Most practices track their collection rate. It shows up in monthly reports, it gets cited in performance reviews, and it tends to look reassuringly high — 95%, 97%, sometimes even higher. So when cash flow feels tight or the bank account does not reflect what the practice is billing, people are confused. The collection rate looks fine. What is the problem?
The problem is that collection rate is a lagging number. It tells you what percentage of collectible revenue you eventually brought in — but it does not tell you how long it took, or how much revenue is still sitting in the pipeline waiting to be collected. A practice can have a 96% collection rate and still have a serious cash flow problem if it is taking 75 days to collect what it is owed.
AR days — the average number of days it takes your practice to collect payment after a service is rendered — is the number that tells the real story.
What AR Days Actually Measures
AR days (also called Days in Accounts Receivable or DAR) measures the average time between when a service is provided and when it is paid. The formula is simple: divide your total outstanding AR by your average daily charges.
A lower number means you are collecting faster. A higher number means money is sitting in the pipeline longer — tied up in unpaid claims, unworked denials, slow payer processing, or patient balances that are not being followed up on.
Industry benchmark: AR days below 30 is strong. Between 30 and 40 is acceptable. Above 40 is a signal that something in your revenue cycle needs attention. Above 50 is a problem.
The benchmark varies slightly by specialty and payer mix — a practice with a heavy Medicaid volume will naturally run higher than one that is predominantly commercial. But the direction of the trend matters as much as the number itself. AR days creeping up month over month is always worth investigating, regardless of where it starts.
Why Collection Rate Can Hide the Problem
Here is a scenario that plays out in practices more often than most billing managers would like to admit.
A claim gets denied. The denial sits for three weeks before someone works it. It gets resubmitted, eventually gets paid, and the payment gets counted toward the collection rate. The rate stays high. The practice looks like it is performing well.
But that claim took 60 days to collect instead of 20. The cash that should have been in the bank in February arrived in April. Multiply that across hundreds of claims and you have a cash flow problem that the collection rate will never surface.
AR days catches this. It measures time, not just outcome. And in a medical practice where payroll, rent, and vendor payments do not pause while you wait for claims to process, time is money in the most literal sense.
3 Root Causes of High AR Days
When AR days is elevated, the cause is almost always one of three things — or a combination of all three.
1. Denials That Are Not Being Worked Promptly
Every day a denied claim sits unworked is a day it adds to your AR days. Practices without a structured denial management process — where someone owns each denial, works it within a defined timeframe, and tracks resolution — will almost always run high AR days as a result. Denials are not just a revenue problem; they are a timing problem.
2. No Systematic AR Follow-Up Process
Claims that are submitted and not followed up on age into the 60, 90, and 120-day buckets. Some payers are slow. Some claims require additional information. Some just need a phone call to move through the queue. Without a systematic follow-up process — where aging claims are worked in priority order, every week, without exception — AR days climbs steadily.
3. Patient Balances Left Unaddressed
With high-deductible health plans now the norm, patient responsibility is a larger portion of practice revenue than it was five years ago. Practices that do not have a clear, consistent process for collecting patient balances — whether at the time of service, through statements, or through follow-up calls — will see those balances aging in the AR and driving up their days.
What to Do If Your AR Days Are Too High
The good news is that high AR days is a fixable problem. It is not a sign that something is fundamentally broken — it is a sign that specific processes need to be tightened. Here is where to start:
- Pull your AR aging report and segment it by payer and by age bucket. Identify which payers and which age buckets are driving the bulk of your outstanding balance.
- Set a follow-up schedule. Every claim over 30 days with no payment or response should be in an active follow-up queue. Every claim over 60 days should be prioritized.
- Look at your denial rate alongside your AR days. If both are elevated, denials are likely the primary driver. If AR days is high but denial rate is low, the issue is more likely slow payer processing or patient balance follow-up.
- Set a target. For most practices, getting AR days below 35 is a realistic and achievable goal within 60 to 90 days of focused effort.
The Number Worth Watching Every Month
Collection rate will always look better than it should. It is designed to. AR days will not flatter you — but it will tell you the truth about how your revenue cycle is actually performing.
If you have not pulled your AR days recently, pull it today. If it is above 40, something in your billing process needs attention. If it is above 50, it needs attention now.
The practices that manage their revenue cycle well are the ones that watch the right numbers — and AR days is one of the most important ones you can track.