Your billing team has just posted all the payments from last month. The collection process seems fine. The AR is in the right range. There are not any significant denials waiting to be worked. Everything seems great, according to surface indicators.
But everything is not okay. Some of those payments which have already been processed are buried under remittance codes all labeled as paid and hold the difference between what you were supposed to get under your contractual agreement and what you actually received. This difference didn’t cause any denial to take place. This didn’t cause anything to need following up. This was just a payment and got posted without anyone even noticing. It will happen again next month.
This is how underpayments are done in the medical billing industry. Not a big fraudulent scheme. Not a mistake in the bill. Simply a way through which money that was already earned starts to seep away unnoticed until you start to compare what the payer paid against what you should have gotten.
For most practices, that comparison is a sobering experience. Industry research consistently finds that providers lose between 1% and 11% of net revenue annually to underpayments from commercial payers alone. For a mid-size practice, that can mean anywhere from $250,000 to $1.5 million in recoverable revenue per year. Not revenue that was never billed. Not revenue that was denied. Revenue that was billed, processed, and paid just not at the rate the contract required.
The practices that recover this money aren’t doing anything exotic. They have a system. They know what to look for, where underpayments hide, and how to appeal them before payer timelines close. They work with professional medical billing services that treat underpayment recovery as a standing operational discipline rather than an emergency audit triggered by a bad month.
This blog will explain exactly how to build that system starting with the basics of what underpayment actually is and ending with a practical, step-by-step approach to finding and recovering the revenue your practice has already earned.
What Underpayment Actually Means and Why Most Practices Miss It
Before anything else, it is worth getting precise about terminology, because the confusion between underpayment, denial, and rejection is one of the reasons underpayment recovery gets neglected.
A claim rejection is a technical failure. The claim came back before it was ever adjudicated wrong format, missing field, invalid code. It needs to be corrected and resubmitted. Your billing team sees it immediately. A claim denial is a payer decision. The claim was received, reviewed, and the payer declined to pay. A denial code is generated. It shows up in your system as unpaid. Someone has to work on it.
An underpayment is neither of those things. The claim was received, reviewed, adjudicated, and paid. It just wasn’t paid correctly. The payer remitted less than your contract requires and then posted that lower payment as the contractual obligation, writing off the difference as an adjustment. No denial code. No follow-up queue. No signal that anything went wrong. Payers routinely post underpayments as contractual adjustments making them invisible without a contract-level reconciliation process.
That is the core of the problem. Without a systematic process for comparing every payment against the contracted rate for that specific CPT code, modifier, and payer underpayments look exactly like correct payments. They slide through, close out, and compound.
And the numbers at the macro level confirm how serious this has become. The AHA’s 2025 Cost of Caring report reveals that Medicare and Medicaid alone underpaid U.S. hospitals by $130 billion in 2023, with Medicare reimbursing just 83 cents for every dollar hospitals spent on care. Commercial players haven’t been much better. In August 2025, a federal judge granted final approval for Blue Cross Blue Shield’s plan to pay $2.8 billion in underpayments to hospitals and healthcare organizations. Shortly before that, an arbitration panel ordered United Healthcare to pay $91.2 million to Envision Healthcare for violating their reimbursement agreement.
These are not isolated settlements between massive health systems and billion-dollar insurers. They are reflections of industry-wide patterns. The same payer behaviors that produced those outcomes are affecting your practice just at a scale that does not attract a federal judge’s attention. That doesn’t make the money less recoverable. It makes the recovery process more your responsibility.
Understanding the Number That Should Drive Everything
Every claim you submit has a contractual ceiling the maximum your payer has agreed to pay for a specific service. That ceiling is called the allowed amount. And yet, despite being the foundational number in every payment reconciliation, it’s one that a surprising number of billing teams can’t retrieve on demand for their most common procedure codes.
The allowed amount is not your billed charge. It is not the Medicare fee schedule rate, unless your contract specifically ties reimbursement to a percentage of Medicare. It is the rate established in your signed contract with that specific payer and it can vary significantly from one payer to the next, from one specialty to another, and even from one facility location to another within the same payer relationship.
Here is what determines it, and why each element matters for recovery:
Your Signed Contract and Fee Schedule
This is the legal source of truth. Every commercial payer contract includes either an explicit fee schedule listing allowed amounts by CPT code or a formula tied to another benchmark, such as “115% of Medicare” or “110% of the current Medicare Physician Fee Schedule.” Knowing which applies to each payer contract is step one. If you’ve signed contracts you haven’t read carefully, this is the moment to change that.
Annual Contract Renewals and Rate Updates
Contracts renew. Rates change. What your contract allowed for a 99213 two years ago may be different from what it allows today and whether it changed in your favor or the payer’s depends on negotiation outcomes that your billing team may not have been looped in on. Even when contracts update correctly, payer systems often lag 90 to 180 days in actually applying the new rates to claim adjudication. During that window, your claims are being paid at the old rate. If the old rate is lower than the new one, you are being underpaid and those months are recoverable if you catch them before the appeal window closes.
CPT Code Mapping in Payer Systems
Medical billing codes change constantly. The AMA releases approximately 300 to 400 new CPT codes annually. When new codes go live, payer systems don’t always map them correctly to the appropriate reimbursement level. A new code may get priced as a less complex existing code, or flagged as unrecognized and paid at a nominal amount rather than the actual contracted rate. This creates a category of underpayment that’s entirely invisible unless someone is tracking new code introductions and verifying how each payer is adjudicating them.
Modifier-based Rate Variations
Many procedures bill with modifiers that affect reimbursement. Bilateral procedures, assistant surgeon arrangements, co-surgeon cases, and multiple procedure discounts all generate rate calculations that are modifier-specific and payer adjudication of modifier combinations is notoriously inconsistent. Your contract may specify that a bilateral modifier should result in 150% of the unilateral rate. The payer’s system may be paying 100%. Without a modifier-level audit, that gap is permanent.
Geographic and Facility-type Variations
Some payer contracts include rate differentiation based on facility type office, ASC, hospital outpatient, hospital inpatient or on geographic region. A practice billing under a hospital-based contract for outpatient services but posting payment at the office rate is consistently underpaid. Practices with multiple locations billing under a single contract need to verify that location-specific rates are applied correctly. Knowing your allowed amounts not just for your top five codes, but for your top fifty is not optional if you want to catch underpayments. It’s the prerequisite for everything else.
Contract Rates: The Invisible Benchmark Most Practices Never Check
When did someone at your practice last open your payer contracts, pull the fee schedule, and confirm that the rates being paid match the rates being agreed to? For many practices including ones that are otherwise well-run the honest answer is not recently. And that gap in oversight is exactly where underpayment accumulates.
Contract rate management is the operational process of maintaining an accurate, current record of your agreed reimbursement rates with every active payer, loading those rates into your billing system, and configuring your payment posting workflow to flag discrepancies. Done well, it makes underpayment visible in real time. Done poorly or not at all it leaves every payment posting as a black box where you trust the payer’s calculation without verifying it.
The complexity compounds quickly for practices with multiple payer relationships. In a multi-specialty group with 10 payers, uncorrected underpayments often account for 3% to 5% of total annual collections. That is not a rounding error. That is a significant and systematic revenue loss. Providers with sub-agreements, letter amendments, or rate carve-outs often have conflicting rate files, situations where the base contract says one thing, an amendment letter says another, and neither one is fully reflected in the billing system. When those conflicts exist, players almost always resolve them in their own favor. The practice accepts the lower payment because they don’t have the contract infrastructure to challenge it.
The fix is not complicated, but it requires deliberate attention. Load your current fee schedules by payer into your billing software. Flag contracts due for renewal 90 days in advance. When a renewal occurs, request an updated fee schedule in writing and verify that the new rates are reflected in payment adjudication within 30 days of the effective date. Track any variance between expected and actual payments by payer and CPT code. Build this into a monthly reconciliation routine rather than a quarterly or annual review. Practices that do this consistently find that the recovery from just one contract’s previously undetected underpayments often exceeds the cost of the entire billing team’s time spent on the reconciliation.
Payer Patterns: Where Underpayments Cluster and Why
Underpayments are not randomly distributed across your claim volume. They cluster. They concentrate around specific payers, specific procedure codes, specific modifiers, and specific claim types. The practices that recover the most revenue are the ones that understand those patterns well enough to know where to look first.
High-volume CPT Code Underpayment
Your top ten procedure codes by volume are also your highest underpayment exposure not because the rate is wrong more often, but because small errors at high volume produce large total losses. A payer paying $3 below contract on a code you bill 600 times per month represents $21,600 per year in underpayments from that one code and that one payer. Multiplied across your payer mix and your top ten codes, the cumulative impact is often staggering.
E/M Visit Downcoding
Evaluation and management downcoding happens in two directions: coders submitting lower complexity codes than the documentation supports, and payers systematically downgrading submitted E/M levels on their end without notifying the practice. Under-coded E/M visits encounters documented at a complexity that supports a higher code than the one billed account for 3% to 8% of recoverable annual revenue. A quarterly comparison of E/M code distribution against documented complexity levels is one of the highest-return audits a practice can run. Accurate medical coding services help identify coding-related reimbursement gaps, improve documentation alignment, and ensure claims are submitted at appropriate payment levels.
Managed Care and Medicare AdvantageVariability
Hospital reimbursement from Medicare Advantage plans fell 8.8% on a cost basis between 2019 and 2024, even as MA enrollment grew to cover more than half of all Medicare beneficiaries. MA plans set their own reimbursement rates, and those rates as well as how consistently they’re applied vary significantly between plans and between plan years. Practices with growing MA patient populations that haven’t reviewed their MA contract rates recently are almost certainly sitting on undetected underpayments.
Global Period and Bundling Disputes
Surgical practices face a particular category of underpayment risk related to global period management and bundling. When a payer bundles a service that should be separately reimbursable or applies a global period rule that shouldn’t apply in a specific clinical scenario the result is an underpayment that requires clinical and coding documentation to overturn. For OB-GYN practices, global OB bundling versus separate procedure billing is the single largest driver of underpayment recovery.
Chronic Care Management and Wellness Visit Underpayment
For primary care and internal medicine practices, Chronic Care Management and Annual Wellness Visits are the most underutilized revenue streams and they are also among the most commonly underpaid. CCM billing requires specific documentation of time, staff involvement, and care plan elements. When any of those elements are questioned by a payer, payment often comes in below the contracted rate, and the complexity of the service type makes it difficult for in-house billing teams to challenge.
Telehealth Billing under 2026 CMS Guidelines
Telehealth billing has become its own underpayment category. Telehealth billing under 2026 CMS guidelines particularly for audio-only visits is the fastest-emerging denial and underpayment category in primary care. Payer-specific telehealth coverage rules vary enormously, and the intersection of place-of-service codes, modifier requirements, and visit type documentation creates ample opportunity for payers to adjudicate at incorrect rates.
How to Find Underpayments: A Practical Recovery Framework
You don’t need a six-month project or a new software platform to start finding underpayments. What you need is a clear process, executed consistently. Managing payment audits, contract verification, and payer follow-ups requires dedicated expertise. Outsource medical billing services provide structured support to recover missed revenue.
Start with your Biggest Payers and your Busiest Codes
Pull remittance data from your top three payers for the last 90 days. Identify the 20 CPT codes with the highest volume. Compare every payment posted against the contracted rate for each code. Any payment below that rate is an underpayment. Sort results by total dollar variance, largest to smallest. This tells you exactly where to focus your recovery efforts for maximum financial return.
Set up a Payment Variance Flag in your Billing System
Most modern practice management systems allow you to load payer fee schedules and configure an automatic flag when a posted payment falls below the contracted rate. If your system supports this and you’re not using it, you’re manually absorbing underpayments that technology could catch automatically. Get this configured before next month’s posting cycle.
Run a Modifier-specific Audit
Pull all claims from the last six months that included bilateral, assistant surgeon, or multiple procedure modifiers. Verify that the modifier-adjusted rate paid matches your contract’s specified modifier payment policy. This is tedious work, but modifier-related underpayments are among the most consistently recoverable because the contract language is usually unambiguous.
Check Contract Renewal Dates Against Payment Patterns
If you had a contract renewal in the last 12 months, pull payment data for the 60 days following the renewal effective date and compare against both the old and new rates. If payments didn’t change on the renewal date or changed to the wrong rate you have a documented underpayment pattern with a specific start date that strengthens your appeal.
Identify Payer-specific Trends
Group your underpayment findings by payer. If a single payer is responsible for 60% of your variance, that’s a systemic adjudication issue not a coincidence. In that case, the appropriate response isn’t a series of individual claim appeals. It’s a formal dispute with the payer’s provider relations team, presenting your aggregate data as evidence of a systematic payment error.
Appeal within Timelines Every Time
Underpayment appeals have payer-specified filing deadlines. Most commercial payers require appeals within 60 to 180 days of the payment date. After that window closes, the recovery opportunity is almost always gone regardless of the merits of the case. Working underpayments within your recovery window is what separates practices that recapture revenue from practices that discover losses they can no longer do anything about. Professional denial management services help providers track payer responses, handle appeals efficiently, and prevent avoidable revenue losses caused by unresolved claims.
The Hidden Cost of Not Having a Process
There is a tendency in medical practice management to treat underpayment recovery as something to tackle when things are slow. The problem is that things are rarely slow. When claim volume is high, posting backlogs accumulate and reconciliation gets deferred. When staffing is short, the most time-intensive tasks, the ones that require pulling contracts and comparing rates line by line are the first to get dropped.
Meanwhile, payer appeal windows are closing. Six months of underpayments are becoming permanently unrecoverable. And the practice continues accepting less than it’s owed because no one has built the process that makes recovery a routine rather than an exception.
In 2025, hospitals across the country spent nearly $18 billion overturning claim denials resources devoted entirely to fighting for revenue that should have been paid correctly the first time. The administrative burden of underpayment recovery is real. But it pales in comparison to the cost of not doing it.
In a multi-specialty group generating $10 million in annual collections, closing the gap between an 87% and 97% net collection ratio isn’t a matter of operational efficiency; it’s a million dollars that was always the practice’s, systematically surrendered to payer process gaps.
That framing matters. Underpayment recovery isn’t about fighting with insurance companies. It’s about collecting what contracts already guarantee you. The reimbursement exists. The contract specifies it. The only question is whether your billing operation has the infrastructure and the discipline to actually receive it.
Why AR Management Is the Core of Underpayment Recovery
Underpayment recovery is an accounts receivable function. It requires the same discipline, payer expertise, documentation fluency, and systematic follow-through as denial management and in many ways, it’s harder, because the claims appear closed and the losses don’t announce themselves.
Effective accounts receivable management services address underpayment through several overlapping capabilities: contract-level rate verification for every active payer relationship, payment variance identification at the CPT and modifier level, trend analysis that surfaces payer-specific patterns before they compound, and appeals management that works recovery opportunities within payer deadlines.
These are not capabilities that most in-house billing teams stretched thin across daily claim submissions, patient calls, and posting backlogs can consistently maintain alongside everything else. That’s not a criticism of in-house billing staff. It is a recognition that underpayment recovery requires dedicated focus, current contract knowledge, and payer-specific expertise that’s genuinely difficult to sustain without dedicated resources.
What makes a good AR management partner in this context is specificity: not just a team that works aging reports and follows up on denials, but one that has the contract infrastructure to identify underpayments, the payer relationship experience to dispute them effectively, and the reporting visibility to show your practice exactly what was recovered, from which payer, and why.
Practices that invest in this level of AR management consistently find that the additional collections exceed the cost of the service often by a significant margin. Because the revenue being recovered was never lost in the sense of being uncollectable. It was just uncollected. There is a meaningful difference.
Building the Habit: What an Ongoing Recovery Process Looks Like
One-time audits are valuable. They reveal historical losses and, in some cases, recover a meaningful amount of revenue that would otherwise stay buried. But the practices that sustainably outperform on collections treat underpayment recovery as an ongoing operational discipline, not a project. A comprehensive medical billing audit checklist helps providers review payment accuracy, identify revenue gaps, verify compliance, and strengthen billing performance in 2026
Here is what that looks like in practice:
Monthly
Run a payment variance report on your top 20 CPT codes by volume for each of your top three payers. Flag any claim where the payment falls below the contracted rate. Route those flags to a dedicated follow-up workflow not to the same queue as standard denials, but to a reconciliation process that compares payment against contract and generates an appeal when the variance is confirmed.
Quarterly
Audit modifier usage and payment accuracy for your most complex claim types bilateral procedures, surgical cases, E/M visits with procedure same-day, and any telehealth encounters. Compare your payer-level collection rates against contracted rate benchmarks. Identify any payer where collections have trended downward without a corresponding change in your contract or code mix.
At Every Contract Renewal
Request an updated fee schedule in writing, compare it to the prior year, and load the new rates into your billing system before the renewal effective date. Set a 30-day verification checkpoint to confirm that post-renewal payments are processed at the new rates. Document this process if a dispute arises, the documentation of your contract management process strengthens your position.
Annually
Commission a full underpayment audit covering the last 12 months. Compare your actual net collection rates against your contracted rates by payer. Identify payers where systematic underpayment patterns exist. Using the findings as leverage in contract renegotiations underpayment data is among the most compelling evidence you can bring to a payer negotiation.
The Revenue Is Already Yours You Just Have to Collect It
Here is the thing about underpayment recovery that does not get said often enough: this money is not in dispute. It is not a gray area. It is not subject to clinical judgment or coding interpretation. It is a contractual shortfall a payer paying less than a signed agreement requires and the legal and ethical case for recovery is as clear as billing gets.
The barrier is not merit. It is a process. Practices that build the process that load current fee schedules, run variance reports, work appeals before windows close, and treat underpayment as an ongoing AR function rather than a periodic audit project consistently outperform those that don’t. Not because they are billing for services they did not provide. Because they are collecting for services they did.
If your practice has not reconciled payer payments against contracted rates in the last 90 days, there is almost certainly recoverable revenue sitting in your payment history right now. The appeal windows on the oldest of those claims are closing. Every month you wait is a month of recoverable revenue that becomes permanently unrecoverable.
Underpayment Recovery in Healthcare Billing: What Is the Role of iSolve RCM?
Underpayment recovery is one of the revenue opportunities in medical billing that can substantially affect the financial state of the organization. iSolve RCM helps in an efficient way to find and address revenue underpayments due to payment variance analysis, payer rate verification, evaluation of the underpayment of claims, and implementation of proper follow-up procedures. iSolve RCM uncovers and recovers missed revenue with the help of professional revenue cycle management, payment audit, and payer-specific experience.
FAQs
What is underpayment recovery in medical billing?
Underpayment Recovery refers to the process of determining underpayment claims when medical professionals have not been reimbursed enough. It entails the analysis of payer payment, contract, and claim information for the purpose of making up lost revenue.
How does iSolve RCM identify underpaid claims?
iSolve RCM employs payment auditing, contract analysis, and state-of-the-art revenue cycle technology to pinpoint areas of discrepancy in reimbursement. Our professionals will analyze the difference between the expected amount of money versus the actual reimbursement from your payers.
Why do medical billing underpayments occur frequently?
Underpayment could result from erroneous calculations done by the payer, contract disputes, problems in coding, bundled payments, missing modifiers, or processing errors. If no payment reviews are done on a regular basis, then such healthcare organizations may fail to identify such revenue leakage.
How can underpayment recovery improve revenue cycle performance?
An efficient underpayment recovery process allows the healthcare organization to identify the loss of revenue and address any financial leakage problem. With the help of an effective underpayment recovery process, the healthcare organization is able to improve its revenue cycle management results.
What services does iSolve RCM provide for revenue recovery?
iSolve RCM provides a complete package of underpayment recovery solutions which include claim auditing, payment variance review, payer follow-up, denial management, and reimbursement review. This will enable the provider to recoup their lost revenues without compromising on proper billing practices.
How often should providers perform underpayment audits?
A healthcare organization should perform underpayment audits frequently to detect any revenue losses as soon as possible. This is because the audits will enable the provider to detect payment discrepancies, ensure compliance with the contracts and avoid repetition of problems.
