Old AR Recovery: What Aged Medical Accounts Receivable Is Actually Still Collectible

Here is a report we see every week. A three-provider practice carries $410,000 in total accounts receivable. The 0-30 day bucket holds $145,000, which is healthy. The 31-90 day buckets hold another $102,000, manageable. Then comes the line nobody wants to discuss: $163,000 sitting at 121 days and older. Forty percent of the practice's receivables are more than four months old, and the owner has spent a year telling herself it will all come in eventually. It will not. A meaningful share of that $163,000 is already gone, killed by deadlines that passed months ago, and no recovery firm on earth can resurrect it. That is the uncomfortable part. The useful part is that old AR is never uniformly dead. Buried inside that bucket are denied claims still inside their appeal windows, underpayments with long contractual look-back periods, and claims that failed for reasons a competent biller can fix this week. The entire discipline of old AR recovery comes down to one skill: telling the difference quickly, before more clocks run out. This post walks through how a recovery team triages an aging report, what experience says is still collectible, what should be written off without a second thought, and how an honest engagement is structured. If a vendor promises to collect your entire aged balance, keep a hand on your wallet. Real recovery work starts with admitting what is dead.

Medical receivables age like produce, not wine. Work a claim inside its first 60 days and collection rates stay high, because errors get caught while the fix is still simple and every deadline is still open. Let the same claim sit until 90 or 120 days and recovery odds drop materially. Push past twelve months and, for most practices, what remains collectible narrows to a handful of specific claim types with unusual circumstances behind them. Treat those as directional truths drawn from decades of industry experience, not precise universal percentages. The real curve depends on your payer mix, your contracts, and why the claims aged in the first place. A claim sitting at 150 days because the payer requested records and received them last week is in far better shape than a claim at 150 days because nobody ever touched it. The decay is not smooth, either. It moves in cliffs. A claim can hold most of its value for months, then lose all of it in a single day, the day a filing or appeal deadline passes. That is why sorting old AR by age alone tells you surprisingly little. What actually determines whether a dollar on your report is money or memory is a pair of deadlines, and they deserve their own section.

Two clocks run on every claim, and they run separately. The first is timely filing. Every payer contract sets a window for submitting the original claim, and the windows vary wildly. Some commercial and Medicaid plans allow as little as 90 days. Medicare allows 12 months. Everything in between exists somewhere in your contract stack. Miss the window on a claim that was never submitted and the claim is dead. Narrow exceptions exist (retroactive eligibility, documented payer error), but they are exceptions, and banking on them is not a strategy. The second clock is the appeal deadline, and it starts from a different event. When a payer denies a claim, most contracts give you somewhere between 60 and 180 days from the denial date to appeal. Notice what that means. The clock runs from the denial, not from the date of service. A claim from 14 months ago that was filed on time and denied only recently is very much alive, even though it looks ancient on your aging report. We find these in almost every old AR project: claims a practice mentally wrote off as too old that are, contractually, still in play. Check your specific contracts before assuming any of these numbers, because every payer writes its own rules. The core idea holds everywhere, though. Age by itself does not kill a claim. Missed deadlines do. Triage means finding every claim where a clock is still ticking and working those first.

Five categories of aged claims produce most of the money in a typical recovery project. Denied claims still inside their appeal windows come first. These are the freshest opportunities, and appeals filed with proper documentation win far more often than most practice owners expect. Underpaid claims come second, and they are the sleeper category. When a payer pays a claim below the contracted rate, you have a payment variance rather than a denial, and many contracts allow variance disputes for 12 to 24 months after the payment date. A recovery team that runs your actual payments against your fee schedules will routinely find money on claims everyone considered closed. Third, claims denied for fixable administrative reasons. A CO-16 denial (claim lacks information) means the payer wants something that never arrived: an attachment, an identifier, a corrected field. Supply it, resubmit inside timely filing, and the claim frequently pays. Our denial code reference breaks down which codes signal fixable problems and which signal final ones. Fourth, credentialing-period claims. When claims were denied because a provider was not yet enrolled with the payer, and enrollment was later granted retroactively, those claims can often be rebilled and paid in full. Fifth, secondary payer balances that never crossed over. The primary paid, the secondary claim was never generated, and the balance aged in silence. These are pure recovery. No dispute is required, only the work nobody did.

Write-offs feel like failure, so practices avoid them, and the avoidance costs real money in staff hours spent chasing balances that cannot pay. Claims that were never filed and are now past timely filing belong at the top of the write-off list. No appeal path exists for a claim that was never submitted. The productive response is to find out why claims went unfiled (a biller who left, a clearinghouse rejection queue nobody watched, an interface that failed silently) and fix that root cause so the next batch does not evaporate the same way. Sequestration reductions, which appear as CO-253 on your remittances, are federal law. That money is not coming back, and any vendor listing it as recoverable inventory is padding the file. True contractual adjustments are the difference between your charges and your negotiated rates. They were never your money to begin with. Then there is the small-balance math almost everyone gets wrong. MGMA pegs the average cost of reworking a claim at $25. Reworking a $12 balance is a guaranteed loss even when you win it, and reworking a $30 balance at a coin-flip success rate loses money too. A disciplined recovery operation sets a floor, writes off balances beneath it in bulk, and spends its hours where the dollars are. Clearing the dead weight has its own payoff. Your aging report shrinks to claims worth fighting for, and every number left on it means something.

Why does so much recoverable money die on aging reports? Because most practices never fight. HFMA benchmarking has found that up to 65% of denied claims are never resubmitted at all. The claim comes back denied, lands in a work queue behind today's charge entry, and ages past its appeal deadline while everyone stays busy with new claims. Look at what happens when practices do fight. In Premier's 2024-2025 hospital survey, roughly 70% of denials that were appealed were ultimately overturned. Kodiak Solutions data points the same direction from another angle: payers end up paying about 90% of the claims they initially deny. Read those findings together and an initial denial starts to look less like a verdict and more like an opening position. Payers deny at scale because denial is cheap and a predictable share of providers will simply give up. Your old AR bucket is where the giving up accumulated. Every unresubmitted denial from the past year is sitting in it, and a portion of those claims still have live appeal clocks. To see which denial reasons likely dominate your pile, our breakdown of the most common denial codes in medical billing covers the codes we see most and how fixable each tends to be. The math only fails when nobody does the work. Which raises the practical question: whose work should it be, and on what terms?

Before you sign with anyone, including us, you should know what the first two weeks are supposed to look like. A legitimate firm opens with an aging analysis rather than a blanket contract on your whole balance. That means pulling every open claim, tagging each by payer, denial reason, filing status, and remaining deadline, then splitting the file into three piles. Dead: recommended for write-off, with the reason documented on each claim. Alive: workable now, sorted by deadline urgency and dollar value. Conditional: needs something from you first, such as payer contracts or medical records, before anyone can render a verdict. Expect the dead pile to be large. On a badly aged book, a third to half of the 120-plus bucket often proves unworkable, and a firm that tells you so up front is showing you its underwriting. On contingency, it only gets paid on what it collects, so it has every reason to be ruthless about what it takes on. The live claims then get worked in deadline order. Appeals about to expire go first, regardless of size. Underpayment audits run in parallel, since their look-back windows stretch longer. Credentialing rebills and secondary submissions follow, because they mostly need labor rather than argument. Our AR recovery service at Go Medical Billing runs exactly this sequence, on the contingency basis typical for the industry: a percentage of what we actually collect for you, and nothing on what we cannot. Confirming your dead claims as dead costs you zero, and the write-off documentation alone cleans up your books.

Interview a recovery vendor the way you would interview a senior biller, with questions that have checkable answers. Ask what percentage of your aged balance they expect to write off. A firm that answers 'very little' either has not looked at your file or is not being straight with you. Real answers come with ranges and reasons attached. Ask how they prioritize. The right answer starts with deadlines, then dollars. If the answer is oldest first or largest first, the triage logic is missing, and appeal windows will close while they grind through the wrong pile. Ask what happens to root causes. Recovering old AR without fixing the process that created it books you a return appointment in 18 months. A proper closing report tells you why the money aged: which payers, which denial codes, which process gaps. Ask how they get paid. Contingency pricing puts the vendor's incentive exactly where yours is, on actual collections, and gives them no reason to inflate the workable file. Hourly pricing on old AR pays someone to work claims that cannot pay you back. Finally, ask to see the aging analysis before you commit to anything. A firm that will not show you the triage is selling a promise instead of a plan. If you have a 120-plus bucket you stopped believing in months ago, send us the report. Get in touch and we will tell you what is dead, what is alive, and roughly what the living portion is worth, before you owe anyone a dollar.