PPO Write-Off Percentage: When Is It Too High?

Your write-off percentage is the share of your fee schedule you give away to stay in network. Most PPO-heavy practices run 20-35%. Past 40%, you're working Fridays for the insurance company.

How to calculate it

Pull gross production at your full fee schedule and total contractual adjustments for the same period. Write-off percentage = adjustments divided by gross production. Run it for the trailing 12 months, not one month, because plan mix shifts seasonally.

A practice producing $1.2M gross with $420K in PPO adjustments is writing off 35%. That's $420K of dentistry performed and never collected.

The thresholds that matter

Under 25%: healthy for a PPO practice. You're likely in a few well-paying networks and out of the worst ones.

25-35%: normal but worth a per-carrier audit. Usually two or three plans are doing most of the damage.

Over 40%: a red flag in valuations and the point where dropping your worst plan often nets more than growing production. Buyers model your collections, and a 45% write-off rate caps what they'll pay.

Audit by carrier, not in aggregate

The blended number hides the problem. Rank each PPO by write-off percentage and by share of your active patients. The plan to act on is the one with a high write-off rate and a small patient base, because the downside of leaving is limited.

Start with your top 10 CPT codes per carrier. We walk through that math in how to calculate your real PPO reimbursement rate.

The fix is renegotiate, then drop

Request a fee review with your worst carrier first; 5-10% bumps on your top codes are common if you've been in network 3+ years. If they won't move, model the exit. You typically keep 55-65% of those patients, and the math on that is in what happens to collections when you drop a PPO.

State-specific rules change the play. California operators, see the 2026 California PPO exit strategy.