Accounts Receivable in Medical Billing — Is Your Practice Collecting What It's Owed?
By Medtransic | April 9, 2026 | 10 min read | Updated: April 9, 2026
Quick Summary: Most practices don't have an AR problem — they have an aging AR problem. Claims over 90 days collect at 50%. Over 120 days, just 25%. Here's how to know where your practice stands and what's still recoverable.
Right now, your practice has money sitting in accounts receivable — claims submitted, services rendered, payment not yet received. Some of that money will come in within the next 30 days. Some of it is already at risk. And some of it is statistically unlikely to ever be collected. Financially healthy practices know exactly which bucket each dollar falls into — and act before it moves into the unrecoverable category.
If you're not actively managing your medical accounts receivable, you're not just waiting for payment. You're watching revenue expire. Medtransic's AR management team was built specifically to stop that from happening.
- 50% Collection Rate at 90 Days - Half your face value — already
- 25% Collection Rate at 120 Days - 3 in 4 dollars statistically gone
- 8–14% Recoverable Revenue Found - In Medtransic's incoming AR audits
- 35 days Best-in-Class Days in AR - National avg for independents: 55–65
What AR Actually Means for Your Practice
Accounts receivable in medical billing is the total money owed to your practice for care you've already provided — from insurers, patients, Medicare, and Medicaid. It's money that hasn't been paid yet. Every claim you submit creates an AR balance. When it gets paid, it clears. When it doesn't, it ages. Aged AR is one of the most expensive silent problems a practice can have.
What makes medical AR different from any other industry is the number of parties involved and the complexity of each payment decision. A commercial insurer can deny a claim for dozens of reasons — a missing modifier, an authorization not obtained, a diagnosis code that doesn't support the procedure. A patient's balance depends on their deductible, plan year, and out-of-pocket maximum. Every payer and every claim requires follow-up — and if that follow-up doesn't happen within the right window, the money starts to disappear. This is why revenue cycle management is a full-time, specialized function.
The 90-Day Cliff Nobody Warns You About
Here is the most important thing to understand about medical AR: it loses value over time, and it loses value fast. A claim that's 30 days old is nearly always recoverable. A claim that's 60 days old has probably hit a denial or follow-up gap — but it's still fixable. A claim that crosses 90 days unpaid? The collection rate drops to roughly 50% of face value. Cross 120 days and you're looking at a 25% collection rate on average. That's not a billing problem. That's revenue evaporating from claims you already worked for.
Most denials have a filing deadline for appeals — typically 60 to 180 days depending on the payer. Let a denied claim sit past that window and the appeal right is gone. Patient balances have a collection curve too — the longer a patient goes without hearing from your practice, the less likely they are to pay voluntarily. The practices that lose the most aren't the ones with high denial rates. They're the ones with adequate denial rates but poor follow-up.
| AR Age | Avg Collection Rate | What's Usually Happening | Action Required |
|---|---|---|---|
| 0–30 days | 95–100% | Claim submitted, awaiting standard processing | Monitor — no action needed yet |
| 31–60 days | 85–95% | Pending payment or soft denial — still easily recoverable | Verify status, resubmit if denied |
| 61–90 days | 60–75% | Likely a denial, missing info, or follow-up gap | Immediate follow-up, appeal if needed |
| 91–120 days | 40–50% | Claim has been ignored or appeal window is closing | Urgent intervention — appeal deadlines near |
| 120+ days | 10–25% | Appeal windows mostly closed, patient debt harder to collect | Recovery attempt — accept some write-offs |
What Healthy AR Looks Like
The benchmark for a healthy practice is what's called days in AR — the average number of days from service to payment. The American Academy of Family Physicians recommends keeping days in AR below 40. Best-in-class practices run at 28–35 days. The national average for independent practices is 55–65 days. Many practices running without active AR management are sitting at 70–90 days without realizing it — because the money does eventually come in, just slowly.
Another key metric: the percentage of your AR that's over 90 days old. In a healthy practice, less than 15–20% of total AR should sit beyond 90 days. If your over-90 bucket is 30%, 40%, or higher, a meaningful portion of your outstanding balance is already statistically impaired. The real question isn't how to collect it — it's how to stop the same thing from happening to the claims you're submitting this week.
- Days in AR
- Days in AR (also called Days in Accounts Receivable) is the average number of days between the date of service and the date payment is received. It is calculated by dividing total AR by average daily charges. A days-in-AR under 35 indicates a well-managed billing operation. Above 55 days signals a systematic follow-up problem — claims are aging faster than they're being worked.
| Metric | Healthy Benchmark | Warning Sign | Critical |
|---|---|---|---|
| Days in AR | Under 35 days | 35–55 days | Over 55 days |
| AR over 90 days (%) | Under 15% | 15–25% | Over 25% |
| First-pass denial rate | Under 5% | 5–10% | Over 10% |
| Clean claim rate | Over 95% | 90–95% | Under 90% |
| Collection rate | Over 95% | 85–95% | Under 85% |
Why AR Ages — The Real Reasons
When a practice's AR starts aging, there are usually a handful of root causes — and most of them aren't obvious from looking at the AR report itself. You see the number. You don't always see what created it. Understanding the cause is the only way to stop the same claims from aging again next month.
- Denials that never got worked. The most common contributor to aging AR is denials that got filed, got denied, and never got appealed. In a busy practice, denied claims get triaged — high-dollar ones get attention, low-dollar ones get written off because chasing a $45 denial costs more in staff time than it pays. Multiply that across hundreds of claims a month and the write-offs add up. Medtransic's denial management process works every denial regardless of dollar amount, because the pattern of what gets denied is more valuable to fix than any single claim.
- Insurance verification gaps at the front end. A lot of AR problems start before the patient walks in the door. If eligibility wasn't verified before the appointment — or was verified but not thoroughly — claims go out to inactive policies, wrong plan years, or payers who don't have the right provider information on file. Medtransic's insurance verification process runs before every scheduled appointment, not as a spot check.
- No systematic AR follow-up process. AR follow-up is the process of proactively checking on unpaid claims — calling payers, checking status, resubmitting after corrections, escalating appeals. In practices where billing staff also handle intake and patient calls, systematic follow-up is the first thing that falls behind. A dedicated follow-up workflow that prioritizes by payer, age, and dollar amount is the difference between a 35-day AR and a 75-day AR.
- Patient balance collection. With the rise of high-deductible health plans, the patient portion of every bill has grown significantly. Research shows patient balance collection rates drop to around 57% when patients are billed after the fact rather than collected at the time of service. That 43% gap lands directly in your AR and ages fast.
Old AR: What's Still Recoverable
If you're looking at your AR aging report and seeing significant balances in the 90-day, 120-day, or older buckets, the question isn't why it happened. The question is how much is still worth pursuing. That depends on three things: how old the claims are, which payer is involved, and whether the denial reason is still correctable.
When Medtransic takes over a practice's billing, we run a full retroactive audit on the existing AR before doing anything else. In most cases we find 8–14% of total revenue sitting in recoverable claims that the previous billing process either wrote off prematurely or never followed up on. That recovery pays for months of billing service — and it comes from work that was already done, patients that were already seen, money that was already earned.
When to Outsource AR Management
Most practices reach a point where in-house AR management stops scaling. The billing staff is capable, but they're also handling phones, prior authorizations, patient check-ins, and scheduling. AR follow-up is the first thing that gets deprioritized when the day gets busy. And unlike a missed appointment, nobody calls you when a claim goes unworked for 45 days. It just ages quietly.
The signal to outsource isn't a billing crisis — it's the slower, quieter signs. Collections feel lower than they should relative to your volume. Write-offs are creeping up. Staff spend more time on billing administration than on patient care. The over-90 AR bucket keeps growing month over month. These are early indicators the in-house model is hitting its ceiling. The cost of the status quo — in unrecovered revenue — is higher than the cost of a dedicated billing partner.
| With Dedicated AR Management | Without Dedicated AR Management |
|---|---|
| Every claim worked on a defined follow-up schedule | Follow-up happens when staff have time — which is rarely |
| Denials appealed within payer windows, every time | Low-dollar denials written off instead of appealed |
| Days in AR stays below 35 — cash flow is predictable | Days in AR creeps toward 60, 70, 80 without an alarm |
| AR aging report shows mostly 0–30 day balances | Over-90 bucket grows quietly every month |
| Old AR recovered before appeal windows close | Old AR gets written off — money earned but never collected |
| Root cause analysis stops the same denials recurring | Same denial reasons repeat month after month |
How Medtransic Manages AR for Medical Practices
Medtransic handles the full AR cycle — from claim submission through final payment — for medical practices that want their billing running cleanly without managing it themselves. Every claim goes out clean. Every denial gets worked within the appeal window. Every patient balance gets structured follow-up. Every aging report gets reviewed by a team whose only job is making sure nothing falls through the cracks.
For new clients, Medtransic starts with a retroactive AR audit before touching anything else. We go through 90 days of existing claims, identify every stalled or underpaid balance, and produce a recovery plan with specific dollar amounts. Most practices find 8–14% of recent revenue sitting in recoverable claims that slipped through their current process. We integrate directly with the systems you already use — Epic, AdvancedMD, eClinicalWorks — so transition is seamless and claim submission continues without interruption.
The result is a practice that knows exactly what's in its AR, why it's there, and what it's worth. No more discovering six months later that last quarter's revenue quietly wrote itself off.
Frequently Asked Questions
What is accounts receivable in medical billing?
Accounts receivable in medical billing is the total money owed to your practice for services already provided — from insurance companies, patients, Medicare, and Medicaid — that hasn't been paid yet. Every claim you submit creates an AR balance. When it's paid, it clears. When it isn't, it ages. The older it gets, the less likely it is to be collected at full value. Managing AR means actively tracking every unpaid claim, working denials within appeal windows, and following up on patient balances before they become write-offs.
What is a normal days-in-AR number for a medical practice?
Best-in-class practices run at 28–35 days in AR. The American Academy of Family Physicians recommends staying below 40 days. The national average for independent practices is 55–65 days. If your days-in-AR is above 55, it typically signals a systematic follow-up problem — claims are aging faster than they're being worked. Medtransic's AR management consistently brings client practices below 35 days within 90 days of onboarding.
What percentage of my AR should be over 90 days old?
In a healthy practice, less than 15–20% of total AR should be past 90 days. If your over-90 bucket is above 25–30%, a meaningful portion of your outstanding balance is already statistically impaired — collection rates at 90 days average around 50%, and drop to 25% at 120 days. The goal isn't just to collect what's already aging — it's to build a process that stops claims from reaching 90 days in the first place.
Can old AR — claims over 90 or 120 days — still be recovered?
Some of it can. Whether a claim is recoverable depends on how old it is, which payer is involved, and whether the denial reason is still correctable or appealable. When Medtransic audits incoming practices, we find 8–14% of total revenue sitting in recoverable old AR the previous billing process had written off or abandoned. The older the claims, the smaller the recoverable pool — but a structured audit almost always finds collectible money that was left behind.
What is AR follow-up in medical billing?
AR follow-up is the process of proactively checking on unpaid claims — contacting payers for status, resubmitting after corrections, escalating formal appeals, and following up on patient balances. In practices without a dedicated follow-up process, claims sit until someone notices them — by which point the 90-day collection cliff has often already been crossed. A structured AR follow-up workflow prioritizes by payer, claim age, and dollar amount to ensure nothing ages past the appeal window.
What is the difference between AR management and denial management?
Denial management focuses specifically on claims that have been denied — identifying the reason, correcting the issue, and filing appeals within the payer's deadline. AR management is broader — it covers the full lifecycle of every unpaid claim, including those that haven't been denied yet but haven't been paid either. In practice, the two overlap significantly: most aging AR contains a high proportion of unworked denials. Medtransic handles both as a unified process rather than treating them as separate functions.
Find Out What Your AR Is Actually Worth
Medtransic's free 90-day AR audit shows you exactly where your revenue is stalling, which claims are still recoverable, and what your days-in-AR number actually is. Most practices find thousands in collectible revenue they didn't know was there. No obligation — just a clear picture of what's sitting in your AR.