Key Takeaways
- An AR aging report sorts every unpaid balance by age: 0-30, 31-60, 61-90, 91-120, and 120+ days. Each bucket demands different follow-up.
- Healthy AR keeps under 40 days in AR (HFMA benchmark) and under 15-20% of balances over 90 days old.
- Prioritize with three factors: claim value, likelihood of recovery, and days left before the timely filing deadline.
- Run AR as a weekly worklist, not a monthly report review. Claims worked at day 35 recover far more often than claims worked at day 95.
- AR over 90 days with no documented follow-up is the clearest signal you need outside help.
Most revenue a practice loses does not vanish in a dramatic denial. It bleeds out quietly in accounts receivable: claims nobody followed up on, balances nobody prioritized, deadlines nobody watched. The AR aging report is the instrument panel that shows this happening in real time. This guide teaches you to read it like a biller, not like an accountant, and to turn it into a weekly worklist that actually recovers money.
What the AR Aging Report Is (and How to Read It)
Accounts receivable in medical billing is money your practice has earned but not yet collected: unpaid insurance claims, patient balances, denied claims awaiting appeal, and payments that came in lower than the contracted rate.
The AR aging report organizes every outstanding balance by how long it has been unpaid, in standard buckets:
| Bucket | Typical share of total AR (benchmark) |
|---|---|
| 0-30 days | 50-65% |
| 31-60 days | 15-25% |
| 61-90 days | 10-15% |
| Over 90 days | Under 15-20% |
Bucket distribution benchmarks from published RCM industry guides, verified October 2026. An old AAPC rule of thumb runs even tighter: 50% / 25% / 15% / 10% across the buckets, with nothing over 120 days as the ideal.
Reading the report means asking three questions, in order:
- How much is in each bucket? Compare against the benchmark shares above. A practice with 35% of AR over 90 days has a follow-up problem, not a payer problem.
- What is it? Insurance claims, patient balances, and denied claims need completely different follow-up. A blended total hides this.
- What is the deadline? Every claim carries a timely filing limit. A $2,000 claim at day 100 with a 120-day filing limit is an emergency. The same claim at day 100 with a 365-day limit is routine.
The total AR balance alone tells you almost nothing. The distribution across buckets, types, and deadlines tells you everything.
The Aging Buckets and What Each One Demands
The buckets are not just labels. Each one calls for a different action, and the follow-up should get more aggressive as claims age.
| Bucket | What it usually means | What to do |
|---|---|---|
| 0-30 days | Normal payer processing time | Confirm the claim was accepted by the clearinghouse and the payer. Fix rejections the same week they appear. No phone calls needed yet. |
| 31-60 days | Past the normal payment window | Check claim status in the payer portal. If there is no record, resubmit. If it is pended, find out what the payer is waiting for. |
| 61-90 days | Something is wrong | Call the payer. Document the representative’s name and reference number. Request reprocessing. Check the timely filing deadline and calendar it. |
| 91-120 days | At serious risk | Escalate to your most experienced AR staff. Verify the filing deadline has not passed. Initiate formal appeals where applicable. Flag for write-off review if truly uncollectible. |
| 120+ days | Recovery unlikely without intervention | Work oldest and largest first. Every deadline is now critical. This bucket is where outside AR recovery help earns its fee. |
The key discipline: the follow-up cadence changes at each threshold. A claim at day 20 needs a five-minute acceptance check. A claim at day 75 needs a phone call today.
The Prioritization Matrix: What to Work First
Nobody has time to work every claim every week. The practices that recover the most revenue work the right claims first. Score each open balance on three factors:
- Value. Higher balances first. A $4,000 claim deserves attention before a $40 claim.
- Recoverability. A clean claim pended for a missing attachment is highly recoverable. A claim denied for timely filing with no appeal rights is not. Do not spend hours on unrecoverable balances while recoverable ones age.
- Deadline pressure. Days remaining before the timely filing or appeal deadline. A claim with 15 days left outranks a claim with 200 days left, regardless of value.
In practice, the weekly worklist sorts like this:
| Priority | Profile | Action this week |
|---|---|---|
| 1 – Urgent | High value, recoverable, deadline under 30 days | Work first. Call the payer, resolve, document. |
| 2 – High | High value, recoverable, no near deadline | Work second. Standard follow-up cadence. |
| 3 – Routine | Low value, recoverable | Batch these. Portal checks, not phone calls. |
| 4 – Review | Any value, low recoverability | Decide: appeal, write off with documentation, or send to recovery. Do not let these sit. |
This matrix is the difference between “working AR” and actually recovering revenue. Most practices work claims oldest-first or biggest-first. Both are worse than deadline-weighted prioritization, because a missed filing deadline turns a recoverable claim into a guaranteed write-off.
The Weekly AR Worklist Cadence
AR management fails when it is a monthly report review. It works when it is a weekly discipline. Here is the cadence:
Monday: Pull and prioritize. Run the aging report. Sort by the prioritization matrix. Assign the week’s worklist: urgent claims to senior staff, routine claims batched for portal checks.
Tuesday-Wednesday: Work the phones. Payer calls for the 61+ day buckets. Document every call: representative name, reference number, what was promised, and the callback date. A call without documentation did not happen.
Thursday: Clean up. Resubmit corrected claims, file appeals with deadlines inside 30 days, post ERAs, and reconcile what came back.
Friday: Review and measure. How many claims moved out of the 90+ bucket? What is the new days-in-AR? Which denials revealed an upstream problem (eligibility, coding, prior auth) to fix so next month’s AR is cleaner?
Two rules make this work: no claim sits in the 61-90 bucket for two consecutive weeks without a documented payer contact, and the worklist is rebuilt from the report every Monday, not carried over on autopilot.
For the full picture of where AR fits in your cash flow, see our guide to revenue cycle management.
When AR Over 90 Days Needs Outside Help
Some AR problems are staffing problems, and staffing problems do not fix themselves. Bring in outside AR recovery help when you see these signs:
- Over 20% of AR is older than 90 days, and the number is not shrinking month over month.
- No documented follow-up exists on claims in the 90+ bucket. If nobody can show a call log, the work is not happening.
- Timely filing deadlines are being missed. Every missed deadline is revenue that can never come back.
- Your biller is also doing charge entry, posting, and credentialing. AR follow-up loses to urgent daily tasks every time. It needs dedicated ownership.
- Inherited AR from a prior billing company is sitting untouched. Old AR needs a dedicated cleanup project, not spare-minutes attention.
Outside help works best as a defined project: clean up the 90+ bucket, document what was recovered and what was written off (and why), and hand back a clean report with the weekly cadence running.
Recovery Realities by Age Bracket
The longer a claim sits, the less likely it pays. The table below is illustrative, not a published benchmark – your payer mix, specialty, and follow-up discipline move these numbers. But the shape of the curve is universal: recovery probability falls off a cliff after 90 days.
| Age bracket | Illustrative recovery likelihood | Why it drops |
|---|---|---|
| 0-30 days | Very high (90%+) | Normal processing; most pay without intervention |
| 31-60 days | High (80-90%) | Usually a fixable issue: status check, resubmission |
| 61-90 days | Moderate (60-75%) | Requires calls and escalation; deadlines approaching |
| 91-120 days | Low (40-55%) | Many need formal appeals; some deadlines already at risk |
| 120+ days | Very low (under 40%) | Often requires appeal rights that may have expired |
Illustrative figures for planning purposes. The takeaway is directional: every week a claim ages without action, its expected value drops. That is the entire economic case for the weekly worklist.
Benchmarks: Is Your AR Healthy?
Three numbers tell you whether your AR is under control:
1. Days in AR. The average days from service to payment. Formula:
Days in AR = Total AR / Average Daily Charges
Example: $450,000 in total AR / $12,500 average daily charges = 36 days. The HFMA benchmark is under 40 days. Over 50 days signals a follow-up or submission problem worth investigating.
2. Percentage of AR over 90 days. Keep it under 15-20%. Above that, you have a systematic follow-up gap.
3. Net collection rate. What you collected versus what you were contractually owed. Healthy practices collect 95-99% of allowed amounts. Below 90% means underpayments or write-offs are eating revenue silently.
If your numbers miss these benchmarks, the problem is rarely mysterious. It is usually one of four things: slow claim submission, weak denial follow-up, no weekly AR cadence, or patient balances nobody works. Fix them in that order.
Our medical billing services include systematic AR follow-up built around these exact benchmarks, not just claim submission.
Frequently Asked Questions
What is an AR aging report in medical billing?
An AR aging report lists every unpaid balance your practice is owed, sorted by how long it has been outstanding: 0-30, 31-60, 61-90, 91-120, and 120+ days. It separates insurance claims from patient balances and is the primary tool for prioritizing follow-up.
What is a good days in AR for a medical practice?
Under 40 days, per the HFMA benchmark. Under 30 is excellent. Over 50 days indicates problems with claim submission speed, denial rates, or follow-up discipline. Targets vary slightly by specialty.
How much of my AR should be over 90 days?
Less than 15-20% of total AR. More than that signals that follow-up is not keeping pace with aging, and a growing share of that balance is at risk of becoming uncollectible.
What is the difference between insurance AR and patient AR?
Insurance AR is money owed by payers on submitted claims; follow-up means portal checks, phone calls, and appeals. Patient AR is money owed by patients (copays, deductibles, coinsurance); follow-up means statements, payment plans, and collection workflows. They need different staff skills and different cadences.
When should I write off old AR?
Only after documented follow-up attempts, a confirmed deadline expiry or final denial with no appeal rights, and a recorded reason. Write-offs without documentation hide process failures. Track write-off reasons – patterns there point to upstream fixes in eligibility, coding, or prior authorization.
Can outsourced billing fix my AR problem?
If the problem is systematic follow-up, yes: a dedicated AR team working a weekly cadence against the aging report recovers significantly more than spare-minutes attention from overloaded in-house staff. If the problem is upstream (bad eligibility checks, coding errors), the AR team should flag it, but the fix happens before the claim is created. Our guide to medical billing and coding services covers the full cycle.
Want to know what your AR report is really telling you? Our free billing audit analyzes your aging buckets, days in AR, and denial patterns, and shows exactly where recoverable revenue is sitting. Request your free audit.
