Prior authorization infographic showing a denied Medicare healthcare request, delays and paperwork on one side, approved care on the other, and the importance of understanding and appealing coverage decisions.

Prior Authorization: What It Is and Why It Matters

Prior authorization means your insurance plan has to approve certain treatments, procedures, or prescriptions before you receive them — not after. It’s one of the most-criticized features of modern health insurance, and also one of the most defended. Understanding both sides, and what’s genuinely changing in 2026, matters more than ever.

Does This Actually Affect You Right Now?

Before diving into the details, here’s the honest, quick answer — because most of what follows involves big policy changes that don’t apply to everyone equally:

  • On Medicare Advantage? Yes, prior authorization has always been part of your plan, for at least some services. This isn’t new for you, though the rules around speed and transparency just got meaningfully better in 2026.
  • On Original Medicare, outside Arizona, New Jersey, Ohio, Oklahoma, Texas, or Washington? No — prior authorization still essentially doesn’t apply to you. The rest of the country hasn’t seen this change yet.
  • On Original Medicare, inside one of those six states? Possibly — but only for 17 specific outpatient procedures (things like spinal injections and nerve stimulator implants), not your everyday care.
  • On Medicaid or an ACA Marketplace plan? Yes, and like Medicare Advantage, you should now see faster decisions and a specific reason for any denial.

If none of those apply to you directly today, this is still worth understanding — Medicare rules have a way of expanding once a pilot program proves itself, and this is genuinely one of the more consequential shifts happening in Medicare policy this year.

Why Insurers Actually Use It

: Infographic explaining why Medicare plans use prior authorization, including confirming medical necessity, preventing fraud and waste, controlling healthcare costs, and verifying coverage before treatment.
  1. Stopping fraud at the source. For decades, Medicare largely ran on a “pay-and-chase” model — bills got paid automatically, and fraud investigators tried to claw the money back years later, after criminal billing rings had already made off with it. Prior authorization flips that: it requires proof a service is legitimate before payment happens, not after.
  2. Confirming medical necessity. Clinical practice varies a lot from doctor to doctor. If someone has mild knee pain, standard guidelines call for physical therapy first — not jumping straight to surgery. Prior authorization is meant to be a checkpoint that asks a doctor to justify skipping the conservative, lower-risk step.
  3. Steering toward cost-effective alternatives. If a doctor prescribes an expensive brand-name drug when an identical generic exists, prior authorization forces an explanation of why the cheaper option won’t work for that specific patient.

In theory, this also protects you directly: an approval given before a procedure is a form of written confirmation that your plan will pay — reducing the risk of a surprise bill months later for a service the insurer later decides wasn’t “medically necessary.”

The Real Cost to Patients

None of that erases the genuine, well-documented downside.

  • Delays that matter medically. Even a standard multi-day wait can allow a condition to worsen while a decision is pending.
  • A serious administrative burden. Prior authorization is consistently cited by physicians as their single biggest paperwork headache — enough that many practices now employ staff whose entire job is managing these requests.
  • Treatment abandonment. Faced with a prolonged approval process, a meaningful share of patients simply give up on a recommended treatment or prescription entirely, rather than fight the process.

How Often Are Requests Actually Denied?

This is where things get concrete. In August 2026, KFF published the first public analysis of insurer-reported prior authorization data, covering Medicare Advantage, Medicaid managed care, and ACA Marketplace plans.

Infographic explaining why Medicare plans use prior authorization, including confirming medical necessity, preventing fraud and waste, controlling healthcare costs, and verifying coverage before treatment.

Two things stand out. First, denial rates vary enormously by insurer, not just by market — among Medicare Advantage carriers alone, standard denial rates ranged from 5% (Elevance) to 17% (UnitedHealth Group). Second, and more important for you personally: appeals win far more often than most people expect — 67% of Medicare Advantage denials were overturned when appealed. The catch is that most denials are never appealed at all.

Paul’s Honest Take: That 67% overturn number is the single most important statistic in this whole article. If you or a family member gets a prior authorization denial, don’t treat it as final. The data says you have better-than-even odds of winning if you actually push back — most people just don’t.

The Big 2026 Shift: Faster Deadlines (CMS-0057-F)

A federal rule called CMS-0057-F, finalized in 2024 and operationally effective January 1, 2026, put real teeth into how fast insurers have to respond.

  • 72 hours for urgent/expedited requests
  • 7 calendar days for standard requests (down from a common 14-day window)
  • A specific clinical reason required for every denial — no more generic rejections
  • Public reporting of approval and denial metrics, posted on each payer’s own website

Important scope note: this rule applies to Medicare Advantage, Medicaid, CHIP, and ACA Marketplace plans — it does not apply to Original Medicare, and it does not apply to prescription drug prior authorizations (a separate proposed rule, still pending, would extend similar timelines to pharmacy benefits). CMS estimates this rule alone saves roughly $15 billion system-wide over ten years, mostly through reduced administrative waste.

The Landmark Change: Prior Authorization Comes to Original Medicare

For decades, prior authorization was framed almost entirely as a Medicare Advantage problem — Original Medicare let you see any doctor and get treatment with essentially no administrative gatekeeping. That changed in 2026.

WISeR Model infographic explaining the 2026 Original Medicare prior authorization pilot, including where it applies, the types of services affected, and the current status of the program.

The WISeR Model (Wasteful and Inappropriate Service Reduction) is a CMS Innovation Center pilot that introduces prior authorization — or prepayment review — to traditional Medicare for the first time, in six states, for 17 specific outpatient procedures including epidural steroid injections, spinal fusion, implanted nerve stimulators, and skin substitutes. It launched January 1, 2026 and is scheduled to run through the end of 2031.

The AI element: CMS contracts with private technology vendors that use AI and machine learning to help evaluate requests, working alongside human clinical reviewers. CMS has stated human clinicians retain final say on denials, and providers can request a second clinical opinion.

Where things genuinely stand, as of August 2026 — and this is more contested than most coverage suggests:

  • A Senate vote to overturn WISeR failed, 46–50, on July 16, 2026 — meaning the pilot continues as planned, at least for now.
  • A House Appropriations Committee amendment to block WISeR’s funding passed committee by voice vote in June 2026 — but this is one step in a long process. It still needs to pass the full House and Senate as part of a broader spending bill before it becomes binding, and a similar effort last year didn’t make it into final legislation.
  • The Electronic Frontier Foundation filed a federal lawsuit in March 2026 under the Freedom of Information Act, seeking disclosure of the AI vendors’ contracts, testing data, and performance audits — CMS has not released this information, and the case remains active.

Paul’s Honest Take: I want to be straight with you about this one: WISeR is real, it’s active right now in six states, and it is not currently dead or defunded, despite plenty of headlines that could leave you with that impression. If you’re in Arizona, New Jersey, Ohio, Oklahoma, Texas, or Washington and on traditional Medicare, this is genuinely worth understanding — not because it’s been decisively stopped, but because it hasn’t been.

What This Actually Looks Like for a Patient

To make this concrete, here’s what these processes tend to look like in practice — illustrative scenarios based on the kinds of situations patient advocates and reporters have documented, not specific individuals:

The documentation trap. Someone with years of routine, successful treatment for chronic pain — say, a regular epidural injection — suddenly has that same treatment flagged for prior authorization under a program like WISeR. The request is denied on a technicality: the chart doesn’t contain a specific phrase about how the pain limits daily activities, even though the clinical need is identical to every prior visit. The fix requires an entirely separate appointment just to add that phrase to the record — a real delay for a paperwork issue, not a medical one.

The algorithm disagreement. A patient recovering from a serious event like a stroke is recommended for several weeks of intensive inpatient rehabilitation. An AI-assisted review estimates a shorter stay based on regional averages and initially denies the longer request, pointing the family toward cheaper, lower-intensity care instead. An appeal — often requiring real persistence from family members or a patient advocate — can succeed, but the process itself can eat into a genuinely time-sensitive recovery window.

The step therapy carousel. A patient is prescribed a specific, effective but expensive medication. Instead of approving it directly, the insurer requires “step therapy” — trying and failing on cheaper alternatives first, even when a doctor believes those alternatives are unlikely to work. Months can pass, with real side effects along the way, before the originally-prescribed medication is finally approved.

These scenarios are common enough patterns that patient advocacy organizations and investigative journalists have documented versions of each repeatedly — they’re illustrative of a real, recurring dynamic, not isolated incidents.

How to Protect Yourself

If you or a family member run into a prior authorization hurdle, patient advocates consistently recommend the same handful of steps:

  1. Request the specific denial reason in writing. Under CMS-0057-F, insurers covered by the rule are legally required to give a plain-language clinical explanation, not a generic rejection. Get a copy.
  2. Ask your doctor to request an expedited review if a standard wait could genuinely harm you. Insurers covered by the rule must respond to urgent requests within 72 hours.
  3. Use a peer-to-peer review. If a claim is denied, your doctor’s office can request a direct phone conversation with a clinician employed by the insurer — this can resolve a dispute in a single call rather than weeks of written appeals.
  4. Actually appeal. Given that Medicare Advantage denials are overturned 67% of the time on appeal, and most people never appeal at all, this single step may be the highest-value thing you can do if you believe a denial was wrong.

Frequently Asked Questions

Does prior authorization apply to Original Medicare everywhere now? No — outside the six WISeR pilot states (Arizona, New Jersey, Ohio, Oklahoma, Texas, Washington) and the 17 specific procedures covered, Original Medicare still does not require prior authorization for most care.

If I live in a WISeR state, does this affect all my care? No — only the 17 specific outpatient procedures on CMS’s list are affected. Routine doctor visits, most hospital care, and the vast majority of Medicare-covered services are unaffected.

Is the WISeR pilot the same as Medicare Advantage prior authorization? No — they’re separate systems. Medicare Advantage plans have long used their own prior authorization rules, covering thousands of services. WISeR is new, narrower in scope, and specific to Original Medicare in six states.

If my request is denied, is that the final answer? Not necessarily, and often not in practice — Medicare Advantage denials are overturned on appeal 67% of the time, though most denials are never appealed at all.

Does the new 72-hour/7-day rule apply to my Part D drug prior authorizations? No — CMS-0057-F specifically excludes prescription drug prior authorizations. A separate rule addressing pharmacy benefit timelines has been proposed but is not yet finalized.

The Bottom Line

Prior authorization is a genuine trade-off, not a pure villain or a pure safeguard. It closes real gaps — fraud, unnecessary procedures, runaway costs — while creating real friction and, sometimes, real delays in care that matters. What’s changing in 2026 cuts both ways: faster legal deadlines and mandatory denial explanations for Medicare Advantage, Medicaid, and ACA plans, alongside prior authorization’s first-ever expansion into Original Medicare through the WISeR pilot — a program that remains legally and politically contested as this is written.

If there’s one thing worth remembering above everything else in this article, it’s this: a denial is not the end of the story. Two-thirds of Medicare Advantage denials get overturned when someone actually appeals — and most people never do. If it happens to you or someone you love, don’t let the paperwork win by default.

Related Reading

Sources:

This article reflects the current status of Medicare and federal prior authorization rules as of August 2026, which is an actively evolving legal and political situation. If you’re facing a prior authorization denial and aren’t sure what to do next, call us at 631-358-5793. No pressure, no cost.



What Is Medicare Part B and What Does It Actually Cover?

The complete guide to Medicare’s medical insurance — every service it covers, exactly what it costs in 2026, how it works with group insurance and VA benefits, and the excess charges most people have never heard of until they get a surprise bill.

The Short Answer

Medicare Part B is medical insurance — it covers doctor visits, outpatient care, preventive services, durable medical equipment, and more. Unlike Part A, Part B is not premium-free for anyone: everyone pays a monthly premium (202.90in2026formostpeople),anannualdeductible(283), and 20% coinsurance on most covered services, with no yearly cap on that 20% under Original Medicare alone. Whether you need to enroll at 65, and whether delaying is safe, depends heavily on your employment status and your employer’s size — getting this wrong is one of the most consequential and permanent mistakes in all of Medicare.

Key Takeaways

  • Part B is never premium-free — everyone pays a monthly premium, and higher earners pay significantly more through IRMAA.
  • The 20% coinsurance under Original Medicare alone has no yearly cap — this is the single biggest financial risk in Medicare, and it’s the reason Medigap and Medicare Advantage exist.
  • Whether you can safely delay Part B without a penalty depends on your employer’s size: 20+ employees generally allows delay; fewer than 20 generally does not.
  • Missing your enrollment window triggers a permanent 10% penalty for every 12-month period you went without coverage.
  • Veterans can and generally should enroll in Part B even with VA benefits, since Medicare and VA coverage don’t coordinate — each only pays for care received within its own system.
  • “Excess charges” from non-participating providers can add up to 15% on top of what Medicare approves, and only some Medigap plans protect you from them.

What Part B Actually Covers

While Part A handles hospital room and board, Part B is the half of Original Medicare that covers medical care and most services delivered outside a hospital admission — doctor visits, outpatient procedures, and ongoing medical needs.

What’s covered

  • Doctor visits — primary care and specialists
  • Outpatient surgeries and procedures
  • Diagnostic lab work, X-rays, and MRIs
  • Emergency room visits
  • Ambulance services
  • Outpatient mental health care
  • Physical, occupational, and speech therapy
  • Chemotherapy and radiation received in an outpatient clinic
  • Durable Medical Equipment (DME) — wheelchairs, oxygen equipment, blood sugar monitors, walkers, and similar equipment
  • Ambulatory surgical center services

Preventive services: the part Medicare gets genuinely right

Most preventive services are covered at 100%, with no deductible and no copay, as long as your provider accepts Medicare assignment. This includes:

  • Your one-time “Welcome to Medicare” wellness visit, available within your first 12 months on Part B
  • Annual wellness visits after that
  • Flu shots and most other recommended vaccines
  • Mammograms
  • Colonoscopies and other cancer screenings
  • Diabetes and cardiovascular screenings
  • Many other screenings recommended by the U.S. Preventive Services Task Force

Paul’s Honest Take: This is one of the most underused parts of Medicare, full stop. I’ve had clients who paid for a private physical every year out of habit and never realized their annual wellness visit through Medicare was completely free. If you haven’t used your Welcome to Medicare visit or your annual wellness visit, that’s real value sitting on the table.

What’s NOT covered

  • Routine dental care — cleanings, fillings, dentures, extractions
  • Routine vision exams and eyeglasses
  • Hearing aids (though diagnostic hearing tests ordered by a doctor may be covered)
  • Long-term custodial nursing home care — help with daily living activities, as opposed to short-term skilled or medical care
  • Routine prescription drugs you pick up at a retail pharmacy — that’s Part D’s job, not Part B’s
  • Cosmetic surgery, unless medically necessary (such as reconstruction after an accident or mastectomy)
  • Most care received outside the United States, with very limited exceptions
  • Routine foot care, such as nail trimming, in the absence of a qualifying medical condition
  • Acupuncture, except for a narrow, specific chronic low back pain benefit
  • Concierge medicine fees and membership-style charges some practices add on top of standard care
  • Long-term care insurance-style services, including most home-based personal care that isn’t tied to a skilled medical need

Paul’s Honest Take: The dental and vision exclusions are the ones that surprise people most, especially since they’re such routine parts of healthcare for most adults. This is exactly why so many Medicare Advantage plans build dental, vision, and hearing benefits into their coverage — Original Medicare was simply never designed to include them, and that gap doesn’t go away on its own.

What Part B Costs in 2026

Part B has three separate cost components, and understanding all three matters:

Cost Component

2026 Amount

Standard monthly premium

$202.90

Annual deductible

$283

Coinsurance on most covered services

20%

The premium is deducted automatically from your Social Security check if you’re already collecting benefits. If you’re not yet collecting Social Security, you’ll receive a bill, typically every three months.

The deductible works differently than Part A’s — it’s a straightforward annual figure. You pay the first $283 of Medicare-approved outpatient costs each calendar year, and then Medicare’s cost-sharing kicks in.

The coinsurance is where the real risk lives. After your deductible is met, Medicare pays 80% of the Medicare-approved amount for most covered services, and you’re responsible for the remaining 20%. There is no yearly cap on this 20% under Original Medicare alone. If you have a $100,000 course of cancer treatment, your 20% share is $20,000 — unless you have a Medigap policy or Medicare Advantage plan absorbing that cost.

Paul’s Honest Take: I put this in bold because it’s genuinely the single most important number in this entire guide. That uncapped 20% is the whole reason Medigap and Medicare Advantage exist as products in the first place. Original Medicare by itself was never designed to protect you from a truly expensive year — it was designed to cover 80% of it and leave the rest to you.

IRMAA: What Higher Earners Actually Pay

If your income is above certain thresholds, you’ll pay more for Part B through the Income-Related Monthly Adjustment Amount (IRMAA) — based on your tax return from two years prior. For 2026, that means your 2024 income determines your premium tier.

2024 Income (Individual)

2024 Income (Married, Joint)

Total Part B / Month

$109,000 or less

$218,000 or less

$202.90

$109,001 – $137,000

$218,001 – $274,000

$284.10

$137,001 – $171,000

$274,001 – $342,000

$405.80

$171,001 – $205,000

$342,001 – $410,000

$527.50

$205,001 – $499,999

$410,001 – $749,999

$649.20

$500,000 and above

$750,000 and above

$689.90

At the top tier, you’re paying more than three times the standard premium. If your income has recently dropped — retirement, the loss of a spouse, or certain other life-changing events — you can appeal your IRMAA determination using Form SSA-44.

Do You Have to Enroll? And What Happens If You Don’t?

Technically, Part B is optional — Medicare won’t force you into it. But opting out without a valid alternative is genuinely risky, because of how the penalty structure works.

If you don’t sign up during your Initial Enrollment Period (the 7-month window around your 65th birthday) and you don’t have qualifying employer coverage, you’ll face a permanent 10% penalty added to your premium for every full 12-month period you went without Part B. That penalty doesn’t expire — you pay it for as long as you have Part B, which for most people means for the rest of your life.

Example: If you delayed enrollment by 24 full months without a valid exception, you’d pay an extra 20% on top of the standard $202.90 premium in 2026 — roughly $40.58 more, every month, permanently.

How Part B Works with Group Insurance

Just like Part A, whether you can safely delay Part B without penalty comes down to one specific number: how many employees your company has.

Companies with 20 or more employees: If you or your spouse are actively working and covered by a genuine group health plan, your workplace insurance is primary, and you can legally delay Part B without any penalty. When that employment or coverage eventually ends, you get an 8-month Special Enrollment Period to enroll in Part B penalty-free.

Companies with fewer than 20 employees: Medicare automatically becomes your primary insurer at 65, regardless of your employment status. You need to enroll in Part B right on schedule. If you don’t, your small employer’s plan can legally refuse to pay claims that Medicare should have covered first — potentially leaving you responsible for the full cost.

Paul’s Honest Take: I say this in nearly every guide I write, because it’s genuinely one of the costliest misunderstandings I encounter: “I have good coverage at work” and “I’m protected from Medicare’s enrollment deadlines” are two completely different statements, and whether the second one is true depends entirely on your employer’s size — not how generous the coverage feels. Confirm the actual employee count before you decide to delay anything.

Retiree Coverage Is Not the Same as Active Employer Coverage

This is a distinction that catches a genuinely large number of people off guard: the “20 or more employees” exception only applies to active employment. If you retire and your former employer offers you retiree health benefits — sometimes a genuinely good, comprehensive plan — that coverage does not create a Special Enrollment Period the way active group coverage does, and it does not exempt you from enrolling in Part B on time.

Paul’s Honest Take: I’ve seen this mistake more than once, and it’s an especially painful one because it happens to people who did everything right during their working years. Someone retires with a strong retiree health plan from a large employer, assumes it works the same way their active coverage did, and delays Part B — only to find out later that retiree coverage was never a valid reason to delay in the first place. The moment you stop actively working, that clock starts, regardless of how good your retiree plan looks on paper. If you’re retiring and keeping employer retiree benefits, treat enrolling in Part B as something to handle right on schedule, not something retiree coverage lets you postpone.

Why You Need Both Part A and Part B for Medigap or Medicare Advantage

Here’s a foundational requirement worth understanding clearly, since it shapes every other coverage decision in Medicare: you must be enrolled in both Part A and Part B before you can buy a Medigap policy or enroll in a Medicare Advantage plan. Neither product exists as a standalone substitute for Original Medicare — both are built specifically to work alongside it.

  • Medigap fills the cost-sharing gaps left by Original Medicare (Parts A and B) — it has nothing to fill in if you’re not enrolled in both parts to begin with.
  • Medicare Advantage legally must provide at least the same coverage as Parts A and B combined, which is only possible because you’re required to be enrolled in both before a Medicare Advantage carrier can enroll you.

Paul’s Honest Take: This surprises people who assume they can somehow “skip” Part B and go straight into a Medicare Advantage plan to avoid the extra premium. It doesn’t work that way — Part B enrollment, and its premium, is a prerequisite either way, whether you end up on Original Medicare with Medigap or on a Medicare Advantage plan. There’s no path through Medicare that avoids the Part B premium once you’re actually using the system.

Does Medicare Work If You’re a Veteran?

Yes — and if you have VA health benefits, understanding how the two systems relate is genuinely important, because they work differently than most people assume.

Medicare and VA benefits do not coordinate. These are two entirely separate systems that each pay only for care received within their own network. Medicare doesn’t pay for care you receive at a VA facility, and VA benefits don’t pay for care you receive from a non-VA doctor or hospital. You, the veteran, choose which system to use each time you seek care.

Here’s the critical point: having VA benefits does not exempt you from Medicare’s enrollment deadlines. VA coverage is not considered a qualifying reason to delay Part B without penalty. If you don’t enroll in Part B during your Initial Enrollment Period and you’re relying solely on VA benefits, you can still trigger the permanent late enrollment penalty.

Why the VA itself recommends enrolling in Medicare anyway:

  • It gives you access to civilian doctors and hospitals outside the VA system
  • VA healthcare funding depends on annual Congressional appropriations, which isn’t guaranteed to remain stable
  • If VA authorizes only part of your needed care at a non-VA facility, Medicare can help cover the rest
  • Having both gives you meaningfully more flexibility and security than relying on either system alone

Paul’s Honest Take: This is one of the most common misconceptions I run into with veterans specifically, and it’s an expensive one to get wrong. Good VA coverage feels like it should be enough, and it might genuinely handle most of your care — but it doesn’t protect you from the Part B enrollment clock the way employer coverage from a large company can. The VA itself actively encourages enrolling in Medicare Parts A and B for exactly this reason. If you have VA benefits and are approaching 65, this is worth a direct conversation before you assume you’re covered.

Veterans who enroll in Part B can also purchase a Medigap policy, which can be particularly valuable if you use non-VA providers regularly — though if you primarily rely on VA facilities for most of your care, the value of an added Medigap policy may be more limited, and worth weighing carefully.

How Long Does It Actually Take to Get Part B Approved?

This is one of the most practical, and most overlooked, pieces of planning — especially if you’re leaving a job after 65 and coordinating your Part B start date around the end of your employer coverage. Applying isn’t instant, and the timeline depends heavily on which enrollment window you’re using.

Enrollment Situation

Typical Processing Time

When Coverage Actually Starts

Initial Enrollment Period (around 65)

2–4 weeks, sometimes up to 6

1st of your birthday month (if applied in the 3 months before) or 1st of the month after you apply (if applied during or after your birthday month)

Special Enrollment Period (leaving employer coverage)

4–8 weeks, sometimes longer

1st of the month after your application is submitted

General Enrollment Period (Jan 1–Mar 31, missed window)

4–6 weeks

1st of the month after you apply

Why the Special Enrollment Period takes longer: applying after leaving employer coverage requires two forms, not one — Form CMS-40B (the actual Part B application) and Form CMS-L564 (Request for Employment Information), which your employer needs to complete to verify you had qualifying coverage. Social Security has to manually review both, which is exactly why this route consistently takes longer than a standard Initial Enrollment Period application.

Paul’s Honest Take: This timeline question comes up constantly with clients who are retiring or leaving a job after 65, and it deserves real attention — not just because of the penalty risk we’ve already covered, but because a slow approval can leave you with an actual gap in coverage if you time it too tightly. My standard advice: start this process at least 2 to 3 months before you need Part B to actually begin, not the week your employer coverage ends. If your former employer is slow to complete their portion of Form CMS-L564, that alone can hold up the entire application — so it’s worth following up with your HR or benefits department directly rather than assuming it’s been submitted.

Practical tips to avoid delays

  • Apply online through SSA.gov whenever possible. It’s consistently the fastest method — mailed or faxed forms are more prone to getting lost or delayed.
  • If you’re on a Special Enrollment Period, submit Form CMS-L564 alongside Form CMS-40B, not separately. They need to arrive together, and one incomplete form can stall the whole application.
  • Expect a short intake lag even with online applications. It can take several business days for an online submission to actually appear on a local Social Security agent’s screen — don’t panic if you call shortly after applying and they say they don’t see it yet.
  • Once approved, you don’t have to wait for your physical card. Your Medicare Beneficiary Identifier typically appears in your online Social Security or Medicare.gov account within a day or two of approval, and you can print a temporary card from there — the physical card generally arrives by mail within about 30 days.

Excess Charges: The Cost Almost Nobody Knows to Ask About

Here’s a detail that surprises even people who’ve been on Medicare for years: not every doctor who accepts Medicare agrees to accept Medicare’s approved amount as full payment.

Providers fall into three categories:

  • Participating providers accept Medicare assignment, meaning they agree to accept the Medicare-approved amount as payment in full. This covers the vast majority of providers — roughly 98% of doctors nationally.
  • Non-participating providers still accept Medicare patients but haven’t agreed to accept the standard rate. They can charge an excess charge of up to 15% above the Medicare-approved amount.
  • Opted-out providers have left the Medicare system entirely and can charge whatever they want under a private contract — Medicare pays nothing at all for care from these providers, except in emergencies.

How excess charges actually work: if the Medicare-approved amount for a service is $300 and you see a non-participating provider, they can legally charge up to an additional $45 (15%) on top, for a total bill of $345 — and that excess amount doesn’t count toward your Part B deductible.

Eight states currently prohibit or limit excess charges entirely: Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island, and Vermont. If you live in one of these states, you’re generally shielded from excess charges from providers within your state — though you could still face them if you receive care from a non-participating provider elsewhere.

Paul’s Honest Take: This is exactly why Medigap Plan G matters so much for people who want maximum flexibility. Plan G covers excess charges in full — Plan N does not. If you’re the kind of person who wants the freedom to see any doctor without worrying about billing surprises, that distinction is worth understanding clearly before you pick between the two. And regardless of which plan you choose, it’s always worth asking a new provider directly whether they accept Medicare assignment before your first appointment.

The HSA Rule: Part B Closes the Door Too

If you’re hoping to keep contributing to a Health Savings Account, know this clearly: enrolling in Part B — or any part of Medicare — ends your ability to make new HSA contributions. This isn’t unique to Part B; it applies the moment you enroll in Medicare in any form, including premium-free Part A.

If keeping your HSA active matters to you, the only way to legally delay both Part A and Part B is through qualifying employer coverage — which, as covered above, generally requires an employer with 20 or more employees. And because Part A enrollment can be backdated up to 6 months once you do enroll, it’s smart to stop HSA contributions 6 months before you plan to sign up for Medicare or file for Social Security, whichever comes first.

Frequently Asked Questions

Is there a cap on what I’ll pay for Part B services in a year? Not under Original Medicare alone — the 20% coinsurance has no yearly limit. A Medigap policy or Medicare Advantage plan is what actually caps your exposure.

What happens if I don’t sign up for Part B on time? You’ll generally face a permanent 10% penalty on your premium for every 12-month period you went without coverage, unless you qualify for a Special Enrollment Period through active employer coverage.

Do I need Part B if I have good coverage through a small employer? Almost certainly yes. If your employer has fewer than 20 employees, Medicare becomes your primary insurer at 65 regardless of your job coverage, and not enrolling can leave you exposed to unpaid claims and a lifelong penalty.

Do veterans need Medicare Part B if they have VA benefits? Generally, yes. Medicare and VA benefits don’t coordinate — each only pays for care within its own system — and VA coverage doesn’t exempt you from Medicare’s enrollment deadlines or penalties.

What is a Part B excess charge? An additional charge, up to 15% above the Medicare-approved amount, that a non-participating provider can legally bill you. It doesn’t count toward your deductible, and only Medigap Plan G (among current plans) covers it in full.

Can I keep contributing to my HSA if I enroll in Part B? No. Enrolling in any part of Medicare, including Part B, ends your HSA contribution eligibility going forward.

How long does it take to get approved for Part B? It depends on the enrollment window. Initial Enrollment Period applications typically process in 2–4 weeks. Special Enrollment Period applications, used when leaving employer coverage, generally take 4–8 weeks since Social Security must manually verify your prior coverage using Form CMS-L564. Start the process at least 2–3 months before you need coverage to begin, especially when coordinating around a job ending.

The Bottom Line

Part B is the half of Medicare that covers your everyday medical care — and it’s also where the real financial exposure of Original Medicare lives, thanks to that uncapped 20% coinsurance. Whether you should enroll at 65, whether you can safely delay, and how much of that exposure you’re carrying all depend on details specific to your situation: your employer’s size, your income, your VA status, and which doctors you actually see.

If you want help sorting out exactly how Part B applies to your specific circumstances — or want to understand how Medigap or Medicare Advantage could close that uncapped coinsurance gap — that’s exactly the conversation I have with clients every day, at no cost to you.

Call 631-358-5793 or visit paulbinsurance.com to set up a time to talk it through.

Paul Barrett, CMIP, is the founder of The Modern Medicare Agency, based in Melville, NY, and has spent 18+ years exclusively helping people navigate Medicare — never life insurance, never annuities, just Medicare. He’s licensed in 37 states, represents more than 40 carriers, and has personally helped over 5,000 clients choose coverage that actually fits their lives.

Figures current as of 2026 and sourced from CMS, Medicare.gov, and the Social Security Administration. Individual circumstances vary, especially around employer coverage, VA benefits, and income-based premiums — always verify your specific situation before making enrollment decisions.

Sources

Related Post

Scroll to Top

Request a Callback with
Paul Barrett

Fill out the form below, and we'll call you within 24 hours.