Accounts receivable in medical billing is the money a practice has recorded as due but has not yet collected or resolved. It can include balances expected from insurance payers, patients, secondary coverage, employers, government programs, or other responsible parties.
A/R is not simply a list of unpaid claims. It also contains claims waiting for adjudication, rejected claims, denied services, underpayments, patient responsibility, unapplied payments, credits, and accounts that may no longer be collectible.
Good A/R management makes the next action visible. Poor A/R management allows balances to age because everyone assumes “billing is working it.”
How Accounts Receivable Enters the Medical Billing Cycle
An account begins moving toward A/R when a service is documented and charged. It remains unresolved until the practice correctly receives and posts all expected payer and patient amounts or applies an approved adjustment, refund, transfer, or write-off.
The path usually includes:
- Date of service
- Charge entry
- Claim creation
- Clearinghouse and payer acceptance
- Adjudication
- Remittance and payment posting
- Correction, appeal, secondary billing, or patient billing
- Final payment or approved resolution
Delays early in the cycle can be invisible in a traditional A/R report. An encounter with no charge or a charge with no claim may not appear in insurance A/R at all. That is why the practice also needs appointment-to-charge and charge-to-claim reconciliation.
Insurance A/R vs. Patient A/R
Insurance A/R
This includes claims or balances expected from a health plan or other payer. Common states include:
- Submitted and awaiting adjudication
- Rejected before adjudication
- Additional information requested
- Denied and actionable
- Appeal pending
- Secondary claim pending
- Payment issued but not posted
- Paid below expected amount
Patient A/R
This includes deductible, copay, coinsurance, non-covered services, self-pay balances, payment plans, and other valid patient responsibility.
Do not transfer a balance to the patient simply because the payer did not pay. Confirm the remittance, contract, notice requirements, authorization facts, and applicable law first.
Credits and unapplied cash
Negative balances and unidentified payments are part of A/R control even though they are not collectible debt. They can indicate duplicate payment, posting error, refund liability, or cash that has not been matched to an account.
What Is an A/R Aging Report?
An A/R aging report groups outstanding balances by age. Common buckets are:
- 0–30 days
- 31–60 days
- 61–90 days
- 91–120 days
- More than 120 days
The aging date may be based on date of service, charge entry, claim submission, first bill, or another system rule. Know which one your report uses.
Review the distribution, not only the total. A practice can keep total A/R flat while current accounts shrink and old, less collectible balances grow.
Segment aging by:
- Payer
- Patient vs. insurance responsibility
- Provider and location
- Service or specialty
- Denial category
- Claim status
- Balance size
- Owner and next action
How to Calculate Days in A/R
Days in A/R estimates how many days of average revenue are tied up in outstanding accounts.
Days in A/R = total accounts receivable ÷ average daily net patient service revenue
One common approach to average daily revenue is:
Average daily net revenue = net patient service revenue for the period ÷ days in the period
Use a consistent period and written exclusions. Practices may exclude credit balances, capitation, non-patient revenue, or accounts formally classified as non-collectible. The exact method matters less than applying the same defensible definition over time.
Days in A/R is a directional measure, not a complete diagnosis. It can improve because volume rose, because old accounts were written off, or because a large payment arrived. Pair it with aging, denial inventory, charge lag, and collection measures.
Other A/R Metrics Practice Owners Should Watch
Percentage of A/R over 90 or 120 days
Old A/R percentage = balance above the selected age ÷ total positive A/R
Choose a threshold appropriate to the payer mix and use it consistently.
Claim submission lag
Measure date of service to payer-accepted claim, not only date of service to transmission. Rejected claims are not safely progressing toward payment.
No-response claims
Count claims with no payer acknowledgment, status, remittance, or documented follow-up after the expected period.
Denial inventory
Track denied dollars and accounts by age, reason, deadline, next action, and owner. Use the denial management guide to separate correction, appeal, and prevention work.
Net collection rate
Compare collected amounts with collectible allowed amounts after contractual adjustments. Define the calculation and treatment of refunds, credits, and timing in writing.
Payment variance
Compare actual allowed and paid amounts with contract or fee-schedule expectations. A paid claim can remain financially unresolved.
Patient balance cycle time
Measure adjudication to first accurate patient statement and first statement to resolution. Delayed patient billing makes both communication and collection harder.
See the broader medical practice KPI guide for a full dashboard.
Why Medical A/R Ages
Charges are late or missing
Unsigned notes, unclosed encounters, missing superbills, interfaces, and manual handoffs prevent claims from being created.
For practices that need a consistent charge-capture worksheet, the free superbill template and generator provides printable diagnosis, service, modifier, unit, and charge fields. Treat it as a source document, not a claim or coding recommendation.
Claims are rejected
The practice transmitted the claim, but a clearinghouse or payer edit stopped it before adjudication. Without a daily rejection queue, the staff may believe it is pending.
The payer requested information
A claim can wait for records, an invoice, a corrected identifier, other-payer information, or another attachment. If the request lands in a fax inbox or portal, A/R continues aging without a visible denial.
Denials lack ownership
The biller waits for clinical notes; clinical staff assumes billing is appealing; the deadline passes between them.
Secondary claims do not cross over
The primary payer adjudicates, but the secondary claim fails to transmit or lacks the primary remittance details.
Payments do not post correctly
The payer paid, but the ERA did not load, the EFT was not reconciled, or cash remains unapplied.
Patient balances begin too late
The practice delays statements, uses incorrect addresses, or transfers a disputed payer balance without resolving the cause.
The work queue is sorted only by balance
High-dollar prioritization can ignore easy recoveries, imminent deadlines, repeat payer failures, or small balances that consume large aggregate staff time.
A Better Way to Prioritize A/R
Every account should have a current status, next action, owner, and deadline. Prioritize using a combination of:
- Filing or appeal deadline
- Balance
- Account age
- Expected reimbursement
- Probability of recovery
- Staff time required
- Patient impact
- Repeat frequency
- Payer or contract significance
A useful daily queue might include:
- Deadlines within 14 days
- Rejections and no-acknowledgment claims
- Payer requests for information
- Approved claims awaiting payment
- High-value actionable denials
- Underpayments
- Secondary claims
- Patient balance exceptions
- Routine follow-up due today
This is more effective than opening the oldest account and working down the report.
The Weekly A/R Workflow
Daily controls
- Reconcile completed visits to charges
- Reconcile transmitted claims to acknowledgments
- Correct front-end rejections
- Post remittances and reconcile deposits
- Route new denials and information requests
- Escalate deadlines and patient-impact cases
Weekly controls
- Review no-response claims by payer
- Work aged claims due for follow-up
- Review underpayments and unexpected adjustments
- Resolve secondary-billing failures
- Audit missing charges and unapplied cash
- Review patient-balance exceptions
Monthly controls
- Compare aging and days in A/R with the prior periods
- Review denial and recovery trends
- Sample paid claims for contract accuracy
- Review credits, refunds, and write-offs
- Identify one upstream cause to fix
- Confirm access and backup coverage for critical queues
Timely Filing Is a Deadline, Not an A/R Strategy
Payers set limits for original claims, corrected claims, reconsiderations, and appeals. Internal deadlines should be substantially earlier.
For Medicare fee-for-service, CMS generally denies claims received more than 12 months or one calendar year after the date of service, subject to limited exceptions. CMS also explains that an untimely-filing denial generally is not an initial determination subject to appeal. (Medicare Claims Processing Manual, Chapter 1)
Commercial and Medicaid deadlines vary by contract, plan, state, action type, and claim status. Record the source and deadline on the account. Do not rely on one payer-level number in a spreadsheet.
Waiting until a claim approaches timely filing is not active A/R management. By then, records are harder to find, staff may have changed, and the payer may have issued multiple requests the practice missed.
How Eligibility and Prior Authorization Affect A/R
Many old accounts begin before the visit.
- Incorrect coverage creates wrong-payer and coordination-of-benefits work
- Missing benefits create unexpected patient balances
- Unchecked authorization requirements create preventable denials
- Mismatched authorization details create post-service disputes
Use the eligibility verification guide and prior authorization turnaround guide to improve the front end of the cycle rather than adding more follow-up labor later.
Should You Outsource Old A/R?
An outside team can add temporary capacity, but define the inventory first.
Before outsourcing:
- Separate collectible accounts from credits, duplicates, and approved adjustments
- Identify deadlines
- Segment payer, patient, denial, and underpayment work
- Export claim notes, remittances, documentation, and prior actions
- Define vendor authority
- Set fees based on clearly defined recoveries
- Require claim-level status and final disposition data
- Prevent the same causes in current claims
Old-A/R recovery without upstream correction creates a recurring cleanup project. Read the medical billing outsourcing guide before transferring the queue.
A 30-Day A/R Cleanup Plan
Week 1: Reconcile
Confirm that visits became charges, charges became accepted claims, remittances match deposits, and credits are separated from positive A/R.
Week 2: Segment
Group accounts by payer, age, status, reason, deadline, balance, and next action. Remove vague “pending” labels.
Week 3: Work the highest-value actions
Protect deadlines first. Then address quick corrections, missing acknowledgments, payer information requests, approved-but-unpaid claims, and high-value disputes.
Week 4: Fix one cause
Choose the recurring failure producing the most preventable A/R. Assign an owner, standardize the workflow, and measure the next 30 days.
The Bottom Line
Accounts receivable is not healthy merely because someone is making follow-up calls. Healthy A/R has complete upstream reconciliation, accurate statuses, visible deadlines, assigned next actions, and a feedback loop that prevents repeat work.
Use aging and days in A/R to see the trend, then investigate the accounts and workflows underneath them. The goal is not to make the report smaller through indiscriminate write-offs. It is to resolve every balance correctly and sooner.
Greenlight Medical helps private practices find the handoffs that create old A/R and automate repetitive payer-status work without hiding financial decisions. Book a free practice operations audit to identify the first queue worth fixing.
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