Medicare Advantage $90 ER Copay vs Medigap Plan G $0 Coinsurance: What the No Surprises Act Doesn't Cover on a $6,700 Emergency Bill in 2026
You're on vacation two states away from home. Chest tightness sends you to the nearest ER. Three hours, a cardiac workup, and one overnight observation stay later, the bill lands: $6,700. Before you even open the envelope, one question determines almost everything about what you'll actually owe: which Medicare coverage are you carrying, and have you met your deductible yet this year?
That's not a rhetorical question. Based on Toravine's analysis of 11,267 data points across our census ACS Medicare, CMS plan premium, Medigap rate, and IRMAA datasets, the same $6,700 emergency visit can cost a beneficiary anywhere from $90 to over $1,500 — and the gap has almost nothing to do with the hospital and almost everything to do with the paperwork you filled out during your last enrollment window.
Why the No Surprises Act doesn't help you here
Healthcare Dive recently covered research on the No Surprises Act (NSA), the 2022 federal law that bans out-of-network providers from balance-billing privately insured patients for emergency care. HaloMD, a firm that helps providers navigate NSA billing, claims the law has cut at least $1 billion in out-of-network emergency spending. Independent researchers aren't so sure the savings are showing up where patients would feel them — the dispute is mostly about whether insurers or providers are capturing the difference, not patients.
Here's the detail that matters for you: the No Surprises Act was written for the commercial insurance market. Original Medicare and Medicare Advantage were never inside its scope, because Medicare already had its own — and in some ways stricter — anti-balance-billing framework decades before the NSA existed:
- Under Original Medicare, providers who accept Medicare assignment cannot bill you more than the Medicare-approved amount, full stop. Non-participating providers can charge up to 15% over that amount (the "limiting charge"), but nothing beyond it.
- Under federal Medicare Advantage rules (42 CFR 422.113), MA plans must cover emergency services at the same cost-sharing level regardless of network status. An out-of-network ER visit is billed to you exactly like an in-network one.
So the good news is that a Medicare beneficiary is structurally insulated from the exact "surprise bill" scenario the NSA targets. The bad news — and the part almost nobody explains clearly — is that being protected from balance billing is not the same as being protected from cost-sharing. Your deductible, coinsurance, or copay still applies in full. And that's precisely where the four Medicare coverage paths diverge on a $6,700 bill.
The $6,700 ER bill, four ways
| Coverage | What you pay on this bill | Annual premium cost | Unlimited exposure risk? |
|---|---|---|---|
| Original Medicare only | $257 Part B deductible + 20% of remaining $6,443 = $1,545.60 | $185/month ($2,220/yr) | Yes — no out-of-pocket cap |
| Original Medicare + Medigap Plan G | $257 Part B deductible, then $0 | $2,220 (Part B) + ~$2,280 (Plan G, $190/mo national average) = $4,500/yr | No — Plan G caps coinsurance |
| Medicare Advantage HMO, ER only | Flat $90 ER copay (Toravine's CMS plan premium dataset average across 1,236 plan filings) | $16/month average premium ($192/yr) | Capped at plan MOOP ($8,850 average) |
| Medicare Advantage HMO, admitted overnight | $90 ER copay + ~$295/day inpatient copay (1 night) = $385 | Same $192/yr | Capped at MOOP |
This is the kind of analysis Toravine runs for you — so you don't have to build the spreadsheet yourself for every possible ER scenario.
Notice what actually drives the outcome: it isn't the hospital's bill, and it isn't whether the ER was "in-network." It's whether you're carrying a Medigap policy, whether you've already burned through your Part B deductible this year, and what your specific MA plan sets as its ER copay — which, per our CMS plan premium dataset, ranges from $50 to $130 depending on the carrier and county. A plan with a $50 ER copay in one county might be a $125 copay for the identical benefit design one state over. If you compared plans during last fall's enrollment window based on premium alone, you may not have looked at this number at all.
The catch Medicare Advantage doesn't advertise
The $90 flat copay looks like the obvious winner in the table above — and for a single ER visit with no admission, it usually is. But two things change the math:
First, post-stabilization care requires authorization. Once you're stable, if the ER wants to admit you or transfer you to a specialist facility, your MA plan can require prior authorization for what happens next. We've covered this dynamic in detail in Medicare Advantage vs Medigap Plan G for a $6,700 ER Bill — the emergency visit itself is protected, but everything downstream of "you're stable now" is where MA plans regain leverage over cost and care decisions that Original Medicare simply doesn't have.
Second, the flat copay is a bargain only until you have a bad year. If you're hospitalized twice, need a specialty drug regimen, and see three out-of-network specialists during a referral cascade, that $90 copay repeats every visit, and your MA plan's Maximum Out-of-Pocket limit — averaging $8,850 across the plans in our dataset — becomes the real ceiling. Compare that to Plan G, where once you've paid the single $257 Part B deductible for the year, essentially everything else is $0 regardless of how many ER visits or hospitalizations follow. For beneficiaries managing chronic conditions, that structural difference compounds every single year you're enrolled.
You can model this for your specific situation — your actual county's MA copay structure, your Medigap quote, your expected utilization — at Toravine.
The premium side nobody separates from the ER bill
The ER bill is one line item. Your premiums run all year, and they're shaped by decisions that have nothing to do with your health status.
If your income pushes you into an IRMAA bracket — our CMS IRMAA dataset shows the first tier starting above roughly $106,000 for single filers in 2026 — your Part B premium jumps from $185/month to $259/month, an extra $888 a year, applied regardless of which coverage path you choose. We walked through how ordinary CD interest can trigger this in IRMAA and CD Interest in 2026. If you're near a threshold, that surcharge often costs more over a decade than the ER bill you're worried about.
Medigap premiums also aren't fixed. Our medigap_rates dataset — 3,570 rows spanning carriers and states — shows Plan G running from $178 to $221/month depending on where you live and when you enrolled, a spread we detailed in Medigap Plan G Premiums Up 15% in 2026. And this is where the irreversible part of the decision lives: once you're past your Medigap open enrollment window (the six months after you turn 65 and enroll in Part B), insurers in most states can medically underwrite you. If you picked Medicare Advantage at 65 and want to switch to Plan G at 72 after a cancer diagnosis, you may be denied outright or charged a rate that erases every dollar you saved on premiums in the meantime.
Why this isn't just a spreadsheet problem — it's a ballot-box one
KFF Health News' recent reporting on California's 22nd Congressional District found healthcare affordability sitting at the top of voter concerns heading into the midterms, with both the incumbent and his challenger facing pressure to explain what they'd actually do about it. That's not a coincidence specific to one district — it reflects what happens when out-of-pocket exposure varies this dramatically based on paperwork decisions most people made years earlier and never revisited. The fact that a $6,700 bill can cost $90 or $1,545 depending on a form you filled out at 65 is, functionally, a policy design question, not just a personal budgeting one.
It's also a uniquely American problem. The Commonwealth Fund's country profiles on systems like Taiwan's National Health Insurance and France's statutory health insurance show a structurally different approach: flat, predictable, nationally standardized cost-sharing for emergency care, with far less variation by carrier, plan tier, or county. Indonesia's JKN program, still building toward universal coverage, is explicitly designed around avoiding the kind of plan-by-plan cost-sharing maze that U.S. Medicare beneficiaries navigate every October. None of those systems ask a 68-year-old to compare 40 plan documents to figure out what a broken arm will cost — the fact that Medicare does is a direct consequence of how the American system layers private plan choice on top of a public program.
What to actually check before your next ER visit
You don't need to memorize IRMAA brackets or NSA case law. You need three numbers, specific to you:
- Your plan's exact ER copay and MOOP — not the marketing brochure's "$0 premium" headline, but the cost-sharing schedule buried in the Evidence of Coverage.
- Whether you've met your Part B deductible this year — it resets every January 1, and an ER visit in February hits differently than one in November.
- Whether you're within a protected enrollment window if you're even considering switching from Medicare Advantage to Medigap, since underwriting can lock in your current choice for life.
Run your own numbers — your zip code's MA copay ranges, your income bracket's IRMAA exposure, and your Medigap quote — at Toravine before your next enrollment period closes the door on a decision you'll be living with for years.
Sources
- HaloMD says No Surprises is lowering spending on emergency care. Researchers aren’t convinced. — Healthcare Dive
- In Toss-Up House District, Voters Crave Leadership To Fix Broken Healthcare — KFF Medicare
- Indonesia — Commonwealth Fund
- Taiwan — Commonwealth Fund
- France — Commonwealth Fund