Days in A/R: Formula, Benchmarks and How to Lower It

What Days in A/R Means

Days in accounts receivable (you’ll also see it called A/R days or AR days) is the average number of days it takes your practice to collect payment after a service is billed. Your A/R is simply the money that insurance companies and patients still owe you for visits that already happened.

Think of it as the length of your cash pipeline. If your days in A/R is 40, the money from a visit today will land in your account roughly 40 days from now. A shorter pipeline means steadier cash flow, fewer surprises and less money sitting where it can quietly turn into write-offs.

It’s one of a handful of revenue cycle numbers every practice should watch, along with net collection rate, clean claim rate and denial rate. What makes it so useful is that it reflects almost every step of your billing: how fast charges get entered, how clean your claims are, how quickly payers respond, how well denials get worked and how well patient balances get collected. When any of those slip, days in A/R goes up.

The Days in A/R Formula (With a Worked Example)

The standard AR days formula takes two steps, and you can do it on a calculator in under five minutes.

Step 1: Find your average daily charges

Average daily charges = Gross charges for a period ÷ Number of days in that period

Most practices use the last 12 months of charges (divide by 365) or the last three months (divide by 90). The three-month version reacts faster to recent changes, like adding a new provider or a busy flu season.

Step 2: Divide your net A/R by average daily charges

Days in A/R = (Total A/R − Credit balances) ÷ Average daily charges

Take out credit balances first. Those are overpayments you owe back to patients or payers, and leaving them in makes your number look better than it really is. The AAFP’s guide to days in A/R makes the same point.

A worked example

Here’s how it looks for a small practice with about $1.8 million in yearly charges:

Now run the same practice using the last three months instead. Say charges over the past 90 days were $495,000 because a nurse practitioner joined in the summer. Average daily charges become $5,500, and days in A/R drops to about 38.

Neither answer is wrong. What matters is picking one method and sticking with it, so you’re comparing like with like every month. If a billing company sends you reports, ask which method they use. A few other things to keep the same each time:

• Same charge basis. Most practices use gross charges. Switching between gross and expected (net) charges will swing the number.
• Same rule for collections accounts. Decide whether balances sent to a collection agency stay in A/R. If you’re unsure, track it both ways.
• Same day each month. Run it after month-end close so posting is complete.

What’s a Good Days in A/R Number?

There’s no single perfect number for every practice, but there are well-used ranges. AAPC’s guidance on revenue cycle metrics says average practices usually land between 35 and 50 days in A/R, top performers come in under 35, and anything over 50 signals a need for improvement. Many billing teams set a working goal of 30 to 40 days.

Don’t skip the A/R aging report

Days in A/R is an average, and averages can hide problems. A practice can show 38 days while a pile of claims quietly ages past 120 days. That’s why A/R aging (a report that sorts what you’re owed into 0-30, 31-60, 61-90, 91-120 and 120+ day buckets) belongs right next to it.

Two aging targets are worth knowing. The American College of Allergy, Asthma and Immunology, citing MGMA data, says ideally 70% or more of your A/R should sit in the 0-30 day bucket. For the oldest bucket, AAPC reports that most practices carry 12% to 25% of A/R over 120 days, best performers stay under 12%, and anything above 25% points to a weakness.

Why your number may look different

Benchmarks shift with specialty and payer mix, so compare yourself against practices like yours and, most of all, against your own trend. Here’s how common factors tend to pull the number:

Why Days in A/R Go Up

If your number has been climbing, you’re not alone. In a July 2026 MGMA Stat poll of 203 medical group leaders, 32% said their days in A/R were higher than a year earlier, 43% said about the same and only 22% said lower. Respondents pointed to payer delays and more initial denials as the main reasons.

Payer behavior is only part of the story, though. Most rising A/R traces back to a few things inside the practice:

• Charge lag. MGMA notes the typical gap between the visit and the submitted claim runs three to seven days. Every day a charge sits unbilled adds a day to your A/R.
• Front-end errors. The Change Healthcare 2024 Revenue Cycle Denials Index found that 44% of denials were front-end denials, and registration and eligibility issues alone caused 24%. A wrong member ID can add weeks to a claim.
• Denials that sit. A denied claim that waits two weeks in a work queue before anyone touches it is two weeks of lost time, plus the risk of missing the appeal deadline.
• No follow-up on silent claims. Some claims are never denied or paid. They just disappear unless someone checks the status.
• Patient balances. According to MGMA, practices collected 72% of copays at the time of service in 2024 but only about 27% of other patient-due balances. Those balances age fast.
• Staff turnover. When the one person who knew which payers to chase leaves, follow-up often stops without anyone noticing.

How to Reduce A/R Days: 7 Practical Steps

Here’s the good news: a lot of A/R time is in your control. A quick way to see what’s at stake is to look at your average daily charges. In our example, each day of A/R equals about $5,000. Bringing 42 days down to 35 would free up roughly $35,000 in cash that’s already been earned.

1. Verify eligibility before the visit

Check coverage, benefits and prior auth needs two to three days before the appointment, not at check-in. It’s the cheapest denial you’ll ever prevent. Our insurance eligibility and benefits verification checklist walks through the 12 steps.

2. Close encounters and post charges fast

Set a firm rule for charge entry. MGMA suggests closing encounters within 72 hours and posting charges within two days. Track which providers have open notes each Friday and follow up kindly but consistently.

3. Scrub claims before they go out

Use your clearinghouse or billing software edits to catch missing modifiers, invalid codes and demographic errors before submission. MGMA benchmarking shows first-submission denial rates have hovered around 7% to 8% for four years, and its 2025 report suggests getting below 5%. Each claim that’s paid the first time skips weeks of rework.

4. Work denials every day

Don’t let denials pile up for a weekly session. Work them daily, starting with the highest-dollar claims and the ones closest to their appeal deadline. Then fix the cause, not just the claim. If prior authorization is a repeat offender, see our guide on how to reduce prior authorization denials.

5. Follow up on claims with no response

Build a simple schedule. For example, check status on any electronic claim with no response after 21 to 30 days, and call or use the payer portal if there’s still nothing a week later. Note who you spoke with and the reference number, so the next person can pick it up.

6. Collect patient balances up front

Give patients a cost estimate before the visit, collect copays and known balances at check-in and offer easy ways to pay, like text-to-pay and card on file. Patients pay more readily when they know what to expect, and you avoid sending statement after statement.

7. Review A/R aging by payer every month

Run your aging report by payer, not just as one total. That’s how you spot the one plan that’s suddenly taking 60 days to pay. Escalate to the payer’s provider rep, and bring those reports with you when it’s time to renegotiate contracts.

Track Days in A/R Monthly (Simple Tracker)

You don’t need fancy software. A simple spreadsheet updated once a month is enough to show whether things are moving the right way. Here’s a layout you can copy, with three example months filled in:

Add a notes column for anything unusual, such as a payer outage, a new provider or a billing system change. Then review it with your billing team or billing partner each month. If days in A/R stays above 50 for three months in a row, or more than a quarter of your A/R is past 120 days, that’s a sign the process needs a deeper look, not just more effort.

At that point, some practices hire and train another biller. Others bring in outside help. If you’re weighing both, our breakdown of in-house vs outsourced medical billing compares the real costs, and our guide on how to choose a medical billing company lists the questions to ask before you sign.

The Bottom Line on Days in A/R

Days in A/R is one of the simplest numbers you can track, and one of the most telling. Calculate it the same way every month, keep an eye on your A/R aging, and aim for under 35 days if you can. Most of the fixes aren’t complicated. They come down to clean claims on the front end, fast charge entry and steady, daily follow-up on the back end.