The Break-Even Retention Test: The Only Math That Should Decide Whether You Drop a PPO

A practice collecting $1 million a year with a 35% average write-off is handing roughly $350,000 in billed fees to insurers before it pays a single hygienist, according to Veritas Dental Resources citing the ADA's 2023 Survey of Dental Fees, which puts PPO write-offs at 30% to 40% of billed fees. That number gets quoted in every consultant pitch deck in the country, and it is the single worst basis for deciding whether to drop a plan.

Here is the claim you can argue with: your write-off percentage is almost irrelevant to whether you should leave a PPO. A plan that discounts you 42% can be worth keeping and a plan that discounts you 24% can be worth firing, and the thing that decides it is not the discount at all. It is the share of those patients who would follow you out. That share has a number, it is computable from your own ledger in about forty minutes, and almost nobody computes it before making a six-figure decision.

Write-Off Percentage Measures Your Discount, Not Your Decision

Write-off percentage tells you how far your fee schedule sits below your UCR. It tells you nothing about whether the patients attached to that schedule are yours or the plan's. Those are different questions, and only the second one determines what happens to collections after you send the termination letter.

The reason owners conflate them is that the write-off number is easy to get and the retention number feels unknowable. So the decision defaults to gut: either "we can't afford to lose 40% of the schedule" or "we're giving away $350,000, we're out." Both are guesses dressed up as analysis. Our view: write-off percentage is the wrong metric, and the right one is a ratio nobody markets to you because there is no software to sell alongside it.

The Break-Even Retention Test, Defined

The Break-Even Retention Test answers one question: what percentage of a plan's patients must you keep for collections to stay flat after you leave?

The formula is short. Break-even retention equals net collections per visit under the plan divided by net collections per visit out of network. If you realistically keep more than that share, leaving wins. If you realistically keep less, stay and renegotiate.

Both inputs come from your practice management software, not from a benchmark report. Net collections per visit under the plan is what you actually banked from that payer last year divided by the visits that produced it. Net collections per visit out of network is your full fee for the same mix of procedures, discounted for the courtesy adjustments and bad debt you will genuinely absorb from patients paying you directly. Not your wish list. What you will actually collect.

The test applies to any decision that trades patient volume for price: dropping a PPO, renegotiating one, going fully fee-for-service, raising your fee schedule, or launching a membership plan to catch the uninsured. Every one of those decisions is the same shape. You give up some patients to earn more per patient. The only question is where the line sits.

Plan C Needs 68% of Its Patients to Stay

Run it on a real shape of practice. Plan C sends you 1,600 visits a year at an average billed fee of $420 per visit, so you bill $672,000 against that plan.

At a 35% write-off you collect $436,800 of it.

Net collections per visit under the plan is $436,800 divided by 1,600 visits, or $273.

Out of network you bill the same $420 and, after a realistic 5% haircut for courtesy adjustments, prompt-pay discounts and accounts that never clear, you net $399 per visit.

Break-even retention is $273 divided by $399, or 68.4%.

That is the whole test. Keep more than roughly seven in ten of Plan C's patients and you are ahead on day one. Keep fewer and you are behind. Note what disappeared from the math: the 35% write-off never shows up as a verdict, only as an input. A 42% write-off would push break-even retention down to about 61%, which makes the worse plan easier to leave, not harder.

Now price the outcomes. At 80% retention you keep 1,280 visits, collect $510,720, and gain $73,920 against the old number.

At 55% retention you keep 880 visits, collect $351,120, and lose $85,680.

A $160,000 swing sits between those two scenarios, and the entire difference is retention. Not the discount. Not the fee schedule. Retention.

The 68% Question Already Has an Answer

The obvious objection is that retention is unknowable until you try. It is not unknowable. It is estimable, and there is published experience to estimate against.

A practice that documented its own exit in Dental Economics budgeted for losing up to 30% of its PPO patients and retained well more than that, with the majority staying on as fee-for-service. The more useful number in that account is the second one: only 6% to 7% of patients said they originally found the practice through insurance. That is the tell. If insurance is how most of your patients found you, you are a listing, and the plan owns the relationship. If insurance is how they pay once they already chose you, you are a practice, and you own it.

You can pull your own version of that 6% figure. New patient intake forms ask how people found you. Count the last 300. If "my insurance website" is under 10%, your realistic retention is comfortably north of a 68% break-even and we'd drop the plan. If it is over 30%, you are the plan's distribution channel and you should stay and renegotiate from a position you can actually defend.

What Most Owners Get Wrong: Ranking Plans by Discount

The specific mistake, and it is made most often by owners with three to eight years of ownership who have just hired their first consultant, is building a spreadsheet that ranks every payer by write-off percentage and then dropping whichever one sits at the bottom.

That ranking is wrong twice over. It ignores retention, which we have covered. It also ignores which hours each plan consumes. A plan with a brutal 40% write-off that fills Tuesday and Thursday mornings you would otherwise sit empty is contributing real money. A plan with a tolerable 27% write-off that occupies every prime restorative block is costing you the crown-and-bridge cases you turn away. The discount column cannot see the difference.

The second mistake is running the test once and treating the answer as permanent. Break-even retention moves every time your fee schedule moves, every time a payer reprices, and every time your cost base shifts. Equipment and supply prices are up 5% since the start of 2025 while provider reimbursement rates grow more slowly than inflation, per the ADA Health Policy Institute's Q4 2025 State of the U.S. Dental Economy report. Out of network you can reprice against that. Inside a PPO contract you cannot, which is precisely why a plan that cleared break-even in 2023 may not clear it now.

Collections per Provider Hour Is the Tiebreaker

When the Break-Even Retention Test comes back close to the line, and it often does, the tiebreaker is Collections per Provider Hour: net collections divided by the provider chair hours that produced them, computed separately for each payer.

Say Plan C's 1,600 visits consume 780 provider hours. Under the plan that is $436,800 across 780 hours, or $560 an hour.

At 80% retention out of network you keep 624 of those hours and collect $510,720, which is $818 an hour.

That gap is where the decision actually lives. The Bureau of Labor Statistics puts the median annual wage for dentists at $176,110 as of May 2025, which across roughly 1,600 clinical hours prices your own time at about $110 an hour before a dollar of overhead.

Carry 65% overhead and a $560 chair hour leaves $196 before doctor comp, so $86 in actual profit.

An $818 chair hour leaves $286 before doctor comp, so $176.

Flat collections on fewer visits is not a wash. It is the same money earned in less time with less supply and lab cost attached, which means the true break-even sits slightly below whatever the test returns. The test is conservative by design, and that is a feature.

Where the Break-Even Retention Test Breaks

Four conditions break it, and you should check all four before acting.

• Empty chairs. One-third of dentists now report they are not busy enough, up from one-quarter in Q4 2024, per the ADA Health Policy Institute. If you have open capacity, the hours you free by losing patients are worth nothing, and the test overstates your upside. If you are booked six weeks out, the freed hours backfill at full fee and the test understates it badly.
• Non-average leavers. The test assumes the patients who leave look like the ones who stay. They rarely do. Lose the recall-only patients and you win. Lose the three families carrying your implant and ortho cases and the arithmetic inverts.
• Employer concentration. If one local employer accounts for 200 of a plan's patients, exit is not a distribution of individual decisions. It is one decision made in an HR meeting you are not invited to.
• Timeline. Attrition appears over 18 to 24 months as patients cycle through recall, not in the first quarter. Anyone declaring victory at 90 days is measuring the wrong window.

Renegotiation Is the Other Half of the Answer

A test that returns "stay" is not a defeat. Insurance and reimbursement ranked as a top concern for more than half of dentists heading into 2026, and 37 dental insurance reform laws passed across 18 states in 2025, up from 16 laws in 9 states the year before, according to ADA News. The bargaining environment is moving in your direction for the first time in a decade.

Walking into a renegotiation knowing your break-even retention is 68% and your realistic retention is 85% is a completely different conversation than walking in with a grievance about write-offs. One is a credible threat with a number behind it. The other is noise the network rep has heard four hundred times. You are not deciding whether the discount is fair. You are deciding whether the patients are yours or the plan's, and that is a question you can answer before you ever pick up the phone.

Run Your Worst Plan Through the Test This Week

Pull last year's collections and visit count for your single largest PPO and divide to get net collections per visit under the plan. Price the same visit mix at your full fee, cut 5% for courtesy and bad debt, and divide the first number by the second to get your break-even retention. Then count how many of your last 300 new patients said they found you through insurance, because that is your retention estimate and the whole decision turns on it. If those two numbers are more than fifteen points apart in your favor, send the letter.

We are watching one variable that would change this call: whether the 2025 reform laws actually move contracted rates in 2026 or just add disclosure requirements. If rates move, break-even retention falls for everyone and fewer exits make sense. If they do not, the case for leaving gets stronger every quarter that supply costs outrun reimbursement.

If you want to see where your own plans land before you commit, our PPO-exit calculator runs the Break-Even Retention Test on your numbers and shows the collections swing at each retention level. It takes a few minutes and you get your break-even percentage per plan. Run your own numbers and find out which of your plans you are actually subsidizing.