How do you recover old or aged accounts receivable at a treatment center?

What counts as “aged” AR at a treatment center?

Accounts receivable is “aged” once a claim sits unpaid past the point it should have resolved. It is tracked in an aging report that sorts every open balance into buckets by how long it has been outstanding — typically 0–30, 31–60, 61–90, 91–120, and 120-plus days — measured from the date you billed. Days in AR is the related summary figure: roughly how long, on average, a dollar waits before you collect it.

The number that tells you whether you have a problem is not a single benchmark — it is how much of your balance is stuck in the older buckets and why. AR that is young and moving is normal; AR piling up past 90 and 120 days is where claims quietly cross filing and appeal deadlines and become write-offs. Per-diem behavioral health programs generate a high volume of claims, so AR can build fast when anything in the workflow stalls.

Be skeptical of generic targets. There is no clean, behavioral-health-specific public benchmark for days in AR, and a facility heavy in residential per-diem claims will not look like an outpatient practice — we walk through what the credible numbers actually are in normal denial, days-in-AR, and clean-claim benchmarks for a behavioral health facility. Judge your own trend over time and the shape of your buckets rather than a borrowed number, and treat the percentage of AR sitting past 90 days as the practical health signal.

Is old AR still recoverable, or should you just write it off?

Much of it is recoverable, and writing off by age leaves money on the table. What decides recoverability is why a claim aged and how much filing or appeal window is left — not the number of days on the report. Some old AR genuinely is gone; a lot of it was never actually worked.

The economics of abandonment are the whole story. Industry analyses citing AHIMA Journal data estimate that 35% to 60% of denied or returned claims are never resubmitted, and that reworking a single denied claim costs roughly $25 to $181 — real labor that a busy in-house team triages last. The appeal gap is just as wide: in KFF’s analysis of 2024 HealthCare.gov data, insurers denied about 19% of in-network claims, yet consumers appealed fewer than 1%.

Recoverable is not the same as automatic, though, and the honest framing matters on money. The same KFF data found that 66% of internal appeals upheld the original denial — so working aged AR is about finding the winnable claims and documenting them, not assuming every old balance pays. Claims past every deadline, with no exception and no proof of timely filing, are write-offs. The point is to triage what is left, not to write off the whole report by age.

Why does AR age at behavioral health facilities specifically?

For structural reasons — the same authorization and medical-necessity burden that makes behavioral health claims get denied also makes them age. Continued-stay reviews, per-diem claim volume, carve-out payers, and eligibility errors at admission each create claims that stall before they are paid.

The recurring drivers are predictable once you have seen them repeat. A continued-stay or concurrent review denial can freeze days of an authorized stay while the appeal is worked. The behavioral health carve-out — when a separate managed behavioral health organization administers the benefit under its own payer ID, filing address, and clock — produces claims that sit because they went to the wrong entity. Eligibility and benefits (VOB) errors at the front door do not surface until the claim is already old. And because denials compete with daily claim submission, they get triaged last and age out.

That is why aged AR and denials are the same problem viewed at different stages: most aged AR is unworked denials and no-response claims that nobody had time to chase. The end-to-end mechanics of working those denials are covered in how behavioral health facilities recover denied claims.

How do you recover aged AR, step by step?

Recovery is a process, not a mass resubmission. The work runs in five steps: pull the full aging report; segment it by payer, age, dollar, and status; check each claim’s remaining filing and appeal windows; reconcile the no-response claims separately from the denials; then work each — follow-up and corrected resubmission for one, a documented appeal for the other — escalating through peer-to-peer, internal appeal levels, and external review when the first pass fails.

The distinction that decides the path is status. A no-response (pending) claim is not a denial: the payer never adjudicated it, there is no remittance, and the fix is to follow up or correct and resubmit — while the timely-filing clock is usually still running. A denial was adjudicated: it carries a remittance with CARC and RARC codes, and it requires an appeal, not a resubmission. Resubmitting a true denial just restarts the same outcome and burns days you may not have.

Protect the window at every step. A claim’s filing deadline varies by payer — Medicare sets a one-calendar-year limit in the CMS Medicare Claims Processing Manual, Chapter 1, while commercial and Medicaid deadlines are set by contract and state — and a denial starts a separate, usually shorter clock for the appeal itself. Whether a claim already past the deadline can still be recovered is its own question, answered more often with “yes” than facilities assume; we cover it in recovering a behavioral health claim past the timely filing deadline. One more place money hides: underpayments. A claim paid below the contracted rate looks closed on the report but is still recoverable.

Which aged claims should you work first?

Work by remaining window, recoverability, and dollar value — not oldest-first. The best early targets are high-dollar per-diem claims (PHP and residential), anything with a closing filing or appeal deadline, clean administrative denials you can win with a document, and no-response claims still inside the timely-filing window. Chasing every balance by age wastes the time the winnable ones need.

Sort the report by what the claim turns on. Administrative denials — timely filing, eligibility, coordination of benefits, registration errors — are won by proving a fact with a document, which makes them some of the more winnable balances to clear quickly. Medical-necessity and continued-stay denials take more clinical work and time, so they need the window most. The oldest claims are not automatically the priority; a 45-day claim with a deadline next week outranks a 200-day claim with months of appeal window left.

This triage — which past-due and denied claims are still worth working, and which are gone — is exactly what a free aging-report teardown produces: a straight read on your own aging report, by payer and dollar, rather than a generic benchmark.

Should you recover aged AR in-house or hire a specialist?

It depends on whether your team has the time and the behavioral-health-specific payer knowledge to work old claims before their windows close. In-house keeps control but competes with daily billing, so aged AR is triaged last and ages further. A specialist adds capacity and payer-pattern knowledge but adds cost — unless the work is priced on contingency.

For aged AR specifically, a contingency model — paid only on what is actually collected — removes most of the downside, because the recovery is paid out of money that was otherwise going to be written off. The practical test is simple: can the people working your old claims name how your specific payers behave on concurrent review, level-of-care, and carve-out denials? If your aging report is a learning project for them, the recoverable claims will keep aging while they learn the payers you already know.

Key takeaways

• Aged does not mean lost: recoverability is decided by why a claim aged and how much window is left, not by the number of days.
• There is no clean BH-specific days-in-AR benchmark — judge your own trend and how much AR sits past 90 days, not a borrowed number.
• A no-response claim was never adjudicated (follow up or resubmit); a denial was (appeal it). Reading the remittance tells you which.
• Recovery is a process: pull the aging report, segment by payer/ age/dollar/status, check the windows, then work and escalate.
• Prioritize by remaining window, recoverability, and dollar value — high-dollar per-diem claims and document-winnable administrative denials first, not oldest-first.
• Most aged AR is unworked denials and no-response claims; specialist payer knowledge and contingency pricing are what get them worked before they age out.