Total A/R can look healthy while the tail rots. The share sitting over 90 days predicts write-offs months before they appear, because claims that age past 90 days rarely recover on their own and frequently run into filing deadlines.
Days in A/R is an average, and averages hide tails. A practice can hold a respectable average while a growing share of its receivable quietly becomes uncollectable.
Why the 90-day bucket is different
Collectability falls sharply with age. A claim at 30 days is mostly a question of processing. A claim at 120 days has usually failed at something — denied and unworked, rejected and unnoticed, or sitting behind a coverage problem nobody resolved.
And the bucket is close to filing and appeal limits. Some of what sits there is already unrecoverable; it just has not been written off yet, so it still counts as an asset.
The number that leads your write-offs
This is the practical value: aged A/R predicts write-offs one to two quarters ahead. If the over-90 share is climbing, you are watching future write-offs accumulate in real time. By the time they appear as write-offs, the decision was made months earlier by inaction.
How to read it
- As a percentage of total A/R, not a dollar figure — the dollar figure grows with the practice and tells you less.
- Segmented by payer. Aged workers compensation is normal. Aged commercial is a problem.
- Split insurance from patient. They age for different reasons and need different work.
- Beside the filing deadline, which is the only thing that makes an aged claim urgent rather than merely old.
If you look at one number monthly, look at days in A/R. If you look at two, make the second one this.
Segment before you panic
Workers compensation, auto liability and some Medicaid managed care plans age slowly as a matter of course. A blended over-90 figure that includes them tells you about your payer mix rather than your process.
Split the bucket by payer and the actionable portion usually turns out to be smaller and more specific than the headline suggested.
Name the unrecoverable portion
Claims past filing, past appeal, or behind coverage that never existed are not receivable. Leaving them in inflates an asset and makes the ratio permanently alarming for a reason nobody can fix.
Writing them off does not lose money that was ever coming; it makes the remaining number honest and the queue workable.
Watch it monthly, act on the trend
A single month reflects one large claim or one slow payer. Three months of a rising share is a process telling you something, usually that denials are being generated faster than they are being worked.
Common questions
- What is a good percentage of A/R over 90 days?
- Lower is better and the benchmark varies by payer mix, but the trend matters more than the number. A rising share predicts write-offs regardless of where it starts.
- Why is the 90-day bucket more important than total A/R?
- Total A/R moves with volume. The over-90 share measures whether claims are resolving, which is what actually determines whether the money arrives.
- Does A/R over 90 days always mean a problem?
- Not always — some payers are structurally slow and workers compensation ages by nature. Segment by payer before concluding the process is failing.
- How do I reduce aged A/R?
- Work the queue by recoverability rather than age, fix the denial causes creating it, and write off what is genuinely unrecoverable so the real number is visible.
- Should credit balances be excluded from the calculation?
- Yes. Credit balances net against outstanding claims and make the ratio look better than it is, which is why they belong in their own report.
Denials Piling Up?
We handle the revenue cycle end to end — coding by certified coders, claim submission, denial management and appeals, and A/R follow-up, with six reported numbers every month.