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Every practice has them: claims that were submitted months ago, never followed up on properly, and now sit quietly in your aging report. Old outstanding claims are one of the most overlooked sources of lost revenue in healthcare billing. Money that was already earned simply never makes it into the bank account, either because it was never chased down or because the deadline to appeal quietly passed.
A large share of old claims can still be recovered with the right process. This article covers why claims go unpaid, how to prioritize your aging accounts receivable, and the practical steps to get old balances collected before they turn into permanent write-offs.
Old claims rarely pile up because of one big mistake. They build up slowly, through a mix of small process gaps that compound over time. Denials get logged but never reviewed. Claims sit in a “pending” status with no one checking back on them. Staff sometimes assume a claim was paid without confirming it against the remittance. High claim volume leaves little time for anyone to look at aging accounts, and when billing staff turn over, accounts they were handling can simply fall through the cracks because no one else picks them up.
Once a claim passes 90 or 120 days, many practices simply give up on it. That is often a mistake. Depending on the payer and the reason for denial, claims can frequently still be corrected, appealed or resubmitted well past that point.
It is easy to treat old claims as a lost cause and move on to current billing. But aged accounts receivable represents real money your practice already earned, and even a small percentage of recovered claims can add up to significant revenue over a year. Reviewing old denials often reveals a process problem that is still costing you money today, so the recovery work doubles as an audit of what needs to change going forward.
There is also a timing factor. Patients and payers are less likely to dispute a claim the longer a practice waits before acting, so acting sooner protects your case. And cleaning up aged accounts receivable improves your financial reporting overall, which makes it easier to plan staffing, spending and growth with numbers you can actually trust.
Start by generating a full accounts receivable aging report, broken down by payer, claim age and dollar amount. Most practice management systems can sort claims into buckets such as 30, 60, 90, 120 and 120+ days.
Once you have the report, organize it so your team can work through it efficiently. Sort by dollar amount so high-value claims are addressed first, and group claims by payer since each one has different appeal timelines and processes. It also helps to separate claims by status, such as denied, pending or unpaid with no response, and to flag any claims that are approaching their timely filing or appeal deadline so those get worked first.
Not all old claims fail for the same reason, and the fix depends entirely on the cause. A claim that was denied and never appealed needs a fresh review of the denial reason and supporting documentation. A claim that was submitted but never adjudicated needs a call to the payer to confirm it was actually received. An underpaid claim needs to be compared against your contracted fee schedule to see whether a correction is owed. A claim tied to an eligibility issue needs current coverage verified so it can be rebilled to the correct payer. And a claim with missing information simply needs the missing records or authorization gathered before it can move forward.
Pulling the payer remittance advice or explanation of benefits for each claim is usually the fastest way to confirm the real reason for nonpayment, since staff notes can sometimes be incomplete or outdated.
Before spending time on any old claim, confirm whether the window to act on it has already closed. Timely filing limits and appeal deadlines vary by payer, typically ranging from 90 days to a year or more, and once they pass, recovery becomes far more difficult.
Sort your claims by how close they are to their deadline and handle those first, and keep a reference sheet of filing and appeal timelines for your top payers so staff are not searching for this information every time. Document every submission date in case a dispute arises later. If a deadline has already passed, it is still worth checking whether the payer allows exceptions for documented delays, such as an eligibility error that was actually the payer’s fault.
For claims that are simply stuck in limbo, a phone call or payer portal check can resolve the issue faster than resubmitting blindly. When speaking with a payer representative, be ready to confirm the claim number, date of service and billed amount, whether the claim was received and when, the specific reason for denial or delay in the payer’s own words, and what documentation, if any, is needed to move the claim forward.
Always record the representative’s name, the call reference number and the date of the call. This creates a paper trail that can support an appeal if the claim is disputed again later.
Once you know the reason a claim was denied or unpaid, take the appropriate action rather than resubmitting the same claim as is.
For denied claims, correct the specific issue, whether it is a coding error, a missing modifier or incorrect patient information, and attach medical records or documentation that supports medical necessity. Write a clear appeal letter referencing the claim number and denial reason, and submit it within the payer’s appeal window while tracking the resubmission date.
For underpaid claims, compare the payment against your contracted fee schedule and file a corrected claim or payment dispute with supporting documentation. Follow up if you do not hear back within the payer’s standard turnaround time.
For claims stuck in pending status, first confirm the claim is not sitting unnoticed in a clearinghouse rejection queue. Resubmit only if the payer confirms it was never received, and escalate to a supervisor if the delay is unusually long.
Recovering old claims is only half the job. Without a better process going forward, new claims will eventually pile up the same way. Review your A/R aging report weekly instead of monthly, and assign specific staff members to own follow-up on claims past 30 days so nothing sits without an owner. Set internal deadlines that are shorter than the payer’s actual filing limits, so nothing slips through at the last minute, and track denial reasons over time to catch and fix the recurring problems behind them.
Using claim scrubbing tools to catch errors before submission also reduces how many claims turn into aging problems in the first place, and short, regular team check-ins on aging claims keep accountability visible instead of letting it fade once the initial cleanup is done.
Not every old claim can be recovered, and knowing when to stop is part of a healthy process. A claim is generally a candidate for write-off when the timely filing or appeal deadline has fully passed with no exception available, when the payer has issued a final, non-appealable determination, when the cost of continued pursuit outweighs the amount owed, or when the patient is confirmed unable to pay and collections have been exhausted.
Writing off a claim should be a deliberate decision, documented and reviewed, not something that happens by default because nobody followed up in time.
Even well-intentioned recovery efforts can fall short if a few common mistakes go unnoticed. Watch for these:
A single billing cycle rarely causes a large backlog of unpaid claims. It builds slowly, through denials that were never reviewed and follow-ups that never happened. The practices that recover the most revenue are the ones that treat aged accounts receivable as an ongoing responsibility rather than a once-a-year cleanup project.
Chasing down old claims takes time your staff often does not have, and every month of delay makes recovery harder. At IPIRCM – Intelligent Process Inside LLC, our A/R management services are built to track down aged claims, identify why they went unpaid, and pursue appeals and corrections before deadlines close. Whether you have a small backlog or years of unresolved claims, our team can help you turn that aging report into real revenue.
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