Opting out of Medicare mid-career: the conversion rate that has to hold

What opting out changes when most of your panel is Medicare

Opting out replaces Medicare's fee schedule with prices you set, for every Medicare patient you treat, all at once. Federal law lets a clinician charge a Medicare beneficiary more than Medicare allows only after filing an opt-out affidavit and signing a written private contract with that patient 1Ref 1Office of the Law Revision Counsel, U.S. House of Representatives (1997).42 U.S.C. § 1395a — Free choice by patient guaranteed (subsection (b), Private contracts).The statutory gate: charging a Medicare beneficiary beyond Medicare's limits for a covered service requires the opt-out affidavit plus a written per-beneficiary private contract disclosing that no Medicare claim will be filed and that Medicare will not pay.. For a panel that is mostly Medicare, the change lands on most of your revenue on a single effective date.

Of the ways a clinician can stand toward the program, only a formal opt-out ends the price caps. A physician who has properly opted out is exempt from Medicare's limiting charge provisions 2Ref 2Centers for Medicare & Medicaid Services (2023).42 CFR § 405.425 — Effects of opting-out of Medicare.Only a physician who has formally opted out is exempt from the limiting-charge provisions; used to state what opting out changes relative to remaining enrolled., and under a private contract Medicare's limits no longer apply to what you may charge 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services..

Services furnished under a private contract are not covered services under Medicare, and no Medicare payment will be made for them, directly or indirectly, outside the narrow emergency and urgent-care carve-out below 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services.. The decision therefore rests on how many of your current Medicare patients will pay your price out of pocket.

One contract opts you out for everything

There is no per-patient version of this. Even one private contract with one Medicare beneficiary, plus the filed affidavit, opts you out of Medicare for the entire two-year period, for every Medicare patient you see 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services.. A hybrid tier, where a few Medicare patients pay privately while the rest stay on ordinary claims, is a design the regulation forecloses: the first signed contract, together with the filed affidavit, is the opt-out itself 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services..

The all-or-nothing shape is why this question gets asked the way it does. A practice with three Medicare patients can opt out and barely notice. A practice where Medicare is most of the book is putting most of the book on one filing.

Enrolled practices that want a membership layer sometimes charge a retainer fee without opting out. That is a different structure with rules of its own, and this page does not cover it; the charge limits on covered services come off only with a formal opt-out 2Ref 2Centers for Medicare & Medicaid Services (2023).42 CFR § 405.425 — Effects of opting-out of Medicare.Only a physician who has formally opted out is exempt from the limiting-charge provisions; used to state what opting out changes relative to remaining enrolled..

The conversion rate that has to hold

No source in this article's citation set measures how much of a Medicare panel converts to private pay after an opt-out, so the decision rests on a break-even you compute from your own books. The inputs are three: what you now collect per Medicare visit, the private fee you would charge for the same visit, and the share of current Medicare patients who would sign a contract at that fee. The third input is the one you control least.

Call your current collection per Medicare visit M, counting Medicare's payment and the patient's share together, and call the planned private fee P. Revenue from the Medicare slice of the panel holds when the share of visits that convert is at least M divided by P. Set the fee at 1.5 times current collections and two-thirds of those visits have to survive the switch. At double the fee, the threshold falls to half.

That is the friendly version of the test. Gross revenue can hold while the practice still starves, because the patients who leave take contribution toward the lease and the payroll with them, and those costs do not shrink on the same schedule. The stricter break-even asks what conversion rate keeps the practice above its fixed costs, and that version comes out of your own profit-and-loss, with your accountant in the room.

Some of the cost side does move with the revenue side, though not the fixed part. An opted-out slice of the panel generates no claims, no denials and no timely-filing calendar, and collection terms become yours to set. That relief has a value; whether to put it in the fee is your call. None of the cited sources measures retention itself: how much of a real panel stayed after a real practice opted out. Treat any confident number you hear as marketing.

You can measure your own before committing to anything. A sequence that keeps every option open:

1. Pull twelve months of Medicare collections and visit counts from your billing records and compute M, including the cost-sharing you already collect from patients. If the records are thin, your current allowed amounts are in CMS's Physician Fee Schedule look-up tool. 2. Set P from your costs and your market. The fee schedule you are leaving makes a poor anchor for the price you are moving to. 3. Compute M divided by P, then run the same arithmetic against fixed costs instead of gross revenue. 4. Put the conversion offer in front of the panel in writing, with the real fee on it, months ahead, and count the replies. That count is the closest thing to your conversion rate that exists. 5. Sign nothing yet. File the affidavit within 10 days after the first contract is signed and the two-year clock starts on the day the affidavit was signed; file later and it starts on the filing date instead 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services.. The signatures are the commitment, so they come last.

The calendar: the two-year term and the deadlines around it

The timing runs on five clocks, and most of them are deadlines that pass quietly. The opt-out runs an initial two-year term from the date the affidavit is signed, and it renews automatically for each successive two-year period unless you cancel 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services.. The undo windows are short: ninety days to terminate early, and thirty days before each term's end to stop the renewal 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice.. The ninety days run from the initial period's effective date 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice..

The ninety-day window deserves the circle on the calendar, and it is more than a notice. To terminate early you must notify every MAC you filed with inside the window, refund each privately contracted patient everything collected beyond Medicare's limiting charge (beyond the deductible and coinsurance, for practitioners who are not physicians), and tell each of those patients about the termination and their right to have claims filed 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice.. The exit is open only to a clinician who has not opted out before 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice.. Meet those conditions and reinstatement runs as if there had been no opt-out 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice.. The window exists only in the initial period; a renewed term has no early exit. Once a second term starts, the next door out is thirty days before it ends 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice..

For a participating physician the effective date is not freely chosen either. The opt-out lands only on a calendar-quarter boundary, with the affidavit in at least thirty days ahead 5Ref 5Centers for Medicare & Medicaid Services (2023).42 CFR § 405.410 — Conditions for properly opting-out of Medicare.The requirement to file a signed affidavit with each Medicare Administrative Contractor, and the participating-physician path: effect only at the start of a calendar quarter with the affidavit filed at least 30 days before., so the letter to the panel, the contract signatures and the final Medicare claims all schedule backward from that date.

Auto-renewal is what turns one decision into a default. Nothing needs to happen for the opt-out to continue; it renews every two years until someone sends the notice 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services.. A practice that opted out and moved on can find, years later, that its status was decided by silence.

The paperwork: one affidavit per MAC, one contract per patient

The affidavit goes to each Medicare Administrative Contractor whose jurisdiction covers where you treat Medicare patients, and if you treat them in more than one MAC jurisdiction, each contractor gets its own filing 5Ref 5Centers for Medicare & Medicaid Services (2023).42 CFR § 405.410 — Conditions for properly opting-out of Medicare.The requirement to file a signed affidavit with each Medicare Administrative Contractor, and the participating-physician path: effect only at the start of a calendar quarter with the affidavit filed at least 30 days before.. Among other things, it must identify you and promise that no Medicare claim will be submitted for any service furnished to a beneficiary during the opt-out period 6Ref 6Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).42 CFR § 405.420 — Requirements of the Affidavit.What the affidavit must contain, including the promise to submit no Medicare claim for any beneficiary service during the opt-out period and the acknowledgment that it binds all covered services furnished in that period..

The affidavit must also acknowledge that its terms bind every covered item and service you furnish in that time, and that a patient who needs emergency or urgent care may not be asked to sign a private contract 6Ref 6Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).42 CFR § 405.420 — Requirements of the Affidavit.What the affidavit must contain, including the promise to submit no Medicare claim for any beneficiary service during the opt-out period and the acknowledgment that it binds all covered services furnished in that period..

The private contract is signed with each Medicare patient, one by one, and it carries the disclosures that make the arrangement lawful. Among its required terms: that no claim will go to Medicare for the services it covers and Medicare will not pay for them 1Ref 1Office of the Law Revision Counsel, U.S. House of Representatives (1997).42 U.S.C. § 1395a — Free choice by patient guaranteed (subsection (b), Private contracts).The statutory gate: charging a Medicare beneficiary beyond Medicare's limits for a covered service requires the opt-out affidavit plus a written per-beneficiary private contract disclosing that no Medicare claim will be filed and that Medicare will not pay., that Medicare's charge limits do not apply to what you bill under it 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services., that Medigap plans do not pay toward the contracted services and other supplemental coverage may not either 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services., and the effective and expiration dates of the current two-year period 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services.. It cannot be entered into at a moment when the patient needs emergency or urgent care 3Ref 3Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (§405.400 Definitions, §405.405 General rules, §405.410 Conditions for properly opting-out, §405.415 Requirements of the private contract).The core mechanics: one signed private contract plus the filed affidavit opts the practitioner out for the whole 2-year period, the term renews automatically, the affidavit must be filed within 10 days of the first contract, Medicare's charge limits stop applying to private-contract fees, and no Medicare payment is made for contracted services.. Signed contracts are what your conversion rate is made of; each one is a patient who read those terms and stayed.

A patient who declines to sign is still inside the affidavit's promise. No claim can be submitted for anything you furnish any beneficiary during the period 6Ref 6Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).42 CFR § 405.420 — Requirements of the Affidavit.What the affidavit must contain, including the promise to submit no Medicare claim for any beneficiary service during the opt-out period and the acknowledgment that it binds all covered services furnished in that period., and outside the emergency and urgent-care lane there is no contract-free way for a visit to be paid through the program 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice..

What still runs through Medicare after you opt out

An opted-out clinician does not need a private contract to furnish emergency or urgent care to a Medicare beneficiary they have not already contracted with, and may not enter into one with a patient who needs that care; the affidavit itself has to acknowledge as much 6Ref 6Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).42 CFR § 405.420 — Requirements of the Affidavit.What the affidavit must contain, including the promise to submit no Medicare claim for any beneficiary service during the opt-out period and the acknowledgment that it binds all covered services furnished in that period..

Medicare can still be billed for the care, and what you may collect is capped at Medicare's limits: a physician no more than the limiting charge, other practitioners no more than the deductible and coinsurance 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice.. Sized for exceptions and priced at Medicare's caps, the carve-out changes nothing in the break-even.

Deciding with the panel you have

A Medicare-heavy caseload makes the arithmetic heavier without changing its shape. The more of your revenue that runs through the program, the more a missed conversion rate takes with it. The workable sequence is price first, measure second, file last.

As of November 2024, about 1.2 percent of non-pediatric physicians had formally opted out of Medicare, with the highest concentration in psychiatry 7Ref 7KFF (2024).How Many Physicians Have Opted Out of the Medicare Program?.The framed benchmark that about 1.2 percent of non-pediatric physicians had formally opted out as of November 2024, concentrated in psychiatry; cited only for prevalence, never for retention or revenue.. The figure counts physicians only, leaves out nurse practitioners and physician assistants, and says nothing about how the practices that opted out fared afterward 7Ref 7KFF (2024).How Many Physicians Have Opted Out of the Medicare Program?.The framed benchmark that about 1.2 percent of non-pediatric physicians had formally opted out as of November 2024, concentrated in psychiatry; cited only for prevalence, never for retention or revenue.. Psychiatry runs far above that line: 8.1 percent of psychiatrists had opted out in 2024, against 4.5 percent in plastic and reconstructive surgery and 3.2 percent in neurology 7Ref 7KFF (2024).How Many Physicians Have Opted Out of the Medicare Program?.The framed benchmark that about 1.2 percent of non-pediatric physicians had formally opted out as of November 2024, concentrated in psychiatry; cited only for prevalence, never for retention or revenue..

The deciding input is not public: it is your own panel's reply to a real fee. Put the offer in writing and let the reply rate make the case.

The ninety-day deadline is the one to put on the calendar, because after it the decision can no longer be fully unwound 4Ref 4Centers for Medicare & Medicaid Services (CMS), Department of Health and Human Services (2024).Code of Federal Regulations, Title 42, Chapter IV, Subchapter B, Part 405, Subpart D — Private Contracts (tail of § 405.435, § 405.440 Emergency and urgent care services, § 405.445 Cancellation of opt-out and early termination of opt-out, start of § 405.450 Appeals).The emergency and urgent-care carve-out with its payment caps, the 90-day early-termination deadline measured from the initial period's effective date, and the 30-day non-renewal notice..