How to Recover Old Medical AR: The 90-Day Claims Recovery Playbook

Old, unpaid claims are not dead money — not until the timely filing clock runs out. If you are wondering how to recover old AR medical claims without hiring a full collections team, a disciplined 90-day playbook is the answer. In this guide, you will learn why claims stall past 90 days, how to triage an aging pile by filing deadline and dollars, which balances to fight and which to write off, and how a batch payer-call workflow recovers revenue your staff never had time to chase.

Most practices sit on recoverable revenue without realizing it. Industry benchmarks call for keeping days in AR under 35 and the over-90-day bucket as small as possible — yet many small practices carry 25–40% of their AR past 90 days simply because nobody owns the work. Before you write off another aging claim, work this playbook. And if your in-house team cannot absorb the effort, a dedicated AR recovery engagement — structured as an add-on to your medical billing services — is usually priced on contingency, so there is no upfront cost to find out what is still collectible.

Why do medical claims stall past 90 days?

Claims stall past 90 days for one blunt reason: nobody owned them after the first rejection. A claim goes out, a payer denies or ignores it, and with no systematic follow-up the balance drifts from the 30-day bucket into the 60, 90, and 120-day buckets until the timely filing deadline kills it quietly. The top culprits are missed timely filing windows, denials that were never reworked, staff turnover leaving follow-up orphaned, eligibility errors at check-in, and credentialing gaps that make every claim for a new provider deny automatically.

The timely filing clock is what turns a slow claim into a lost one. Every payer gives you a limited window to submit (and sometimes to appeal) a claim, and once it expires the balance is uncollectible — no appeal, no negotiation. Typical windows look like this:

Notice how narrow the commercial window is: with many payers, a claim that sits untouched for 90 days may have only weeks left to live. That is why the triage step below starts with deadlines, not dollars.

How do you triage hundreds of aging claims?

You triage aging claims by sorting on two axes: how much time is left before the filing deadline expires, then how many dollars each claim is worth. Deadline-first ordering prevents the worst outcome — a high-value claim dying while you chase low-value ones that had months to spare. Run this as a one-week sprint:

1. Pull a true AR aging report from your practice management system, grouped by payer and sorted oldest to newest. Export it — you will work from a spreadsheet, not from memory.
2. Flag deadline risk. For every claim over 60 days old, note the payer’s filing or appeal deadline and the days remaining. Claims with under 60 days left go in the red zone.
3. Sort red-zone claims by dollars, highest first. These are your Tier 1 targets — they pay for the whole project if you rescue them.
4. Tag the reason each claim aged: never billed, denied and never reworked, denied and appealed once, patient responsibility never collected, or information missing. The tag determines the fix.
5. Park the unwinnable. Claims past timely filing with no contractual exception go straight to the write-off review (see the next section) instead of consuming call time.

Here is the priority framework to work from:

A practical tip: set a dollar floor for human effort. If a payer call costs you roughly $15–$25 in staff time and a mailed appeal packet costs $8–$12, claims under $50 rarely justify manual work unless they can be fixed in bulk — for example, a single coding correction that clears fifty claims at once.

What should you write off vs. fight?

The write-off decision is a math problem, not a morale problem. Fight the claim when the filing deadline is still open, the denial reason is fixable, and the balance justifies the labor. Write it off when the deadline has expired, the balance sits below your cost-to-collect floor, or the contract requires the adjustment. Emotion and sunk cost should play no part.

Two special cases deserve attention. CO-50 (medical necessity) denials look final but are frequently overturned with better documentation — in Medicare Advantage, 80.7% of appealed denials were overturned in 2024. And old AR is usually excluded from standard billing contracts, so if you are already outsourcing, check whether your agreement covers it — see our breakdown of what outsourced medical billing costs in 2026 and what is typically excluded before assuming someone else is working the pile.

Document every write-off with the reason code and the staffer who approved it. A clean write-off log protects you in audits and, more importantly, shows you exactly which front-end failures to fix so the pile never rebuilds.

How does a batch payer-call workflow actually work?

A batch payer-call workflow works by grouping claims by payer and working them in focused blocks instead of one-off calls scattered through the week. The method: same payer, same denial pattern, one prepared packet, one call block, same-day resubmission. This is how a single staffer can move dozens of claims per day instead of a handful.

1. Group by payer and denial pattern. Fifty claims denied CO-97 (bundling) with one payer is one problem with one fix — treat it as a batch, not fifty tickets.
2. Build a call packet per batch: claim numbers, dates of service, billed amounts, denial codes, and the corrected information or documentation you will reference on the call.
3. Schedule call blocks, not call gaps. Two 90-minute blocks per week beat fifteen minutes squeezed between check-ins. Payer hold times alone punish fragmented calling.
4. On the call, get three things: confirmation the claim is on file, the exact reason it is not paid, and a reference number plus the representative’s name. Log all of it in the claim notes the same day.
5. Resubmit or appeal within 24 hours while the details are fresh. A corrected claim filed the same day as the call has the highest success rate — details decay fast.
6. Escalate weekly. Any batch unresolved after two call cycles goes to a supervisor line or a written appeal with the reference numbers attached. Silence is data: it tells you which payers need the formal route.

Track two numbers per batch: dollars recovered and hours spent. After three weeks you will know your recovery rate per hour — the figure that decides whether to keep the work in-house or hand the remaining pile to specialists.

When should you bring in an AR recovery team?

Bring in an AR recovery team when the pile is too big, too old, or too specialized for your current staff to work before the deadlines expire. The clearest signals: more than 20% of your AR sits past 90 days, filing deadlines are expiring within weeks, you have no dedicated AR staffer, or a previous in-house attempt stalled. Recovery teams do this one thing all day — they know payer escalation paths, appeal language that works, and how to clear credentialing-linked denials in bulk.

What to look for in a partner:

• Contingency pricing — a percentage of what they actually recover, so the engagement funds itself. Be wary of large upfront fees on old AR.
• A deadline-first work plan — they should triage by filing risk in week one, not work alphabetically.
• Transparent reporting — weekly updates showing claims worked, dollars recovered, and what was written off with reasons.
• Root-cause feedback — the best teams tell you why the claims aged (front-desk eligibility gaps, coding patterns, a payer contract clause) so you stop regenerating the problem.

A recovery project typically runs 60–90 days for the initial sweep, with the highest-value rescues landing in the first month. After the backlog is cleared, the same team — or your own staff with the new workflow — keeps the over-90-day bucket small going forward, which is where the permanent margin gain lives.

FAQs

Can you still collect on medical claims older than a year?

Sometimes. Original Medicare allows 12 months from the date of service, and some commercial contracts allow a full year, so a 13-month-old claim may still be viable with one payer and dead with another. Check each payer’s timely filing rule for that specific date of service before spending any effort — the deadline, not the age, decides.

How much does an AR recovery service cost?

Most AR recovery engagements are priced on contingency — the firm takes a percentage of the dollars it actually recovers, with no upfront fee. That makes it one of the few revenue projects that cannot lose money: if nothing is recovered, you pay nothing. Always confirm the percentage, the definition of “recovered,” and who handles write-off approvals before signing.

What percentage of old AR is actually recoverable?

It depends on how much of the pile is still inside timely filing. Claims with open deadlines and fixable denial reasons recover at meaningful rates; claims past the filing deadline are nearly unrecoverable regardless of effort. That is why the triage step — deadline first, dollars second — determines the outcome more than anything else.

Should we work old AR in-house or outsource it?

Work it in-house if you have dedicated staff hours and the pile is modest. Outsource when deadlines are expiring within weeks, the pile exceeds a few hundred claims, or pulling staff off current billing would just create a new backlog. Many practices do a hybrid: an outside team clears the backlog while in-house staff keep current claims clean.

What is a healthy over-90-day AR benchmark?

Aim for under 20% of total AR sitting past 90 days, with overall days in AR under 40. If your over-90-day bucket is above 25–30%, treat it as an active problem: run the triage sprint above, and if the pile does not shrink within a month, bring in dedicated help before more deadlines expire.

Does appealing a denial restart the timely filing clock?

Generally no. Corrected claims and appeals usually keep the original filing date, which is why acting fast matters — every week of delay burns deadline you cannot get back. A few payers and state programs have exceptions, so verify the rule for the specific payer rather than assuming you have more time.

Next steps

Old AR is a race against the filing clock, and the practices that win it work deadline-first: triage this week, batch the payer calls, fight what is fixable, and write off the rest without guilt. Every month you wait, another slice of the pile crosses a deadline and becomes uncollectible.

If your team does not have the hours — or the pile is already past what a sprint can clear — get a professional assessment before more deadlines expire. Call (201) 942-0949 for a free AR review, or reach out through our contact page and we will tell you honestly what is recoverable and what is not.