Aged AR Cleanup Playbook for Behavioral Health Facilities

You open the AR aging report Monday morning and there it is again: a six-figure column sitting past 90 days, another chunk creeping toward 120, and a handful of claims about to hit timely filing. Your biller says they’re “working it.” The controller wants a number for the board. Somewhere in that pile is real money — money that funds payroll, not a write-off entry.

Aged AR in behavioral health is uniquely painful. Claims sit because a level-of-care authorization was short, because the payer wants a records request nobody saw, or because the original biller left and the trail went cold. This is a playbook for working those buckets before they die.

What it takes to clean up aged AR without leaking cash

• Segment first, chase second. A single “90+” bucket is useless — split by payer, denial reason, and dollar value before touching the phones.
• Timely filing and timely appeals are two different clocks. Most commercial payers give 90–180 days to file and a separate window (often 60–180 days from EOB) to appeal. Miss either and the claim is dead.
• Work highest-dollar, highest-recoverability claims first — not the oldest. Age alone doesn’t predict payment.
• Root-cause every write-off. If you don’t code why a claim died, the same denial will kill the next 40 claims behind it.

Why does behavioral health AR age faster than other specialties?

A residential or PHP claim is not a 99213. It’s a multi-day, multi-service, authorization-dependent bill with concurrent review requirements, level-of-care downgrades mid-stay, and a payer mix that includes out-of-network commercial plans and Medicaid MCOs with wildly different rules. Any one of those can stall a claim for weeks.

The common failure points that show up when auditing aged AR:

• Authorization gaps. A patient stayed 14 days at residential; the payer authorized 10. Days 11–14 sit in AR waiting for a retro-auth that nobody submitted.
• Level-of-care mismatches. The clinical record supports PHP but the claim went out as residential (or vice versa). The payer denies, and the correction never gets rebilled.
• Missing documentation requests. The payer sent a records request to a fax line nobody monitors. Ninety days later, the claim is denied for non-response.
• Coordination of benefits. Secondary payer needs the primary EOB. It never got attached. Claim sits.
• Biller turnover. The person who knew what happened on that account is gone, and the notes say “following up.”

None of these are exotic. All of them are fixable — but only if you work the aging report with a system instead of a checklist.

How do you segment an aged AR bucket before you start working it?

Before anyone picks up a phone, run the aging report through four filters. The goal is to know exactly which claims are worth an hour of a biller’s time and which are already dead.

1. Segment by payer

Group 60/90/120+ day claims by payer category — commercial in-network, commercial out-of-network, Medicaid MCO, Medicare, and self-pay. Each group has different filing windows, appeal rights, and negotiation leverage. An out-of-network commercial claim at 100 days is a very different animal than a Medicaid MCO claim at 100 days.

2. Segment by denial reason

Pull the CARC (Claim Adjustment Reason Code) and RARC codes from the 835s. If 50 claims from one payer are denied with CO-197 (authorization missing), that’s a project — not 50 individual phone calls. Batch the fix.

3. Segment by dollar value

Sort descending. The top 20% of claims by dollar value almost always represent 60–70% of recoverable revenue in an aged bucket. Work those first. A $28,000 residential claim gets your senior biller; a $340 UA claim gets a batch appeal or a write-off decision.

4. Segment by timely filing status

Flag every claim within 30 days of its filing or appeal deadline. Those move to the top of the queue regardless of dollar value, because a claim that expires tomorrow is worth zero tomorrow.

Once the report is segmented, you have a real work plan instead of a wall of numbers.

How do you actually recover 90 and 120+ day claims?

Here’s the sequence that works. It’s phone calls, portals, and paper — but it’s how money comes back.

Step 1: Verify claim status directly with the payer

Don’t trust your billing system’s last status update. Log into the payer portal or call. You’re looking for one of four answers: paid (and posted incorrectly on your side), pending (with a specific reason), denied (with a specific code), or no record of the claim. Each answer routes to a different action.

Step 2: If “no record,” resubmit — but check timely filing first

Claims fall out of clearinghouses more often than people realize. If the payer has no record and you’re still inside the timely filing window, resubmit with proof of original submission (clearinghouse acknowledgment reports). If you’re outside the window, appeal with proof of timely submission — payers will honor this if you have the acknowledgment.

Step 3: If denied, work the appeal, not another rebill

Rebilling a denied claim without addressing the denial reason just resets the clock and often locks you out of appeal rights. Read the denial. If it’s authorization, request a retro-auth with clinical documentation. If it’s medical necessity, appeal with the clinical record and — where relevant — ASAM criteria documentation supporting the level of care.

Step 4: For records requests, respond with a cover letter

Don’t just fax the chart. Include a cover letter that references the claim number, DOS, patient, and exactly what documents are attached and why they support the billed level of care. Payers process organized submissions faster than data dumps.

Step 5: Escalate stuck claims

If a claim has been “in review” for 45+ days past normal turnaround, escalate. Ask for a supervisor. Reference the state prompt-pay statute if applicable (most states have one for commercial claims, typically 30–45 days). File a complaint with the state department of insurance if the payer is out of compliance. This works more often than operators expect.

Step 6: Negotiate on out-of-network aged claims

Some commercial payers will settle aged out-of-network claims at a discount rather than continue appeals. If the alternative is a write-off, a 60% settlement is real money. This is where contracting experience matters — knowing what a payer will actually agree to versus what they’ll stall on.

When should a behavioral health facility write a claim off?

Write-offs are a business decision, not a filing status. A claim gets written off when the cost of continuing to work it exceeds the probability-weighted recovery. Some defensible defaults:

• Past timely filing with no proof of original submission: write off.
• Past appeal deadline with no pending action: write off.
• Under $200 with a denial that requires clinical review: usually write off — the labor cost exceeds the claim.
• Denied for non-covered service with clear policy language: write off, and update your verification of benefits process so it doesn’t happen again.

Every write-off should be coded with a reason. If you’re writing off $80,000 a quarter and 40% of it is “authorization not obtained,” that’s a UR problem, not an AR problem — and it will keep bleeding until upstream gets fixed.

How do you keep aged AR from rebuilding after cleanup?

The cleanup is the easy part. Keeping the report clean is the hard part, because aged AR is a symptom of upstream breakdowns — VOB, authorizations, concurrent review, coding, and posting. If those don’t tighten, you’ll be doing another cleanup in six months.

The controls that actually hold:

• A 30-day touch rule. Every unpaid claim gets a documented action every 30 days. No exceptions. If it hasn’t been touched in 30 days, it goes on a daily escalation list.
• Weekly aging review with the biller and the clinical/UR lead in the same room. Most aged AR problems are cross-functional. Solving them in a billing silo doesn’t work.
• Denial coding at the claim level. Not a summary. Every denial gets a reason code so trends show up.
• A concurrent review process that survives staff turnover. If the only person who knows the auth status is out sick, you have a process problem.

This is where handling the full stack in-house pays off. A denial that traces back to a missed concurrent review isn’t going to get solved by a biller who doesn’t talk to the UR team. At Global AHS, utilization review and billing sit under one roof — the person appealing a medical-necessity denial talks directly to the person who did the concurrent review, not a ticket in a black box.

If you’re staring at an aging report and you’re not sure what’s recoverable, a structured audit will tell you. Global AHS offers a free six-month billing audit that quantifies which aged claims are still workable, which are dead, and where the upstream leaks are. No commitment required to get the number — book the audit here.

Frequently Asked Questions

What’s the timely filing window for most behavioral health claims?

It varies by payer. Commercial plans typically allow 90 to 180 days from date of service; Medicaid MCOs range from 95 to 365 days depending on state and plan; Medicare is 12 months. Appeal windows are separate and usually shorter — often 60 to 180 days from the EOB date. Always check the specific payer’s provider manual, because filing and appeal deadlines are the two clocks that kill aged claims most often.

Should we work the oldest claims first or the highest-dollar claims first?

Highest-dollar with the best recoverability signal, unless a claim is about to hit a filing or appeal deadline. Age alone doesn’t predict payment probability — a clean $22,000 residential claim at 110 days is often more recoverable than a $600 claim at 65 days with a medical-necessity denial. Sort by dollar value within each denial-reason segment and work top-down.

Can we still get paid on a claim past timely filing?

Sometimes. If you have clearinghouse acknowledgment reports showing the original submission was inside the window, most payers will honor it with a proof-of-timely-filing appeal. If the claim genuinely was never submitted in time, recovery is unlikely on commercial and Medicaid — though some payers have hardship or extenuating-circumstance exceptions worth pursuing on high-dollar claims.

How often should aged AR be reviewed?

Working AR is a daily activity; formal aging review should happen weekly with billing, UR, and clinical leadership in the same conversation. A monthly cadence is too slow — claims move across aging buckets every 30 days, and by the time you notice a trend at 90 days, another cohort is already piling up behind it.

What denial codes should we prioritize when working an aged bucket?

Prioritize denials that are correctable and appealable: CO-197 (authorization missing/invalid), CO-50 (non-covered, medical necessity), CO-16 (missing information), and CO-11 (diagnosis inconsistent with procedure). These typically have real recovery paths. Denials like CO-29 (past timely filing) or CO-27 (coverage terminated) usually mean write-off unless you have documentation that overrides the denial reason.

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