What Is AR in Medical Billing?
Accounts receivable is the money your practice has earned but not yet collected. This guide explains how AR works, how it ages, and the follow-up discipline that turns it into cash.
Accounts receivable (AR) is the money a healthcare provider is owed for services already delivered but not yet paid. From the moment a claim is submitted until its balance reaches zero, that money sits in AR. How quickly and completely it comes out of AR decides whether a practice thrives or struggles — which is why AR management is the heartbeat of medical billing.
How money enters and leaves AR
A charge enters AR when the claim is generated. It leaves AR in one of four ways: the payer pays it, a denied claim is successfully appealed and paid, a contractual adjustment writes off the difference between the charge and the allowed amount, or the balance transfers to the patient (deductible, coinsurance, or a non-covered service). Anything still open after those paths is an unresolved balance — and unresolved balances age.
AR aging buckets
| Bucket | Meaning | Healthy signal |
|---|---|---|
| 0–30 days | Fresh claims working through payers | The largest share of total AR — normal |
| 31–60 days | Slow payers and first denials appear | Follow-up should already be active |
| 61–90 days | Problem claims concentrating | Keep this bucket small and shrinking |
| 91–120 days | Likely denials, missing information or payer issues | Needs senior-level work and appeals |
| 120+ days | At risk of timely-filing expiry and write-offs | Ideally under 10–15% of total AR |
The older a balance gets, the less likely it is ever to be collected — which is why disciplined practices work AR from oldest to newest within each priority tier. The companion metric is covered in our days in AR guide.
The AR follow-up process
- Prioritize: sort the aging report by payer, balance size and age; high-dollar and oldest claims first.
- Check status: verify each claim's status on the payer portal or clearinghouse — paid, in process, denied, or never received.
- Call the payer when the portal is not conclusive: confirm the receipt date, denial reason, appeal rights and the exact correction needed. Document the representative's name, the reference number and the date.
- Act: correct and resubmit, attach records, file the appeal, or rebill the correct payer — the same day the information is gathered.
- Document and diary: write a clear account note (what was found, what was done, what happens next) and set the next follow-up date so nothing drifts.
For the deeper workflow — worklists, call discipline and escalation rules — see AR follow-up strategies that actually work.
Who works AR? The key roles
- AR caller / AR executive: checks statuses, calls payers and documents outcomes.
- AR analyst: studies aging patterns, finds root causes (a payer, a code, a location) and designs fixes.
- Denial specialist: works the denied subset — corrections, reconsiderations and appeals.
- Payment poster: posts payments and adjustments accurately so AR reflects reality; posting errors are a hidden cause of phantom AR.
AR metrics to watch
- Days in AR — the headline speed metric.
- AR over 90/120 days (%) — how much of your money is stuck in the danger zone.
- Denial rate and first-pass resolution rate — how much AR is created by preventable errors.
- Collection rate — of what should be collected, how much actually arrives.
AR is not a back-office report — it is the practice's cash pipeline. Elite Bill Care's AR follow-up team works aging reports daily under exactly this discipline. New to the whole cycle? Start with the medical billing process step by step.