Healthcare Underpayments: How They Impact Hospital Revenue (And Why They Go Undetected)
November 17, 2025
Payer underpayments are one of the most significant—and least visible—drivers of hospital revenue loss. Unlike denials, which are tracked and actively managed, underpayments often go unnoticed, quietly eroding margins across thousands of claims.
For many health systems, the true financial impact isn’t fully understood until a deeper analysis reveals how much revenue has already been lost.
Ask a CFO about their biggest revenue cycle concerns, and denials will likely top the list. They're visible. They generate alerts. They have defined workflows. But below the threshold of most monitoring systems, a quieter form of revenue loss compounds month after month.
Underpayments. And for many health systems, they're costing far more than anyone has measured.
The Visibility Problem
A 2025 analysis from Kodiak Solutions found that net revenue leakage at hospitals from denials and bad debt combined grew by roughly 25% in a single year, with analyzed hospitals collectively losing more than $48.4 billion, up from $38.6 billion the prior year. That number captures the scale of the problem, but it doesn’t reflect how payer underpayments actually behave—silently, below detection, in accounts that appear closed.
This is why healthcare underpayments often go undetected in standard workflows.
Unlike denials, which create an open balance and a workflow, underpayments typically resolve at zero insurance balance. The payer processes the claim, applies a contractual adjustment (sometimes legitimately, sometimes not) and closes the account. From the outside, everything looks fine. The hospital's revenue cycle tool moves on, the account ages out of active review, and the revenue that was owed simply disappears.
From the outside, everything looks fine. The hospital’s revenue cycle system moves on, the account ages out of active review, and the revenue that was owed simply disappears.
That invisibility is the defining characteristic of underpayments, and it’s why they accumulate so effectively.
Why Underpayments Go Undetected
Traditional revenue cycle workflows are built to identify problems that are visible—open balances, denial codes, and aging receivables. Underpayments don’t trigger any of those signals.
Instead, they blend into normal operations:
- Claims close at zero balance
- Adjustments appear contractually valid
- No alerts or work queues are triggered
Once the claim is closed, it effectively disappears from scrutiny.
Without a process designed to evaluate paid claims after adjudication, most underpayments remain hidden—no matter how significant they are in aggregate.
The Cumulative Financial Impact
Individual underpayments often appear too small to pursue. A $200 discrepancy on a single claim rarely justifies the time required to investigate and appeal it.
But at scale, the impact is substantial.
Industry analyses estimate that commercial payer underpayments cost hospitals between 1% and 3% of net patient revenue annually, with some estimates reaching as high as 11%. For a health system with $1 billion in net patient revenue, even a conservative 2% underpayment rate represents $20 million in missed recovery each year.
And that’s only part of the picture.
Government reimbursement adds additional pressure. The American Hospital Association reports that Medicare reimbursed hospitals at just 83 cents on the dollar in 2024, resulting in more than $100 billion in underpayments from government payers alone.
These aren’t isolated discrepancies—they represent systemic revenue loss across the healthcare system.
Where Underpayments Hide
Underpayments are difficult to detect because of where they occur.
Zero-balance accounts are one of the most common sources. Once a claim reaches zero, it exits active workflows—even if the payment was incorrect.
Other high-risk areas include:
- Complex claims with multiple reimbursement variables
- Medicare Advantage plans with highly variable contract terms
- Claims processed through automated adjudication systems
For example, Medicare Advantage observation stays have been shown to be significantly longer than traditional Medicare, while reimbursement covers only a fraction of the cost. Without targeted review, these discrepancies remain hidden within closed accounts.
Why Most Hospitals Only Recover a Fraction
Despite the scale of the problem, most hospitals recover only a small portion of underpayments.
The reason isn’t awareness—it’s capability.
Effective underpayment recovery requires:
- Deep expertise in payer contracts and reimbursement logic
- Technology that can evaluate entire claim populations
- Dedicated resources for post-adjudication review
- The ability to identify patterns across payers and claim types
Most organizations rely on periodic audits, which surface some issues but miss far more. The claims that get reviewed are typically the ones someone happens to notice—not the ones systematically identified.
Research shows that analytics-driven recovery programs outperform manual audits by more than 30%, highlighting how much revenue is left behind using traditional approaches.
Why Identifying Payer Underpayments Requires a Different Approach
Payer underpayments don’t follow the same patterns as denials—and they can’t be identified using the same workflows.
Because most underpayments occur after claims are processed and closed, they require a fundamentally different approach—one that evaluates paid claims against contract terms and analyzes patterns across entire claim populations.
For many organizations, this means moving beyond manual audits toward analytics-driven detection that can surface hidden discrepancies at scale.
How Revecore Helps Health Systems Recover Underpayments
Revecore helps hospitals identify and recover payer underpayments through advanced analytics, deep contract expertise, and dedicated recovery workflows designed to uncover revenue that standard processes miss.
Learn how Revecore helps hospitals recover underpayments at scale.