Why understaffed UM departments are quietly costing hospitals millions, and how to make the case in dollars, not just denials.
By Jonna Mayfield, BSN, RN, CMGT-BC
Ask most hospital leaders where utilization management (UM) sits on the org chart, and you’ll usually find it buried under nursing or care management: staffed, budgeted, and evaluated like a clinical support service. That framing misses what utilization review does for the hospital’s bottom line, and it’s costing organizations far more than most finance teams realize.
The Gap Between Observation and Inpatient Keeps Widening
The financial distance between an observation stay and an inpatient admission has been growing for years, and 2025 data shows it is accelerating. According to the American Hospital Association’s 2025 Cost of Caring report, Medicare Advantage plans reimbursed only 49% of the actual cost of care for patients held in observation status in 2024, and observation stays for MA patients now run 36.9% longer than for traditional Medicare beneficiaries — nearly double the gap seen just five years earlier.
On the reimbursement side, Healthcare Financial Management Association’s (HFMA) modeling puts a standard inpatient case at roughly $6,500 in expected reimbursement compared with $2,000 for the same clinical presentation discharged as observation: a $4,500 gap for identical care. Depending on the DRG family and comorbidity capture involved, that swing can run as high as $8,000 per case. Multiply that by admission volume, and the revenue exposure from misclassified or simply unreviewed cases becomes a material line item, not a rounding error.
The Math Hospital Leaders Should Be Running
Consider a mid-size community hospital admitting roughly 15,000 inpatients a year. If just one case a day is missed, an observation stay that met inpatient criteria but was never escalated for review — the math looks like this:
- At the conservative end of the range ($4,500/case): over $1.6 million in avoidable lost revenue annually.
- At the higher end ($8,000/case): approaching $2.9 million a year.
- The average annual salary for an UR/UM RN: roughly $85,000.
A single, UR nurse pays their entire salary by correctly converting fewer than 20 cases a year, well under two a month. Everything beyond that is protected margin. Understaffing the department to save on one salary line, while missing reviews on admissions that should have converted, isn’t a cost-saving decision. It’s a revenue-losing one, and usually a much larger one than the staffing line it was meant to protect.
Why This Keeps Happening
It comes back to timing. Order status is set at admission, and CMS’s two-midnight rule means the window to get that determination right, concurrently, at the front end, before the patient is discharged, is narrow. When UM departments are stretched thin, the reviews that get delayed or skipped first are exactly the ones with the most financial consequence: observation cases that meet inpatient criteria but never get escalated to a Physician Advisor for a second look.
This isn’t a documentation problem to clean up after the fact. Once a patient is discharged, that revenue opportunity has closed. Appeals can occasionally recover from a denial, but there’s no appeal for Inpatient status that was never captured.
The Cost of Understaffing Doesn’t Show Up on a Staffing Report
Hospitals track vacancy rates and cost-per-FTE closely. What’s much harder to see is the revenue that quietly disappears when reviews don’t happen, because it never shows up as a line item. It just shows up as lower net revenue per admission, and nobody traces it back to the review that didn’t happen on day one.
A well-staffed, well-trained UM function isn’t overhead. It’s one of the most direct levers a hospital has on net patient revenue, and one of the few that’s almost entirely within the hospital’s control, independent of payer negotiations or reimbursement policy.
The Answer Isn’t Always More Headcount
The instinct, once the financial exposure is clear, is often to post an open req for another UR nurse. That’s rarely the highest-leverage fix. Concurrent utilization review is a narrow, high-volume, criteria-driven task, well suited to a specialized team that applies the same medical necessity criteria accurately, on every case, every shift, regardless of PRN coverage or weekend gaps.
Discharge planning is a different kind of work: relationship-driven, hands-on, and deeply dependent on institutional knowledge (the post-acute network, the payer quirks, the family dynamics). In models where one case manager carries both roles, it’s usually discharge planning that wins the day: there’s an immediate patient in front of them who needs to leave, and that urgency is hard to argue with. Utilization review is what quietly gets shortchanged: it’s easier to defer a chart review to later in the shift than a bed that needs to turn, and “later” often means the window to catch a missed conversion has already closed.
In many cases, the better move isn’t adding headcount to the existing model. It’s redeploying the case managers already on staff to focus on discharge planning full time, where their relationships and hospital-specific knowledge matter most, while a dedicated UM partner handles concurrent review with consistent, defensible criteria. The hospital isn’t losing its UR capacity. It’s putting each nurse’s time against the work that needs their institutional expertise, while closing the consistency gap that internal coverage models struggle to avoid.
Ready to Stop Losing Revenue to Missed Reviews?
Every day a UR review doesn’t happen is revenue that’s gone for good, not delayed, not appealable, just gone. Brundage Group Utilization Management gives you a dedicated team of experienced RNs who review every admission against medical necessity criteria from the moment the order is written, so your hospitals gets reimbursed for the care it already delivered, and your case managers get to focus on the discharge planning work only they can do.
