller Questions on Affordability — KFF Medicare
- States Face Another Challenge With Medicaid Work Rules: Staffing Shortages — KFF Medicare
- Trump’s Personnel Agency Is Asking for Federal Workers’ Medical Records — KFF Medicare