Days in AR is the metric that tells you how long it takes your practice to collect money after services are rendered. Industry benchmark is under 35 days. Best-in-class is under 30. Most practices with a billing problem sit between 45 and 65 days — and don’t know what’s driving it.
Reducing days in AR isn’t about working harder on collections. It’s about identifying which specific stage in the revenue cycle is creating the delay — and fixing that stage. Most practices have one or two specific problems, not a general billing failure.
How to Calculate Your Days in AR
Formula: Total AR Outstanding ÷ (Total Charges in Last 90 Days ÷ 90)
Example: $180,000 outstanding AR ÷ ($540,000 charges in 90 days ÷ 90) = $180,000 ÷ $6,000 = 30 days in AR
Run this calculation monthly. If it’s trending up — even slightly — something in your revenue cycle is slowing down. Find it before it compounds.
The 5 Causes of High Days in AR (And How to Fix Each One)
Cause 1: Slow Claim Submission
What it looks like: 0–30 day AR bucket is smaller than 60% of total AR. Charges are sitting in “ready to submit” status for more than 2 days after service.
Root cause: Charge entry lag — documentation isn’t being coded and submitted within 24–48 hours of the encounter. In EHR systems, this often means the provider is signing notes late, which delays charge capture, which delays submission.
Fix: Set a hard policy: all charges submitted within 48 hours of service. Track charge entry lag weekly — average days from service date to submission date. If it’s above 3 days, the problem is in charge entry, not billing.
Cause 2: Denial Follow-Up Lag
What it looks like: 31–60 day bucket growing. Denial rate above 8%. Same denial codes appearing month after month.
Root cause: Denials are being logged but not worked. The biller is submitting new claims but not going back to work the denied ones. Or denial follow-up is happening but without systematic root cause correction — the same denial code keeps appearing because the underlying error hasn’t been fixed.
Fix: Denial follow-up must happen within 5 business days of receipt. Every denial over $500 gets a personal appeal — not just a resubmission. Denial codes that appear more than 3 times in a month get a root cause analysis and a workflow fix, not just an appeal.
Cause 3: Payer Response Time Variation
What it looks like: Days in AR is high but denial rate is low. Some payers are consistently taking 45–60 days to process claims that should pay in 30.
Root cause: Some payers — particularly Medicare Advantage plans and certain commercial insurers — have claim-level editing requirements that delay processing without generating an outright denial. The claim is “in process” but not moving.
Fix: Track days to payment by payer. Any payer averaging over 35 days triggers a follow-up call at day 30 — not day 45. Payer-specific follow-up cadences cut processing time significantly for chronic slow-pay payers.
Cause 4: Patient Balance Accumulation
What it looks like: 60–90+ day bucket growing with a mix of insurance and patient balances. Patient portion of outstanding AR increasing month over month.
Root cause: Patient balances are being billed once and then sitting. Statement cycles are infrequent, patient follow-up is manual and inconsistent, and copay/deductible collection at the time of service is weak.
Fix: Collect patient portions at time of service using eligibility-verified estimates. Patient balances over 30 days get a second statement plus a phone call. Balances over 60 days go to a defined collection protocol — not into a growing pile.
Cause 5: Prior Authorization Disruptions
What it looks like: Specific procedure types or specialty services showing disproportionately high days in AR. High-value claims sitting in 60–90 day bucket.
Root cause: Services rendered without valid prior authorization are billed and denied, then require a retrospective auth process that takes 45–90 days to resolve. Each one sits in AR the entire time.
Fix: Retrospective auth on denied high-value claims — expedite these immediately. Prospective auth workflow must catch expirations before services are rendered, not after.
The Daily AR Workflow That Keeps Days Under 30
The practices that hold days in AR under 30 run a daily workflow, not a monthly one:
| Daily Task | Time Required | What It Prevents |
|---|---|---|
| Review all claims over 25 days with no response — follow up immediately | 15–30 min | Claims aging past 45 days unworked |
| Work yesterday’s denial queue — every denial gets an action, not a flag | 30–60 min | Denial backlog accumulating |
| Flag any auth expiring within 10 days — initiate renewal | 5–10 min | Service rendered without valid auth |
| Verify charges submitted for all services rendered 2+ days ago | 5 min | Charge entry lag |
This is 60–120 minutes of daily active AR management — not claim submission, but the follow-up work that keeps money moving. Most billing problems come from this work being done weekly instead of daily, or monthly instead of weekly.
What Benchmark Days in AR Looks Like by Specialty
| Specialty | Average Days in AR | Best-in-Class |
|---|---|---|
| Family Practice / Primary Care | 28–38 days | Under 25 days |
| Mental Health / Behavioral Health | 32–45 days | Under 30 days |
| Physical Therapy | 30–42 days | Under 28 days |
| Cardiology | 35–50 days | Under 32 days |
| Neurology | 40–60 days | Under 38 days |
| EMS / Ambulance | 45–75 days | Under 40 days |
| Oncology | 40–65 days | Under 38 days |
Frequently Asked Questions
What is a good days in AR for a medical practice?
Under 35 days is within industry benchmark. Under 30 days is best-in-class. Above 45 days indicates systematic revenue cycle problems — usually in denial follow-up, charge submission lag, or prior authorization management — that are compounding monthly.
How do you reduce days in AR quickly?
Fastest impact: immediately work every open claim over 30 days in the current AR. Prioritize timely filing — any claim approaching the filing deadline gets submitted or appealed today. Fix the top denial code causing the most volume — one root cause fix can drop days in AR by 5–10 days within a billing cycle.
What causes days in AR to increase?
Five primary causes: slow charge submission (over 48 hours from service), denial follow-up lag (denials sitting unworked), slow-pay payer patterns not being actively managed, patient balance accumulation, and prior authorization disruptions on high-value services.
Days in AR above 40? Book a free call — we’ll identify the root cause from your AR data before you commit to anything.
Related Resources
How to reduce medical billing denials | What 90-day AR actually costs your practice | How to audit your billing performance | The 7 KPIs to track monthly