Definition
Days in AR measures how long revenue waits between service and collection: total accounts receivable ÷ average daily charges (typically gross charges over the trailing 90 days ÷ 90). A result of 42 means the average dollar of billed revenue sits uncollected for 42 days.
Why It Matters
Every day in the number is working capital the practice finances itself — money earned but not banked. Beyond cash flow, the metric is the best single-glance indicator of cycle speed: submission lag, rework cycles, follow-up gaps, and patient-balance aging all add days, so a rising number says something upstream is slowing without saying what.
Benchmarks
Commonly cited: under 35–40 days indicates a well-run cycle for many office-based specialties. Structure moves the realistic target — procedure-heavy specialties with authorization cycles, workers’ comp exposure, or heavy out-of-network volume run structurally higher. Your own trend on a fixed formula beats the league table.
The Decomposition That Makes It Useful
The headline number hides its causes. Split it into segments, each with an owner:
- Service to charge entry — documentation and entry lag (target: 1–2 days)
- Charge to submission — batch habits and edit queues (target: same day)
- Submission to payer response — payer processing plus your pend-response speed
- Rework cycles — days added per rejected or denied claim
- Patient-balance aging — statement timing and collection discipline
- Dead weight — uncollectible old AR inflating the numerator
Practices that decompose usually discover their “slow payers” contribute fewer excess days than their own lag and follow-up gaps.
How to Reduce It
Compress the controllable segments first: daily charge entry and submission remove structural days from every claim. Then attack rework (clean claim rate) and silence (status sweeps at 25–30 days). Then patient aging: estimates, time-of-service collection, and reliable statement cycles. Finally, purge documented-dead AR so the metric measures live receivables.
Common Errors
- Formula drift: switching between gross and net charges, or changing the averaging window
- Letting write-off timing manufacture fake improvements
- Reading insurance and patient AR as one blended number when they behave differently
- Comparing against benchmarks from different specialties or payer mixes
Practical Checklist
- One formula, documented, computed monthly
- Segment decomposition at least quarterly
- Insurance and patient AR read separately
- Dead AR triaged out with documentation
- Trend reviewed with explanations, not just values
Frequently Asked Questions
Our days in AR is 55 — is that a crisis? It is a signal to decompose, not to panic. A 55 built on comp-heavy or authorization-heavy billing may be structural; a 55 in routine office billing usually contains a week of controllable lag and a follow-up gap. The segments tell you which — and the segments are fixable individually.
Can days in AR be too low? Aggressive write-off habits can polish the number while quietly abandoning collectible claims — a low days-in-AR with a weak net collection rate is exactly that pattern. Always read the two metrics together.