Days in AR measures the average number of days it takes your practice to collect payment after a service is rendered. It’s the single clearest indicator of whether your revenue cycle is healthy, because it turns the abstract question of “are we getting paid fast enough?” into one number you can track month over month. A rising days-in-AR number is almost always the first sign of a billing problem, showing up in the data weeks before it shows up in your bank balance.
The number matters more than the raw dollar figure sitting in your accounts receivable, because a growing practice naturally carries more receivables than a shrinking one. Days in AR corrects for that by expressing your receivables relative to how fast you’re billing, which makes it comparable across time and against other practices. When it climbs, money that should be funding payroll and operations is stuck in the billing pipeline instead.
This post explains how to calculate days in AR, what a healthy number looks like, why it drifts upward, and the specific levers that bring it back down.
How to Calculate Days in AR
The formula is straightforward: total accounts receivable divided by average daily charges. Average daily charges is your total charges over a chosen period divided by the number of days in that period.
Most practices use a trailing 90-day window for the charge calculation, because it smooths out month-to-month volume swings and seasonality. HFMA publishes this formula as the standard methodology in its MAP Keys revenue cycle definitions, and MGMA uses the same formula for its Cost and Revenue Survey benchmarks, so calculating it this way keeps you comparable to the published benchmarks.
Here’s a worked example. A practice posts $900,000 in charges over the trailing 90 days, which works out to $10,000 in average daily charges. If the current total accounts receivable balance is $350,000, then days in AR is $350,000 divided by $10,000, or 35 days.
A couple of accuracy notes. Don’t count claims that were denied and rebilled as brand-new charges, and don’t double-count a resubmitted claim. Those small errors distort the whole calculation and send you chasing the wrong problem. And decide upfront whether you’re including patient-responsibility balances, because a practice with heavy self-pay balances will run higher and you want to compare like with like over time.
What’s a Healthy Days in AR?
The commonly cited healthy range is 30 to 40 days, with top-performing practices holding under 35. MGMA’s Cost and Revenue Survey places the median physician practice at 47 days, with better-performing practices at 36, and HFMA targets 30 to 40 days as healthy. Anything consistently past 50 days points to a specific breakdown you can find and fix.
A few important caveats on the benchmarks. Treat them as ranges, not a pass-fail line. A surgical practice carrying heavy prior authorization requirements will run differently from primary care. A payer mix weighted toward Medicare and Medicaid runs slower than one weighted toward commercial insurers, because government payers typically pay slower. Your own six-month trend tells you more than any single comparison against a national median.
There’s also a second number to watch alongside the headline figure: the percentage of your AR sitting over 90 days. A practice can have an acceptable average while a growing block of aged claims quietly turns uncollectible. MGMA benchmarking suggests keeping AR over 90 days under roughly 13 to 15% of total AR. Once a claim ages past 120 days, the odds of full collection drop sharply, and that bucket is where revenue goes to die.
Why Days in AR Drifts Upward
A rising days-in-AR number is a symptom, and there are a handful of usual causes. Identifying which one is driving your increase is the whole game, because each has a different fix.
Rising denials. This is the most common cause. When claims deny, they don’t get paid on the first pass, they age while your team reworks them, and the delay pushes the average up. Denial rates have been climbing industry-wide, so this is worth checking first.
Slow charge entry. The clock on days in AR starts when the service is rendered, not when you submit the claim. If there’s a lag between the visit and charge submission, every day of that lag adds directly to your number. A practice submitting charges 10 days after the visit is starting 10 days in the hole.
Aged claims nobody’s working. Claims in the 60-plus day buckets that aren’t being actively followed up drift toward the 90 and 120-day buckets, where collection odds collapse. Unworked aged AR is both a symptom and a cause.
A single slow payer. Sometimes the overall number looks bad because one payer is dragging the whole average up. Breaking days in AR down by payer often reveals that the problem is concentrated, not systemic.
Credentialing and enrollment gaps. This is the one most billing teams miss. When a provider isn’t fully credentialed or enrolled with a payer, their claims deny and sit in AR until the enrollment issue is resolved, which can take months. Those denials don’t clear when credentialing finishes, they require rework and resubmission. This is exactly the kind of gap our guide to the cost of credentialing delays breaks down, and it quietly inflates AR in ways a billing-only review won’t catch.
Not sure which one is driving your AR?
The audit breaks your days in AR down by cause and payer, so you stop guessing and see exactly where the money is stuck:
How to Bring Days in AR Down
The good news about days in AR is that it responds faster than most practice owners expect. Because it’s a function of how fast you’re billing and collecting, tightening a few specific points in the process moves the number within a quarter. Here are the levers that work, roughly in order of impact.
Shorten charge-to-submission lag. Reducing the gap between service and claim submission takes days off the metric directly. Getting charges out in 3 to 4 days instead of 10 removes several days from your number with no other change.
Work denials fast. Denials worked within 14 days of receipt recover more dollars from the 31-to-60-day bucket and prevent claims from migrating into the 90-plus bucket where they become write-offs. A defined denial-management process is the highest-leverage fix for most practices with elevated AR.
Lift your clean claim rate. Every claim that goes out clean is a claim that doesn’t come back for rework. Raising clean claim rate from 90% to 95% removes rework cycles that otherwise add days to the average. Clean claims are the upstream fix that prevents AR problems before they start.
Work aged AR systematically. Put a standing cadence on the 60, 90, and 120-day buckets so aged claims get worked before they become uncollectible. This is unglamorous cleanup, but it’s where recoverable dollars are actively slipping away.
Fix the credentialing gaps feeding denials. If a share of your denials traces back to enrollment problems, no amount of billing rework fixes the root cause. The provider has to be correctly credentialed and enrolled for those claims to pay. Reconciling enrollment across payers stops the denials at the source.
A practice starting at 55 days can typically reach the low 40s within a quarter and the high 30s within two quarters. Reaching the top-performer range of under 35 usually takes six to nine months of sustained discipline on aged AR and clean-claim work.
When a Rising Number Signals Something Bigger
Days in AR is a diagnostic, not just a scorecard. A steadily climbing number that resists the usual fixes often points to a structural problem rather than a workflow one. If you’ve tightened charge entry, worked denials, and cleaned up aged AR, and the number still won’t come down, the issue is usually upstream: enrollment gaps, a payer contract problem, or a billing operation that’s under-resourced for the volume.
At that point, the question shifts from “how do we work AR faster?” to “is our billing operation set up correctly?” A practice consistently running above 50 days despite active effort is often better served by outsourcing billing to a team with the capacity and denial-management discipline to hold the number down, rather than continuing to patch a process that keeps drifting.
Frequently Asked Questions
The healthy range is 30 to 40 days, with top-performing practices holding under 35. MGMA data places the median physician practice at 47 days and better performers at 36. Benchmarks vary by specialty and payer mix, so a practice heavy in Medicare or Medicaid will run slower than one weighted toward commercial payers. Your own trend matters more than the national median.
Divide total accounts receivable by average daily charges, where average daily charges equals total charges over a period divided by the number of days in that period. Most practices use a trailing 90-day charge window to smooth out seasonality. For example, $350,000 in AR divided by $10,000 in average daily charges equals 35 days.
The most common causes are rising denials, slow charge entry, aged claims that aren’t being worked, a single slow payer dragging the average, and credentialing or enrollment gaps that cause claims to deny and sit. Breaking the number down by payer and by aging bucket usually reveals which cause is driving your increase.
Days in AR is the average collection speed across all your receivables. AR over 90 days is the percentage of your total AR that has aged past 90 days. You should watch both, because a practice can have an acceptable average while a growing block of aged claims quietly becomes uncollectible. Keep AR over 90 days under roughly 13 to 15% of total AR.
Faster than most expect, because the metric responds to process changes. A practice starting at 55 days can typically reach the low 40s within a quarter and the high 30s within two quarters. Reaching the top-performer range under 35 days usually takes six to nine months of sustained work on aged AR cleanup and clean-claim improvement.
Is Your AR Climbing? Find Out Why
A rising days-in-AR number is the earliest warning that your revenue cycle is leaking, and the longer it runs, the more claims age into buckets you’ll never collect. Most of the causes are fixable once you know which one is driving the increase.
MedBillingTech runs full-cycle medical billing for independent practices, with active denial management, aged-AR cleanup, and the credentialing coordination that stops enrollment-driven denials at the source. Billing priced at 3.99% of collections, with no long-term lock-in. Sixteen-plus years of revenue cycle experience.
If you want to know where your revenue cycle is leaking before deciding anything, the free billing audit reviews your AR, denials, and collection posture and shows you exactly where the money is stuck.
Or call (307) 243 2190 to talk through a rising AR number.
