Days in AR Explained
“Days in AR” is one of the most quoted RCM metrics — and one of the most frequently misunderstood, because a “good” number depends heavily on specialty, payer mix, and how the metric is even calculated. Here’s what it actually measures, current benchmarks, and what to do if your number is higher than it should be.
What Days in AR Actually Measures
Days in AR (Accounts Receivable) measures the average number of days it takes your practice to collect payment after a service is rendered. In simple terms: it answers the question “how long is our money sitting uncollected?”
The basic formula: Days in AR = Total Accounts Receivable ÷ Average Daily Charges
For example, if your practice has $150,000 in outstanding AR and averages $5,000 in daily charges, your Days in AR is 30 — meaning it takes roughly a month, on average, to collect on billed services.
What’s a Good Benchmark?
Under 40 days: Generally considered healthy for most specialties, indicating an efficient claims and collections process.
40–50 days: A caution zone — not a crisis, but worth investigating which payers or claim types are driving the number up.
Over 50 days: Typically signals a process issue somewhere in the cycle — whether that’s claim submission delays, high denial rates requiring rework, or slow follow-up on aging claims.
These ranges are general industry guidance, not hard rules. A practice with a high percentage of self-pay patients, or one that primarily bills slower-paying payers, may have a structurally higher Days in AR even with an efficient internal process.
Why Days in AR Rises (The Real Causes)
High denial rates. Every denied claim that requires rework adds days before that money is collected — sometimes weeks or months, depending on appeal timelines.
Slow claim submission. If claims sit before being submitted (batching delays, missing documentation, credentialing gaps), the clock starts later than it should.
Inconsistent AR follow-up. Claims that age past 60 or 90 days without active follow-up become progressively harder to collect — both because staff attention shifts to newer claims, and because payer timely-filing windows for corrections start closing.
Payer mix. Government payers and certain commercial payers have inherently different payment cycles; a practice’s payer mix directly affects what a “normal” Days in AR looks like for that specific practice.
How to Bring Days in AR Down
Segment by aging bucket, not just the average
A single Days in AR number can hide a serious problem — for example, if 80% of your AR collects in 20 days but 20% is stuck past 120 days, your average might look fine while a meaningful chunk of revenue is genuinely at risk.
Prioritize follow-up by dollar value and age
Not all aging claims deserve equal attention. A structured approach — working the highest-dollar aging claims first, and setting a hard follow-up cadence (e.g., every 15 days for anything past 30 days) — prevents claims from silently aging into unrecoverable territory.
Address the denial rate directly
Since denials are one of the biggest drivers of AR aging, reducing your denial rate has a compounding effect on Days in AR — fewer claims need rework, so more of your AR collects on the first pass.
Automate eligibility and authorization checks upfront
Many aging claims trace back to preventable front-end issues. Fixing eligibility verification and authorization checks before the claim is even submitted reduces the number of claims that end up stuck in the aging bucket in the first place.
Benchmark Your Own Numbers
Generic benchmarks are a starting point, but the real value comes from knowing exactly where your practice stands — and which specific metric (denial rate, clean claim rate, or follow-up cadence) is driving your Days in AR number.
Run your actual figures through the RCM KPI Health Check to see your Days in AR alongside Clean Claim Rate, Net Collection Rate, and Denial Rate — all benchmarked together, free and instant.