Dental A/R over 90 days: how to actually recover it
The over-90 bucket does not grow because your team is careless. It grows because working it always loses to whoever is standing at the front desk.
Every practice management system will produce an aging report. Far fewer practices can show one that shrank last month. The gap between those two things is not skill — it is protected hours.
Why it ages
- Rejections that never reached the payer and produced no EOB, so nothing prompted anyone to look.
- Denials that needed documentation nobody had time to assemble.
- Coordination-of-benefits loops where the secondary is waiting on the primary.
- Claims sent to the wrong payer or the wrong plan after a patient changed jobs.
- Balances that are genuinely the patient's but were never communicated as such.
What is still recoverable
Timely-filing limits are the hard boundary, commonly running from 90 days to a year from date of service depending on payer and contract. Past the limit, an appeal generally needs documented proof of timely original submission — which is precisely what practices with a stalled backlog usually cannot produce.
A working order that shrinks the bucket
- Sort by age and value together. The largest balances nearest their filing deadline get worked first — that is where recoverable money is disappearing fastest.
- Assign a cause to every balance before working it. Without a reason code you are re-diagnosing the same problem repeatedly.
- Batch by cause, not by date. Twenty claims denied for the same missing attachment are one task, not twenty.
- Fix upstream. If one payer denies for the same reason every month, the fix belongs in submission, not in follow-up.
- Report movement weekly. A bucket that has not moved in three weeks is telling you something.
Why in-house teams rarely clear it
Aged A/R competes for the same hours as current claims, and current claims always win because they are urgent. The backlog is important but never urgent, which is the textbook condition for work that never gets done. Clearing it needs either dedicated protected time or a separate desk — the mechanism matters less than the separation.
Questions
What is a healthy dental A/R over 90 days?
Benchmarks vary by payer mix and practice type, and a single universal figure would be misleading. The more useful measure is direction: is the bucket shrinking month over month? A high but falling balance is a healthier signal than a moderate, static one.
Should we write off old A/R?
Anything genuinely past appeal should be written off so your reporting is honest. Carrying uncollectable balances makes the practice look like it has assets it does not.
Can outsourcing help?
It helps for a structural reason rather than a skill one: an outside desk has protected hours that an in-office team does not. If you can genuinely ring-fence the time internally, that works too.