| Short answer: Accounts receivable days, also called days in A/R, is the average number of days your practice waits to get paid for the care it provides. You find it by dividing your total unpaid accounts receivable by your average daily charges. A lower number means money reaches your bank faster. Many practices aim for 30 to 40 days, and top performers stay under 30. |
Your schedule can be full, your claims can go out on time, and your practice can still feel short on cash. When that happens, the problem is rarely how much you bill. It is how long you wait to be paid.
Payroll, rent, supplies, and software bills arrive on a fixed date. Insurance payments do not. Accounts receivable days is the number that measures the gap between the two. Once you understand it, you can spot trouble in your billing process weeks before it turns into a cash crunch.
This guide explains what A/R days means, how to calculate it, what a healthy number looks like, why it goes up, and what you can do about it. No finance degree is needed.
What Are Accounts Receivable Days in Medical Billing?
Accounts receivable, or A/R, is all the money owed to your practice for care you have already delivered. Most of it sits with insurance companies as unpaid or pending claims. The rest is patient balances, such as deductibles, coinsurance, and self-pay bills.
Accounts receivable days turn that pile of unpaid money into a measure of time. Instead of saying “we have $340,000 outstanding,” it tells you how many days of your billing that amount represents. That one change makes the number easy to compare from month to month, and from one practice to another, even when the practices are very different in size.
A simple way to picture it
Imagine your practice bills about $10,000 every day. If your A/R days is 34, roughly 34 days of that billing, or about $340,000, has not been paid yet. If you bring A/R days down to 29, the unpaid pile shrinks to about $290,000, and the $50,000 difference becomes cash you can actually use.
Other names you may see
Different software and reports use different labels. You may see days in A/R, A/R days, days sales outstanding (DSO), or days revenue outstanding (DRO). They all point to the same idea: how long it takes to turn your charges into collected money.
Why A/R Days Matters for Your Practice
It shows how fast your cash is moving
Think about what leaves your bank account on a fixed schedule: payroll, rent, malpractice insurance, software, and supplies. None of these wait for a payer to finish processing a claim. Every extra day in A/R is a day of earned income that you cannot spend. MGMA made this same point in its July 2026 analysis of days in A/R, noting that these bills come due on schedule whether or not claims have cleared.
It works as an early warning system
When A/R days climb, something earlier in the billing process has usually slipped. Claims may be going out late, denials may be piling up, a payer may have slowed down, or follow-up may have fallen behind. You can often see the pattern in A/R days weeks before it shows up as a cash problem. Delays across the revenue cycle management can affect how quickly claims turn into collected revenue.
It is a problem for many practices right now
In a July 28, 2026 MGMA Stat poll of 203 medical group leaders, 43% said their days in A/R were about the same as a year earlier, 32% said they were higher, and 22% said they were lower. Among the leaders whose number went up, the most common explanation was payer behavior, including slower payments, more initial denials, and downcoded claims. Staffing gaps and system changes added to the delays.
| Why this matters: Every day of A/R is tied to one day of your charges. If your practice bills $10,000 a day, cutting A/R days by five frees up about $50,000 of cash that was stuck waiting. |
How to Calculate Accounts Receivable Days
The formula
Days in A/R = Total accounts receivable ÷ Average daily charges
Average daily charges = Total charges for the period ÷ Number of days in the period
Here is how it works in practice. First, pull your total A/R from your practice management system. This usually comes from the A/R aging report as of the last day of the month. Second, add up your charges for a set period. Many practices use the last 12 months to smooth out seasonal swings, while some use the last 90 days to catch changes sooner. Third, divide those charges by the number of days in that period to get your average daily charges. Finally, divide your total A/R by your average daily charges. The result is your A/R days.
A worked example
Take a four-physician internal medicine group. Here are its numbers:
| Item | Amount |
| Charges over the last 12 months | $3,650,000 |
| Number of days in the period | 365 |
| Average daily charges ($3,650,000 ÷ 365) | $10,000 |
| Total A/R today (all aging buckets) | $340,000 |
| Days in A/R ($340,000 ÷ $10,000) | 34 days |
At 34 days, this group sits inside the range most benchmarks call healthy. It still has room to improve, and the aging report (covered below) will show where.
Should you use gross charges or adjusted charges?
Some practices divide by gross charges, which are the full prices on your fee schedule. Others use adjusted charges, which are charges after contractual write-downs are taken out. Both are common. Benchmark surveys often report days using adjusted charges, so the number you see in a report may not match the number you calculate on your own.
| Note: Pick one method and use it every month. A steady method lets you trust the trend. Before you compare your result to any benchmark, check which method that benchmark used. |
What Is a Good A/R Days Number?
There is no single perfect number, but the ranges below are widely used by practice managers and billing teams.
| A/R days | What it usually means |
| Under 30 | Strong performance. Claims are clean, submitted fast, and followed up on. |
| 30 to 40 | Healthy and the most common target for physician practices. |
| 41 to 50 | Worth a closer look. Cash is starting to slow down. |
| Over 50 | A warning sign. Balances are aging, and older balances are harder to collect. |
MGMA’s benchmark is commonly cited as under 40 days for physician groups, with high performers keeping the number below 30. Other industry sources place a well-run practice between 30 and 35 days. These ranges are close enough to guide your goal without arguing over a single day.
Your specialty matters too. A surgical practice that bills after a hospital discharge, or a practice with many self-pay patients, will often run higher than a primary care office. For that reason, the most useful comparison is your own number over time, followed by practices that look like yours.
| Note: A rising trend matters more than any single reading. If your A/R days move from 32 to 36 to 41 over three months, act now, even though 41 is not far from the target. |
A/R Days vs. A/R Aging: Why You Need Both
A/R days are average, and averages can hide problems. Picture two practices that both report 38 days. In the first, less than 15% of the unpaid balance is older than 90 days. In the second, 30% are older than 90 days. The first practice is in good shape. The second has a pile of old balances that may never be collected, even though the headline number looks the same.
That is why billing teams look at the A/R aging report alongside A/R days. The aging report sorts your unpaid balances by how long they have been waiting.
| Age of balance | What it usually means | What to do |
| 0 to 30 days | Normal processing time. Most of your A/R should sit here. | Keep claims clean and submit fast. |
| 31 to 60 days | The claim may be slow, pending, or waiting on information. | Check claim status and follow up. |
| 61 to 90 days | Likely a problem such as a denial, missing data, or a payer error. | Work these balances actively. |
| 91 to 120 days | At risk. Each week makes collection harder. | Escalate and appeal where needed. |
| Over 120 days | High risk of never being paid. | Review for correction, appeal, or write-off under your policy. |
Time also works against you in a legal sense. Medicare generally requires claims to be filed within 12 months of the date of service, and many commercial payers set much shorter filing and appeal windows in their contracts. Once a deadline passes, the money is usually gone for good. A/R aging is one of several performance indicators that help practices evaluate the importance of revenue cycle management beyond simply tracking monthly collections.
Pro tip: Run your aging report by payer, not only in total. This shows you which insurance companies are slow, how much money each one is holding, and how long you have been waiting. It also gives you real numbers to bring to a contract discussion.
What Makes A/R Days Go Up?
Delays in getting paid fall into two groups: the ones that start in your office and the ones that start with payers. Knowing which is which tells you where to put your effort.
Delays that start in your office
Registration and eligibility errors. A wrong policy number, an inactive plan, or a missing authorization can stop a claim before it begins. These mistakes are cheap to prevent at check-in and expensive to fix later.
Slow charge entry and unsigned notes. The clock starts on the date of service, not on the date you submit. MGMA suggests that clinicians close encounters within 72 hours and that staff post charges within two days, compared with the three to seven day lag seen across the industry.
Coding mistakes. Incorrect or incomplete coding leads to rejections and denials, and every one of them adds days.
Staffing gaps and system changes. MGMA’s poll respondents pointed to billing staff turnover, hard-to-replace A/R specialists, credentialing delays for new providers, and changes to billing companies or software. One practice reported that a system transition delayed billing by two months. Changes in staffing or billing operations may also prompt practices to compare onshore vs. offshore medical billing models when evaluating how to manage follow-up workloads.
Patient balances. Patients are now responsible for a larger share of the bill. MGMA data shows practices collected about 72% of copayments at the time of service in 2024 but only about 27% of other patient-due balances. Everything not collected at the visit moves into statements, phone calls, and older aging buckets. One practice in the poll kept its insurance A/R within 28 days, yet its overall number rose to 32 days because of self-pay balances.
Delays that start with payers
Payers slow things down through long processing times, initial denials, downcoding, requests for medical records, prepayment audits, and drawn-out appeals. You may not be able to stop these behaviors, but you can track them by payer, escalate repeat problems, and use the data in contract talks.
Denials: the biggest clock-restarter
A denied claim does not just wait. It goes back to the start. Your team has to find the reason, correct or appeal, and resubmit, while the balance moves into older aging buckets. In MGMA’s January 2026 poll, 48% of leaders named denials and appeals as their practice’s largest source of revenue leakage, compared with 23% who named front-end issues. MGMA benchmarking puts first-submission denials at 7% to 8% over the past four years, and its data suggests that targeted process fixes can bring the rate under 5%. Understanding why medical claims are getting denied in 2026 can help billing teams identify recurring issues before they become older A/R balances.
Common Mistakes When Reading A/R Days
The number is simple, but it is easy to misread. These are the mistakes billing teams make most often.
Looking only at the total. A healthy overall number can hide one payer that is paying very slowly. Always split the number by payer and by aging bucket.
Writing off balances early to improve the number. Write-offs shrink A/R, so A/R days drop, but no cash arrives. A better number that comes from write-offs is not a real improvement.
Changing the method from month to month. Switching between gross and adjusted charges, or between a 12-month and a 90-day window, makes the trend meaningless.
Ignoring patient balances. Insurance A/R may look fine while self-pay balances quietly push the total up.
Checking it only once in a while. A/R days should be reviewed every month, and the aging report should be worked every week.
How A/R Days Connects to Other Billing Numbers
A/R days is the result. The numbers below are the causes. If A/R days are high, these metrics usually show why.
| Metric | What it tells you | Common reference point |
| Clean claim rate | How many claims are paid correctly on the first submission | 95% or higher |
| First-submission denial rate | How often payers reject a claim at first pass | 7% to 8% today, under 5% is achievable |
| A/R over 90 days | How much of your unpaid balance is old and at risk | Under 15% is a common guide |
| Time-of-service collection | How much of the patient’s share you collect at the visit | Copays collected at about 72% in 2024 |
These metrics also help practices evaluate the broader revenue cycle management process, including claim submission, payment posting, and denial follow-up.
| Note: Treat these figures as reference points, not rules. The right target depends on your specialty, payer mix, and size. |
A Simple Plan to Lower Your A/R Days
You do not need to fix everything at once. Start with these steps, in this order.
1. Measure it the same way every month. Write down your method, your period, and your result.
2. Split the number by payer and aging bucket. Find the two or three payers or buckets that hold the most money.
3. Fix the front end. Verify eligibility before the visit, confirm authorizations, and collect copays and known balances at check-in.
4. Speed up claim submission. Aim to close encounters within 72 hours and post charges within two days.
5. Work denials every day. Start with high-dollar claims and the closest appeal deadlines, then review your top five denial reasons for causes you can prevent.
6. Review slow payers each quarter. Bring payer-level aging data to your payer representatives and your contract reviews.
A realistic example comes from the MGMA poll. One respondent reported an overhaul of its revenue cycle process that brought days in A/R from 67 down to under 34. This was a self-reported result from a single practice, and your own results will depend on your starting point. Still, it shows how much room a process can have when someone owns it.
For a deeper walkthrough of each tactic, read how to reduce accounts receivable days in medical billing.
When It Makes Sense to Get Help
Lowering A/R days is not a one-time project. It takes steady work every week: checking claim status, appealing denials, tracking payers, and chasing patient balances. When billing staff are stretched thin or positions stay open, this is the work that slips first, and A/R days is where it shows up.
That is where a billing partner can help. At Proactive Healthcare Services, we work with medical practices across the United States on medical billing and MIPS services. We usually begin with a review of your A/R aging report to show where money is stuck, which payers are slowing you down, and which denials can be prevented. From there, we build a follow-up plan your practice can measure month after month. Because MIPS payment adjustments also affect what your practice collects, we look at both sides of your revenue.
If your A/R days are above 40, or climbing, send us your latest aging report. We will show you what we see, and you can decide what to do next.
Frequently Asked Questions
What does A/R days mean in medical billing?
A/R days is the average number of days it takes your practice to collect payment after providing care. It shows how quickly your billed charges turn into cash.
What is the formula for days in A/R?
Divide your total accounts receivable by your average daily charges. To get average daily charges, divide your total charges for a period by the number of days in that period.
What is a good A/R days number for a medical practice?
Most practices aim for 30 to 40 days. MGMA’s benchmark is commonly cited as under 40 days, and high performers stay below 30. Specialty and payer mix can move the number up or down.
Is a high A/R days number always bad?
Not always. Some specialties naturally run higher because of how and when they bill. A number that is climbing month after month is the real concern, since it points to a process or payer problem that needs attention.
How often should I check A/R days?
Check it at least once a month, using the same method each time. Review the A/R aging report every week so older balances do not slip through.
What is the difference between A/R days and A/R aging?
A/R days gives you one average number for how long you wait to be paid. A/R aging breaks your unpaid balances into time groups, such as 0 to 30 days or over 120 days, so you can see exactly where old money is sitting.
Can outsourcing medical billing lower A/R days?
It can, when the billing partner improves claim accuracy, submission speed, and denial follow-up. In the MGMA poll, some practices reported improvements after moving billing in-house, while others improved after outsourcing or changing vendors. The result depends on the quality of the process, not only on who does the work.
