Medicare Advantage $8,850 MOOP vs Medigap Plan G Near-Zero Out-of-Pocket: The 2026 Cost Math for an $85,000 Necrotizing Fasciitis Hospitalization
You don't get to pick when a screwworm outbreak, a Vibrio infection from warm coastal water, or a run-of-the-mill cut that turns into necrotizing fasciitis shows up on your calendar. But you do get to pick, right now, which Medicare plan pays for it. And based on Toravine's analysis of our medigap_rates dataset (3,570 rows) and cms_medicare_plan_premiums dataset (1,236 rows), that choice can swing your out-of-pocket exposure for a single hospitalization by more than $8,000 — and your ability to fix a bad choice later can disappear the moment you're diagnosed.
Here's the decision moment: KFF Health News recently reported that deep cuts to federal public health programs are coinciding with the reemergence of disease threats the CDC used to catch early — screwworm, flesh-eating bacteria, and other conditions that depend on surveillance infrastructure now running thinner than it has in decades. Whether or not you believe your personal risk has changed, the math you need to run is the same math beneficiaries have always needed to run before Fall Open Enrollment or before a Medigap application: what does one serious hospitalization actually cost me under my current plan, and can I still switch if the answer scares me?
The $85,000 hospitalization, priced two ways
Necrotizing fasciitis treatment — debridement surgery, ICU time, IV antibiotics, possibly a skin graft — routinely bills in the $60,000–$110,000 range depending on length of stay and whether a specialty wound center is involved. Let's use $85,000 as a representative total billed amount and price it under both major Medicare paths for 2026.
Original Medicare + Medigap Plan G. You hit the Part A deductible ($1,676 in 2026) and the Part B deductible ($257 in 2026), and Plan G — the most comprehensive Medigap plan still open to new enrollees — covers both, plus the 20% Part B coinsurance and all Part A hospital coinsurance. Your direct cost-sharing on an $85,000 admission: $0, because Plan G paid the deductibles for you. You already paid for that protection through your monthly premium.
Medicare Advantage. You owe cost-sharing up to your plan's maximum out-of-pocket limit — CMS caps in-network MOOP at $9,350 for 2026, though our cms_medicare_plan_premiums data shows most plans set theirs closer to $6,700–$8,850 to stay competitive. If the debridement and wound care happen entirely in-network, you're out roughly $8,850. If your local hospital doesn't have an in-network burn or infectious disease specialist — a real gap in rural service areas, per our census_acs_medicare county-level data — and you're transferred out-of-network, some MA plans apply a separate, higher combined MOOP that can run $13,000 or more, and the transfer itself may require prior authorization first.
That last point matters more than it sounds. We've covered elsewhere how the OIG's 95% denial overturn rate plays out for skilled nursing transfers — the same friction applies to emergency specialty transfers. A denial that gets overturned on appeal still costs you the days you spent waiting, and necrotizing fasciitis is a condition where days matter clinically, not just financially.
| Scenario | Original Medicare + Plan G | Medicare Advantage (in-network) | Medicare Advantage (out-of-network) |
|---|---|---|---|
| Billed charges | $85,000 | $85,000 | $85,000 |
| Your direct cost-sharing | $0 (deductibles covered by Plan G) | ~$8,850 (MOOP) | $13,000+ possible |
| Prior authorization risk | None (Original Medicare doesn't require it for emergency care) | Possible delay for specialty transfer | Higher — network gap triggers review |
| Monthly premium (national avg.) | $178 (Plan G) | $0–$35 | $0–$35 |
This is the kind of analysis Toravine runs for you automatically — plugging in your zip code, your plan's actual MOOP, and your local hospital network so you're not estimating from a national average.
The premium you pay no matter which plan you pick: IRMAA
Whichever path you choose, your Part B premium is set by income, not plan type — and that's the layer people forget to model. Based on our cms_medicare_irmaa dataset (174 rows), 2026 Part B premiums by income bracket look like this for single filers:
| 2026 Modified AGI (single) | Monthly Part B premium | Annual Part B cost |
|---|---|---|
| $106,000 or less | $185.00 | $2,220 |
| $106,000–$133,000 | $259.00 | $3,108 |
| $133,000–$167,000 | $370.00 | $4,440 |
| $167,000–$200,000 | $481.00 | $5,772 |
| $200,000–$500,000 | $592.00 | $7,104 |
| $500,000+ | $629.00 | $7,548 |
That surcharge stacks with whatever cost-sharing model you chose above. A retiree at the $120,000 income tier pays $3,108/year in Part B premium regardless of whether they're on Medicare Advantage or Original Medicare + Medigap — the IRMAA bracket doesn't care about your plan choice, only your income. We've broken down the IRMAA cliff and the IRA's $2,000 Part D cap in more detail, but the short version for this post: model your IRMAA bracket first, then layer the plan-choice math on top of it. Skipping that step is how people underestimate their real annual Medicare bill by $1,000–$5,000.
The part that's irreversible: your Medigap window closes the day you get sick
Here's where the public-health-cuts context actually changes the calculus, not just the headline. If you're on Medicare Advantage today and you're healthy, switching to Medigap Plan G later sounds simple. It isn't, in most states. Outside your initial Medigap Open Enrollment Period (the six months after you first enroll in Part B at 65) or a handful of guaranteed-issue triggers, insurers can medically underwrite you — meaning a necrotizing fasciitis diagnosis, a Vibrio infection, or even a screwworm-related wound infection this year could get your Medigap application denied or priced with a health surcharge next year, in the 41 states that allow medical underwriting.
That's the real cost of waiting. The window to lock in guaranteed-issue Medigap coverage is before the health event, not after — which is exactly the opposite of when most people start paying attention. The Medicare Rights Center's recent policy work on private plan information gaps makes a similar point: beneficiaries consistently report not having clear, personalized information about their coverage until they're already deep into a claim dispute. By then, the Medigap door in most states has already closed.
If you're on Medicare Advantage and considering a switch, the annual MA Open Enrollment window (January 1–March 31) and the broader Fall Open Enrollment period are the only regular chances to move — and moving to Medigap successfully depends on your state's underwriting rules and your current health status. You can model your specific state's guaranteed-issue rules and current Medigap Plan G rate at Toravine before you assume the option will still be there when you need it.
Your zip code and income change the answer
This isn't a one-size-fits-all comparison, and that's the point. Our census_acs_medicare dataset — 6,287 county-level records — shows enormous variation in both Medicare beneficiary income and the availability of specialty care within MA networks. Rural counties with fewer in-network infectious disease and wound care specialists push more beneficiaries toward the out-of-network MOOP tier in our hospitalization example above, while urban counties with dense MA provider networks keep more care in-network at the lower cap.
Income matters just as much. Beneficiaries near the Medicare Savings Program thresholds — a topic getting renewed attention as Medicaid and SNAP cuts become a live affordability issue in states like Nevada, where healthcare costs are shaping the 2026 governor's race — may qualify for help with Part B premiums and cost-sharing that changes this whole comparison. We've covered MSP eligibility gaps in detail, and it's worth checking before you assume you're locked into full-price premiums on either path.
The 10-year version of this math
Run the comparison out a decade instead of one hospitalization, assuming our $120,000-income beneficiary above, two hospitalization events over ten years, and routine annual cost-sharing of about $1,500 in the other eight years:
| Original Medicare + Plan G | Medicare Advantage | |
|---|---|---|
| Part B premium (10 yrs) | $31,080 | $31,080 |
| Plan premium (10 yrs) | $21,360 ($178/mo Plan G) | $0–$4,200 |
| Hospitalization cost-sharing (2 events) | ~$0 | $17,700–$26,000 |
| Routine annual cost-sharing (8 yrs) | ~$2,056 (Part B deductibles) | $12,000 |
| 10-year total | ~$54,500 | ~$61,000–$73,000 |
The gap narrows fast for a healthier beneficiary who avoids hospitalization entirely — Medicare Advantage's $0 premium can win comfortably in a low-utilization year, a comparison we've run in detail for a $59,000 hospital stay under both plan types. The point isn't that one plan wins universally — it's that your risk profile this year, not last year's plan comparison chart, should drive the decision.
What to check before you assume your plan still fits
Run three numbers before your next enrollment window: your IRMAA bracket based on your two-years-prior tax return, your MA plan's actual in-network and out-of-network MOOP (not the CMS ceiling — your plan's real number), and your state's Medigap guaranteed-issue rules if you're considering a switch. None of these numbers stay static year to year, and none of them are things you should be estimating from a national average when your zip code and income determine the real answer.
You can model all three for your specific situation — income, county, current plan, and health status — at Toravine, and see exactly what a serious hospitalization would cost you under your actual plan before you're the one deciding whether to appeal a prior authorization denial from a hospital bed.
Sources
- New Disease Threats Follow Trump Administration’s Health Program Cuts — KFF Medicare
- Affordable Healthcare Emerges as a Voter Priority in Purple Nevada — KFF Medicare
- Priority Issues Across Medicare, Part 2: Private Plans and Information Needs — Medicare Rights Center
- Fewer health information exchanges say they experience info blocking — Healthcare Dive
- A Mom Said Infant Formula Killed Her Baby. The Manufacturer Closed the File. — KFF Medicare