AR in medical billing stands for Accounts Receivable. It refers to the money a healthcare provider has earned for services already delivered but has not yet collected from insurance companies, patients, or other payers.
In simple terms, AR is the unpaid revenue sitting between claim submission and final payment. A medical practice may have strong patient volume, but if claims are unpaid, denied, delayed, underpaid, or stuck in follow-up, cash flow can quickly become a problem.
That is why AR management is one of the most important parts of the healthcare revenue cycle. It helps practices collect faster, reduce old unpaid claims, prevent avoidable write-offs, and identify problems in billing, coding, payer follow-up, and patient collections.
What Is Included in AR in Medical Billing?
AR may include balances due from:
- Commercial insurance companies
- Medicare or Medicaid
- Secondary insurance payers
- Workers’ compensation payers
- Patients
- Self-pay accounts
- Other third-party payers
For example, if a physician sees a patient, submits a claim to the insurance company, and has not yet received payment, that unpaid claim becomes part of the practice’s AR.
Not all AR is the same. A new claim that was submitted five days ago is very different from a denied claim that has been unpaid for 120 days. That is why practices review AR by payer, age, dollar value, denial reason, provider, location, and patient responsibility.
Net A/R is not the same as total unpaid charges. It is the amount a practice realistically expects to collect after subtracting amounts such as contractual adjustments, charity care, credit balances, and balances that may not be collectible. HFMA defines Net A/R as the net patient receivable on the balance sheet after these items are considered.
AR vs AP in Medical Billing: What Is the Difference?
AR and AP are both important financial terms, but they mean opposite things.
AR, or Accounts Receivable, is money owed to the medical practice. In medical billing, this usually means unpaid claims from insurance payers or unpaid balances from patients.
AP, or Accounts Payable, is money the medical practice owes to others. Accounts payable usually refers to unpaid bills owed to vendors or suppliers for goods and services the business has already received. AP is generally treated as a current liability on the balance sheet.
In a healthcare practice, AP may include bills for medical supplies, rent, utilities, EHR software, clearinghouse fees, outsourced billing services, equipment leases, laboratory vendors, staffing services, or other operating expenses.
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Simple Example of AR vs AP A cardiology practice submits a $500 claim to an insurance company. Until the payer processes and pays that claim, the $500 is part of the practice’s accounts receivable. The same practice receives a $300 invoice from its medical supply vendor for ECG electrodes. Until the practice pays that invoice, the $300 is part of its accounts payable. So, the simple difference is: AR = money coming in Both affect cash flow. If AR is too high, the practice may not collect revenue fast enough. If AP is unmanaged, the practice may miss vendor payments, damage supplier relationships, or struggle with operating expenses. |
Medical Billing AR Process Step by Step
The AR process begins before the claim is even submitted. A clean AR process depends on accurate front-end work, correct coding, timely claim submission, and consistent follow-up.
A simplified flow looks like this:
Patient registration → insurance verification → authorization → visit → documentation → coding → charge entry → claim submission → payer adjudication → payment/remittance posting → denial follow-up or patient billing → final resolution.
Let’s discuss it in detail for your better understanding:
1- Patient Registration
The practice collects the patient’s demographic information, contact details, insurance information, guarantor details, and billing preferences.
Errors at this stage can cause claim rejections, denials, delayed statements, and patient collection issues.
2- Insurance Verification
The billing or front-desk team verifies whether the patient’s insurance is active and confirms key details such as plan type, benefits, copay, deductible, coinsurance, and coverage limitations.
3- Prior Authorization or Referral Check
Some services require prior authorization, referrals, or medical necessity documentation before the visit or procedure. Missing authorization is one of the most common reasons claims become delayed or denied.
4- Patient Visit and Documentation
The provider performs the service and documents the encounter. Accurate documentation supports correct coding, medical necessity, and payer reimbursement.
5- Medical Coding
The encounter is coded using the appropriate diagnosis codes, procedure codes, modifiers, units, and place-of-service information.
6- Charge Entry
Charges are entered into the billing system. The team checks that all services performed are captured correctly and that no charges are missing.
7- Claim Scrubbing
Before submission, claims should pass billing edits to catch missing information, invalid codes, incorrect modifiers, eligibility issues, or payer-specific requirements.
HFMA defines clean claim rate as the number of claims that pass billing edits without manual correction divided by the total number of claims accepted into the billing system.
Formula
Clean Claim Rate = Claims sent without errors ÷ Total claims × 100
8- Claim Submission
The claim is submitted electronically or on paper, depending on payer requirements. Most professional claims are submitted electronically through a clearinghouse or directly to the payer.
9- Payer Adjudication
The payer reviews the claim and decides whether to pay, deny, partially pay, request more information, or apply the balance to patient responsibility.
10- Payment Posting
Payments, contractual adjustments, denials, and patient responsibility amounts are posted from the payer’s remittance advice.
11- Denial or Rejection Follow-Up
If the claim is rejected or denied, the billing team identifies the reason, corrects the issue, resubmits the claim, sends an appeal, or requests reconsideration.
12- Patient Billing
Once insurance has processed the claim, valid patient responsibility is billed to the patient. The AMA recommends verifying that insurance payments and adjustments are correctly applied before patient statements are generated and sent.
13- Final Resolution
The balance is resolved through payment, adjustment, appeal, transfer to patient responsibility, payment plan, write-off, or collections.
Types of AR in Medical Billing
Different types of AR require different follow-up strategies. A payer claim that needs an appeal should not be worked the same way as a patient balance after insurance processing.
| Type of AR | Meaning | Example |
| Insurance AR | Money pending from an insurance payer | A claim submitted to a commercial payer has not been paid |
| Patient AR | Balance owed by the patient | Deductible, copay, coinsurance, or non-covered service |
| Self-Pay AR | Balance owed by a patient without active insurance | Patient has no coverage for the date of service |
| Billed AR | Claim or statement has already been billed | Claim submitted to insurance or statement sent to patient |
| Unbilled AR | Service exists but has not yet been billed | Coding hold, documentation issue, or charge lag |
| Old AR | Balance aging beyond the normal collection window | Claim older than 90 or 120 days |
| Denied AR | Balance unpaid because payer denied the claim | Authorization missing or medical necessity denied |
| Underpaid AR | Payer paid less than expected | Contracted rate was not paid correctly |
AR Days in Medical Billing
AR days, also called Days in Accounts Receivable, measures how long it takes a practice to collect payment on average.
The basic formula is:
AR Days = Total money you’re waiting to collect ÷ average money you earn per day
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AR Days Example Let’s say a practice has:
First, calculate average daily net revenue: $900,000 ÷ 30 = $30,000 Then calculate AR days: $450,000 ÷ $30,000 = 15 days This means the practice has approximately 15 days of revenue sitting in accounts receivable. |
What Is a Good AR Days Benchmark?
Benchmarks vary by specialty, payer mix, claim complexity, and organization type. However, AAFP says days in A/R should stay below 50 days at minimum, while 30 to 40 days is preferable.
That said, AR days should never be reviewed alone. A practice may have acceptable overall AR days while still having too much money stuck in 90+ or 120+ day balances. AAFP also notes that good overall days in A/R can mask elevated older receivables, making it important to monitor older AR separately.
AR Aging Report in Medical Billing
An AR aging report shows unpaid balances grouped by age. It helps billing teams understand how much money is current, delayed, at risk, or close to becoming uncollectible.
HFMA uses aging categories such as 0–30, 31–60, 61–90, 91–120, and over 120 days for billed A/R, and notes that the aging categories should be mutually exclusive and sum to 100%.
| AR Aging Bucket | What It Usually Means | Recommended Action |
| 0–30 days | Recently billed claim or balance | Monitor payer response and rejection reports |
| 31–60 days | Payment may be delayed | Check claim status and payer response |
| 61–90 days | Risk is increasing | Prioritize follow-up, denial correction, or appeal |
| 91–120 days | High-risk AR | Escalate, review timely filing and appeal deadlines |
| 120+ days | Very high-risk AR | Review for recovery, appeal, patient transfer, write-off, or collections |
A healthy AR report usually has most balances in the newest buckets. If too much AR is sitting in 90+ or 120+ days, the practice may be dealing with claim delays, denials, payer issues, weak follow-up, payment posting delays, or patient collection problems.
Common Reasons AR Increases
AR usually increases when claims are not paid quickly or correctly. The issue may come from the front end, billing department, payer, provider documentation, or patient collection workflow.
Common causes include:
1- Eligibility Errors
Claims may be delayed or denied if the wrong insurance is entered, coverage is inactive, subscriber information is incorrect, or coordination of benefits is not updated.
2- Missing Prior Authorization
Many payers require prior authorization for surgeries, imaging, specialty procedures, medications, and certain office-based services. Missing authorization can lead to denials and lost revenue.
3- Incorrect Patient Demographics
Small errors in name spelling, date of birth, member ID, address, or payer selection can create claim rejections or delays.
4- Coding Errors
Incorrect diagnosis codes, procedure codes, units, modifiers, or place-of-service codes can trigger denials, underpayments, or payer reviews.
5- Incomplete Documentation
If the medical record does not support the billed service, the payer may deny the claim for lack of medical necessity or request additional documentation.
6- Claim Rejections
Rejected claims fail before payer adjudication. These must be corrected and resubmitted quickly because they may never enter the payer’s payment cycle.
7- Claim Denials
HFMA defines a denied claim as one that is received and processed by the health plan but receives a negative determination, causing payment delays, lost revenue, and lower patient satisfaction.
8- Payer Delays
Sometimes AR grows because payers delay processing, request records, pend claims, or process claims incorrectly.
9- Underpayments
A payer may pay less than the contracted amount. Without contract review and underpayment tracking, these balances may go unnoticed.
10- Slow Payment Posting
If payments and adjustments are not posted promptly, AR reports become inaccurate and follow-up teams may waste time working accounts that have already been paid.
11- Weak Patient Collections
Patient balances can grow when statements are delayed, estimates are unclear, payment plans are not managed, or staff do not collect copays and known balances at the time of service.
12- Timely Filing Problems
Medicare’s general rule for services furnished on or after January 1, 2010 is that claims must be filed no later than one calendar year after the date of service, unless an exception applies.
Denials vs Rejections in Medical Billing AR
Denials and rejections are often confused, but they are not the same.
| Term | Meaning | What Happens Next |
| Claim Rejection | The claim fails before payer adjudication because of missing, invalid, or incorrect information | Correct the error and resubmit the claim |
| Claim Denial | The payer receives and processes the claim but refuses full or partial payment | Appeal, correct, reconsider, or write off if appropriate |
A rejection is often a front-end or claim-format issue. A denial is a payer payment decision after review.
For AR teams, this difference matters because rejected claims need fast correction and resubmission, while denied claims may require documentation, medical necessity support, coding review, appeal letters, or payer escalation.
Key AR Metrics Every Practice Should Track
A practice cannot improve AR without measuring it. The right metrics show where revenue is delayed, where denials are increasing, and which payers or workflows need attention.
| Metric | What it means (simple) | Why it matters |
| Days in AR | How many days it takes to get paid | Lower = faster payments |
| AR over 90 days | Money stuck for a long time | High = risk of not getting paid |
| Clean claim rate | Claims sent without errors | Higher = fewer delays |
| Denial rate | Claims that get denied | Lower = fewer problems |
| Collection rate | Money you actually collect | Higher = better revenue |
| Underpayment rate | Claims paid less than expected | Helps find lost revenue |
Remittance denial rate shows how many claims were denied out of all the claims that were processed by the payer.
How to Reduce AR Days in Medical Billing
Reducing AR days requires both prevention and follow-up. The goal is not just to work old claims faster. The goal is to stop preventable AR from building in the first place.
1- Verify Insurance Before Every Visit
Eligibility should be verified before the patient is seen. Confirm active coverage, payer, plan, deductible, copay, coinsurance, and coordination of benefits.
2- Collect Copays and Known Balances Upfront
Collecting at the time of service is usually easier than collecting after the patient leaves. Staff should be trained to discuss patient responsibility clearly and professionally.
3- Confirm Prior Authorization Requirements
Before scheduled services, verify whether authorization, referral, or medical necessity documentation is required.
4- Submit Claims Daily
Delayed claim submission creates avoidable AR. Charges should be entered, reviewed, and submitted as quickly as possible.
5- Use Claim Scrubbing
Claim edits help catch missing data, invalid codes, payer-specific issues, and formatting problems before claims are sent.
6- Separate Rejections from Denials
Rejections should be corrected quickly because they may not be considered received by the payer. Denials should be categorized by reason and worked through appeal, correction, or reconsideration.
7- Work High-Dollar and Older AR First
Prioritize accounts by age, dollar value, payer deadline, and likelihood of recovery.
8- Track CARC and RARC Codes
Claim Adjustment Reason Codes and Remittance Advice Remark Codes help explain payer adjustments and denials on electronic remittance advice. CAQH CORE notes that CARCs, RARCs, and group codes are used together to convey details about claim adjustments or denials in the X12 835.
9- Appeal Denials Quickly
Appeal deadlines vary by payer. AR teams should document denial dates, appeal deadlines, records sent, payer reference numbers, and next follow-up dates.
10- Review Payer Underpayments
Compare payer payments against contracted rates. Underpayments should be appealed or escalated instead of adjusted off automatically.
11- Post Payments Daily
Payment posting delays can make AR reports inaccurate. Payments, adjustments, denials, and patient responsibility should be posted promptly.
12- Send Patient Statements on a Regular Schedule
Patient statements should be generated consistently after insurance processing is complete. The AMA recommends a regular and frequent schedule for generating and sending patient statements to avoid payment delays.
AR Follow-Up Process in Medical Billing
AR follow-up is the process of reviewing unpaid claims and balances, identifying why payment has not been received, and taking the correct action to resolve the account.
A strong AR follow-up workflow looks like this:
Step 1: Pull the AR Aging Report
Start with a current AR aging report. Break it down by payer, provider, location, specialty, aging bucket, and balance amount.
Step 2: Prioritize Accounts
Work accounts based on:
- Highest dollar value
- Oldest aging bucket
- Timely filing deadline
- Appeal deadline
- Payer behavior
- Denial reason
- Claim status
Step 3: Check Claim Status
Use payer portals, clearinghouse reports, claim status transactions, or payer calls to determine whether the claim is pending, denied, rejected, paid, underpaid, or never received.
Step 4: Identify the Root Cause
Common root causes include eligibility errors, missing authorization, coding issues, documentation gaps, medical necessity denials, payer processing delays, and missing remittance.
Step 5: Take the Correct Action
Depending on the issue, the team may need to:
- Correct and resubmit the claim
- Submit medical records
- Send an appeal
- Request reconsideration
- Rebill secondary insurance
- Transfer balance to patient responsibility
- Escalate to payer representative
- Adjust or write off the balance if appropriate
Step 6: Document Every Action
Each account should include notes showing the action taken, date, payer reference number, expected response time, and next follow-up date.
Step 7: Set a Follow-Up Date
Do not let accounts sit without ownership. Every unresolved account should have a next action date.
Step 8: Review Patterns
If the same denial appears repeatedly, fix the root cause. AR follow-up should not only recover money; it should also prevent future revenue leakage.
Insurance AR vs Patient AR
Insurance AR and patient AR require different strategies.
Insurance AR
Insurance AR involves unpaid balances from payers. These balances often require claim status checks, denial appeals, corrected claims, medical record submission, underpayment review, or payer escalation.
Common insurance AR actions include:
- Checking claim status
- Correcting rejected claims
- Appealing denials
- Reviewing authorization issues
- Submitting medical records
- Following up on pending claims
- Reviewing payer contracts
- Identifying underpayments
Patient AR
Patient AR involves balances owed by patients after insurance processing or self-pay billing. These may include deductibles, copays, coinsurance, non-covered services, or full self-pay balances.
Common patient AR actions include:
- Sending patient statements
- Offering payment plans
- Sending digital payment reminders
- Explaining insurance responsibility
- Collecting balances before future visits
- Following financial assistance policies
- Moving unpaid balances to collections when appropriate
Patient AR should only be billed after payer payments, adjustments, and patient responsibility amounts are posted correctly.
When Should a Practice Outsource AR Management?
A practice may consider outsourcing AR recovery services when unpaid claims are growing faster than the internal team can handle.
Common signs include:
- AR over 90 days is increasing
- Denial rate is rising
- Staff cannot keep up with follow-up
- Claims are missing timely filing deadlines
- Payment posting is delayed
- Patient statements are inconsistent
- Payer underpayments are not being reviewed
- The practice has no clear AR dashboard
- Old AR is being written off without proper review
- Providers are unsure why collections are low despite strong patient volume
Outsourcing can help when a practice needs dedicated AR specialists, payer follow-up, denial recovery, underpayment review, or cleanup of old AR. The best results come when AR recovery and denial prevention work together.
If Your AR Is Falling Behind, It May Be Time for Extra Support
At Manifest Technology Solutions, we help practices stay consistent with their AR work so nothing falls behind.
Our team reviews AR every week instead of waiting until month-end. We track aging, denials, payer delays, and high-value claims so you always know where your money is.
We organize accounts into clear work queues. We group claims by payer, age, balance, and denial reason to keep follow-up focused and efficient.
We keep a close eye on older balances. Claims in 60, 90, and 120+ days get priority so they do not turn into write-offs.
We also track payer performance. When a payer delays payments or increases denials, we catch it early and adjust follow-up.
Instead of fixing the same issues again and again, we identify denial patterns and fix the root cause.
We keep payment posting accurate and up to date so your reports stay clean and reliable.
On the patient side, we make billing simple. We send statements on time and help improve collections without creating confusion.
We also give you clear dashboards so you can track:
- Total AR
- Net AR
- Days in AR
- AR over 90 and 120 days
- Denial rate
- Clean claim rate
- Collection rate
- Underpayment trends
If your AR is growing or follow-up is falling behind, we can help you get it back under control.
Let’s take a look at your AR and see where revenue is getting stuck.
FAQs
1- How often should AR be reviewed in medical billing?
AR should ideally be reviewed weekly, not just at the end of the month. Regular reviews help identify unpaid claims early, prevent aging issues, and ensure timely follow-up before filing or appeal deadlines expire.
2- What is considered high AR in a medical practice?
AR is considered high when a large portion of balances are sitting in 90+ or 120+ day aging buckets. Even if total AR looks manageable, high older AR usually indicates delays in follow-up, denials, or collection inefficiencies.
3- How does AR affect cash flow in healthcare?
AR directly impacts cash flow because it represents revenue that has been earned but not yet collected. If AR is delayed or aging, the practice may struggle to cover expenses like payroll, rent, and vendor payments despite having strong patient volume.
4- What is the difference between gross AR and net AR?
Gross AR is the total amount owed before any adjustments.
Net AR is the amount expected to be collected after subtracting contractual adjustments, write-offs, and uncollectible balances.
Net AR gives a more realistic picture of expected revenue.
5- What are the biggest mistakes that increase AR?
Some of the most common mistakes include:
- Not verifying insurance before the visit
- Missing prior authorizations
- Submitting incomplete or incorrect claims
- Ignoring rejected claims
- Delayed denial follow-up
- Not tracking underpayments
- Poor patient collection processes
These issues can quickly lead to higher AR and revenue loss.
6- How long should a claim stay in AR before follow-up?
Claims should typically be reviewed for follow-up within 7 to 14 days after submission, depending on the payer. Waiting too long increases the risk of delays, denials, or missed filing deadlines.
7- What is AR cleanup in medical billing?
AR cleanup is the process of reviewing and working on old or unresolved claims, usually in the 90+ or 120+ day range. It involves identifying the root cause of non-payment and taking action such as appeals, corrections, or write-offs.
8- What is aging AR vs current AR?
- Current AR includes recently billed claims (usually 0–30 days)
- Aging AR refers to older unpaid balances (60, 90, 120+ days)
A healthy AR has more current balances and minimal aging AR.
9- How do you prioritize AR follow-up work?
AR follow-up is usually prioritized based on:
- Claim age (older first)
- Dollar value (higher amounts first)
- Payer deadlines
- Denial type
- Likelihood of recovery
This helps maximize collections efficiently.
10- What is AR recovery rate?
AR recovery rate measures how much money is successfully collected from previously unpaid or denied claims. A higher recovery rate indicates effective follow-up and denial management.
11- Can AR include denied claims?
Yes, denied claims are part of AR until they are resolved. They remain in accounts receivable until they are:
- Paid after appeal
- Corrected and resubmitted
- Written off if not collectible
12- How does payer mix affect AR?
Different payers process claims at different speeds. A practice with more complex payers or government programs may experience longer AR cycles compared to those with faster-paying commercial insurers.
13- What role does technology play in AR management?
Technology helps improve AR by:
- Automating claim scrubbing
- Tracking denials
- Monitoring AR aging
- Identifying underpayments
- Improving reporting and dashboards
This reduces manual errors and speeds up collections.
14- What is the impact of underpayments on AR?
Underpayments can increase AR because the remaining balance may go unnoticed or unresolved. If not tracked properly, practices may lose revenue even after receiving partial payments.
15- When should AR be written off?
AR should only be written off after:
- All follow-up and appeal options are exhausted
- The balance is confirmed as non-collectible
- The write-off aligns with the practice’s financial policy
Writing off AR too early can result in unnecessary revenue loss.
References:
https://www.hfma.org/wp-content/uploads/2023/07/Revenue-Cycle-Management-2021-mari.pdf
https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/clm104c01.pdf
https://www.ama-assn.org/system/files/revenue-cycle-management-guide.pdf
