Days in AR (Days in Accounts Receivable) measures how long your practice takes to collect payment after a service is billed. The MGMA benchmark for physician groups is under 40 days. High-performing practices reach 30 days or less. If your number sits above 50, revenue is leaking — and the fix starts with your front-end billing process.
What Are Days in AR in Medical Billing?
Days in AR, also written as Days in A/R or DAR, is one of the most watched numbers in revenue cycle management. It tells you the average number of days that pass between the date a service is delivered, the claim is submitted, and your practice actually receives payment.
The number seems simple, but it carries a lot of information. A rising Days in AR figure usually points to one or more problems happening upstream: claims submitted late, denials not being worked quickly enough, eligibility not verified before the patient arrives, or a follow-up process that lets aging claims slip through the cracks.
According to MGMA 2026 data, 32% of medical practices reported their Days in AR increased compared to the previous year. Only 22% saw it drop. That gap reflects how hard it has become for in-house billing teams to keep pace with payer policy changes, prior authorization volume, and denial complexity.
How to Calculate Days in AR
The formula is straightforward. Run it monthly to track whether your AR position is improving or drifting.
Days in AR = Total Accounts Receivable / Average Daily Charges
To find average daily charges, divide your total charges for the last 90 days by 90. Then divide your current total AR balance by that number.
Example: A practice with $420,000 in outstanding AR and $10,000 in average daily charges has 42 Days in AR. That puts them at the industry average, but still above where high performers operate.
Use a 90-Day Charge Window, Not 30
Many practices make the mistake of calculating average daily charges from the last 30 days. That introduces seasonal volatility. A slow vacation month or a high-volume surgical month will distort the number. Using 90 days smooths out the variation and gives you a more accurate read.
What Is a Good Days in AR Number?
The widely accepted benchmarks come from MGMA and HFMA, the two leading associations that publish revenue cycle performance data for medical practices.
| Days in AR Range | What It Means | Action Required |
|---|---|---|
| Under 30 days | High-performing practice | Maintain current workflows |
| 30 to 40 days | Within best-practice range (MGMA target) | Monitor monthly, look for trending |
| 40 to 50 days | Industry average — revenue is delayed | Identify top denial reasons and front-end gaps |
| 50 to 60 days | Below average — cash flow risk | Audit billing workflow within 30 days |
| Over 60 days | Serious problem — revenue at risk of write-off | Immediate RCM intervention needed |
MGMA places the median physician group practice at 42 to 47 days in 2026. Top performers consistently land below 30. The gap between median and top performer represents real, recoverable revenue sitting uncollected in your AR bucket.
7 Reasons Your Days in AR Is Too High
High Days in AR is always a symptom. These are the seven causes that show up most often when we audit a practice’s billing process.
1. Claims Are Not Going Out the Same Day
Every day a claim sits before submission adds a day to your AR. A claim submitted 48 hours after the service date starts behind before the payer even opens it. High-performing practices submit claims same-day or within 24 hours of service. If your billing cycle runs weekly or batches submissions, that pattern alone can add 5 to 10 days to your AR figure.
2. Eligibility Was Not Verified Before the Visit
Insurance information that looks correct in your system may be outdated. A patient whose coverage lapsed two months ago, a plan that changed at the start of the year, or a secondary insurance not captured at intake — all of these create claims that come back denied and have to be reworked from scratch. MGMA benchmarks suggest practices should verify eligibility on 95% or more of claims before service. Most practices fall well below that.
3. Denial Rate Is Above 8%
The MGMA standard for first-pass denial rate is 8% or lower, with best-in-class reaching 3% to 4%. Every denied claim adds days to your AR because it requires rework before it can be resubmitted. A practice denying 15% of claims on first pass is spending enormous staff time reworking claims while the original AR clock keeps running. The cost to rework a single denied claim averages $25 to $30 in staff time, and that does not count the delay in payment.
4. No Systematic Follow-Up on Unpaid Claims
Payers do not always reject claims outright. Sometimes they simply do not pay. A claim can sit pending for 30, 60, or 90 days without generating a denial — meaning your billing team has no automatic trigger to work it. Without a structured follow-up schedule (typically 14 days for electronic claims, 30 days for paper claims), these aging balances accumulate quietly until they become write-offs.
5. AR Aging Bucket Is Not Being Worked by Priority
Not all AR is equally at risk. A claim that is 35 days old from a commercial payer is not the same as a claim that is 85 days old approaching a timely filing limit. Practices that work their AR as a flat list rather than by aging bucket and payer priority end up spending time on low-risk balances while high-risk balances age past the point of collection.
6. Coding Errors on Original Claims
An estimated 80% of medical bills contain at least one error, according to industry data published by Aptarro in 2025. Even a small rate of coding mistakes — wrong modifiers, missing diagnosis codes, upcoding or undercoding — generates a predictable stream of denials and delays. Each one pushes that claim’s contribution to your AR further out.
7. Prior Authorizations Not Tracked Systematically
A procedure performed without a valid authorization, or with one that expired before the service date, will be denied. Prior auth denials are among the most time-consuming to appeal because they require clinical documentation and often direct contact with the payer. Practices that do not track authorization expiration dates and renewal timelines accumulate these denials as a predictable drag on Days in AR.
8 Proven Ways to Reduce Days in AR
- Submit claims within 24 hours of service. Set a hard internal deadline. Same-day submission is achievable for practices with properly structured billing workflows. This single change can cut Days in AR by 5 to 10 days for practices currently batching weekly.
- Verify insurance eligibility 24 to 48 hours before every appointment. Real-time eligibility checks catch coverage lapses before they become denied claims. Most practice management systems have this built in — the question is whether it is being used consistently for every patient, every visit.
- Build a denial tracking system with root-cause categories. Log every denial by payer, reason code, and service type. After 30 days you will see patterns. If CO-4 (inconsistent modifier) is appearing consistently from one payer, that is a coding fix. If CO-97 (service included in global period) keeps coming up, that is an education issue for your surgical billing team. Tracking turns reactive denial management into preventive action.
- Set a 14-day follow-up trigger for all unpaid electronic claims. Do not wait for a denial. If a claim has not been paid or adjudicated within 14 days of submission, it should trigger an automatic follow-up check. For paper claims, extend that to 30 days.
- Work your AR aging bucket by priority, not by volume. Claims approaching timely filing deadlines (usually 90 to 180 days depending on the payer) should be worked first, regardless of dollar amount. A $200 claim at day 85 is more at risk than a $2,000 claim at day 25. Sort by risk, not by size.
- Review and appeal denials within 48 hours. Every day a denial sits unworked is a day the resubmission timeline shrinks. Best-in-class billing teams have a dedicated denial queue that is reviewed daily. Denials older than 7 days without a response represent a workflow gap.
- Run monthly clean claim rate audits. Pull a sample of 50 to 100 claims submitted in the previous month and check them against the remittance data. If your clean claim rate is below 95%, you have a front-end accuracy problem — and clean claim rate problems compound directly into Days in AR.
- Segment AR by payer and track each separately. Medicare, Medicaid, and commercial payers all have different payment timelines and denial patterns. Lumping them together masks which payer relationships are dragging your overall AR figure. A practice with 60-day AR may find that Medicare is at 28 days and one commercial payer is at 90, which completely changes the intervention.
In-House vs Outsourced AR Management: What the Numbers Show
For many practices, the root cause of high Days in AR is not a process problem — it is a capacity and specialization problem. In-house billing teams are managing a growing workload of payer rule changes, prior authorization requirements, and denial complexity without proportional increases in staff or training.
| Factor | In-House Billing Team | Outsourced RCM Partner |
|---|---|---|
| Days in AR (typical) | 42 to 55 days | 28 to 38 days |
| Clean claim rate | 75% to 88% | 94% to 97% |
| Denial rate | 10% to 18% | 3% to 6% |
| Denial follow-up speed | 3 to 7 days (when staffed) | 24 to 48 hours |
| Staffing continuity | Disrupted by turnover, leave, training | No single-point-of-failure |
| Payer rule updates | Learned reactively after denials | Monitored proactively |
| Cost to collect | 8% to 14% of net collections | 4% to 8% of net collections |
The data from MGMA consistently shows that practices using specialized RCM partners outperform in-house teams on Days in AR, denial rate, and net collection rate. The gap is not because in-house billers are less capable — it is because an outsourced team is doing this work all day, across multiple specialties, with dedicated denial analysts and real-time payer intelligence.
AR Over 90 Days: The Hidden Write-Off Risk
Days in AR as a single number does not tell the full story. A practice at 38 days could still have a serious problem if a large portion of that AR is concentrated in very old claims. That is why the percentage of AR over 90 days is tracked separately.
MGMA places the industry average for AR over 90 days at approximately 13.5% of total receivables. Best-in-class practices keep this under 10%. Claims sitting past 90 days are at serious risk: many commercial payers have timely filing limits between 90 and 180 days from the date of service. Once that window closes, the claim cannot be resubmitted regardless of how valid it is.
If more than 15% of your AR is older than 90 days, the problem is not just a billing issue — it is an accounts receivable recovery situation. Those claims need to be triaged, worked aggressively, and appealed before they age out entirely.
Frequently Asked Questions
What is considered a good Days in AR for a medical practice?
MGMA and HFMA both benchmark the target at under 40 days for physician groups. High-performing practices consistently achieve 25 to 30 days. Anything above 50 days is considered below average and signals a need to review the billing workflow. The right benchmark also depends on specialty — surgical practices with high prior auth volume tend to run slightly higher than primary care due to the nature of their payer mix.
What is the Days in AR formula in medical billing?
Days in AR = Total Accounts Receivable divided by Average Daily Charges. To calculate average daily charges, add up total charges from the past 90 days and divide by 90. Using a 90-day window gives a more accurate result than a 30-day window because it smooths out monthly volume variations.
What causes high Days in AR in medical billing?
The most common causes are late claim submission, high first-pass denial rates, no systematic follow-up process, insurance eligibility not verified before visits, and AR aging buckets not being worked by priority. Any one of these can push Days in AR above 50. Most practices with high AR have more than one of these problems running simultaneously.
How much does high Days in AR actually cost a practice?
The cost compounds in two ways. First, delayed collection means that money is not available for payroll, supplies, or reinvestment — a cash flow problem even if the money eventually arrives. Second, claims that age past timely filing deadlines become uncollectable write-offs. A practice billing $3 million annually that writes off 3% more than it should due to aging AR is losing $90,000 per year to a recoverable process problem.
How long does it take to reduce Days in AR after fixing billing workflows?
Practices that fix front-end processes — same-day submission, eligibility verification, denial tracking — typically see Days in AR begin to drop within 30 to 60 days. The full improvement takes 90 to 120 days because the AR bucket reflects the last 3 to 4 months of activity, and older claims need to work their way through the cycle. The improvement in denial rate and clean claim rate shows up faster than the Days in AR number itself.
When does it make sense to outsource AR management to an RCM company?
If your Days in AR is above 45 and has been trending up for more than two months, that is a signal the in-house team is not keeping up. Other triggers include a denial rate above 10%, more than 15% of AR aging past 90 days, or frequent staff turnover in the billing department. Outsourcing works best when the problem is structural rather than one bad month, and when the practice wants a predictable cost-to-collect rather than managing billing headcount directly.
Written by
Umesh Kushwaha Operations Manager, Aayur Solutions LLCUmesh Kushwaha is the Operations Manager at Aayur Solutions, running day-to-day delivery across medical coding, AR follow-up and denial management teams for DME, dental and pain management practices.
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