Most urgent care operators can say what a locum shift costs, because it arrives as a line on an invoice. Few can say what an unfilled shift costs, because that cost never appears in one place. It's spread across visits that didn't happen, overtime, longer waits and the people who covered the gap.
That makes the comparison lopsided. The cost of covering a shift is visible and the cost of leaving it open isn't, so the open shift tends to look cheaper than it is. This post is a worksheet for the second number. It uses your clinic's own figures, because the answer depends on your volume, payer mix and hours.
The four costs of an unfilled urgent care shift
1. Visits you didn't see
An urgent care with an unfilled provider shift does one of three things: it closes for those hours, it closes early, or it runs with fewer clinicians than the volume needs. In each case some patients who would have been seen aren't.
If the clinic closed, the lost visits are your usual volume for those hours. If it ran short, they're the patients who left before being seen, plus any you turned away once the queue was too long to clear by closing. Your EMR or queue system can give you both: typical visits for that block, and check-ins without a completed visit.
Multiply the lost visits by your average net collected revenue per visit, not the billed charge. Rent, front desk and support staff are paid for those hours whether the visits happen or not, so little of that lost revenue is offset by savings.
2. Premium labor to cover what you could
The gap usually gets partly covered. A clinician stays late, someone comes in on a day off, or you find last-minute coverage at a higher rate than you'd have paid with notice. Add up the hours at their premium rates and subtract what the same hours would have cost at the normal rate. The difference belongs to the unfilled shift.
Count the support side as well. RNs and MAs often stay past close to clear a queue that one clinician couldn't finish on time.
3. Longer waits for everyone who stayed
The patients who did get seen waited longer, and a long wait changes how they judge the whole visit. In a study of 44 ambulatory clinics at one academic medical center, longer waits went with lower satisfaction scores, lower confidence in the care provider and lower perceived quality of care.
This cost is real and hard to price. A practical way to track it is to tag the reviews, complaints and survey responses that came from short-staffed shifts and compare them with the rest. How shift coverage drives urgent care wait times goes into the mechanism.
4. Load on the permanent team
Every unfilled shift is covered by someone, and it's usually the same few people. One extra shift is an inconvenience. A pattern of them is a reason to cut hours or leave, and replacing a clinician brings recruiting costs and a vacancy that produces more unfilled shifts.
You won't get a per-shift figure for this. Track the pattern: how many unplanned extra hours each clinician worked in the last quarter, and whether the people with the most are the ones reducing their availability.
A worksheet for the cost of one unfilled shift
Fill this in for a real shift from the last few months, using your own records.
| Line | How to get it |
|---|---|
| A. Visits lost | Usual visits for those hours minus visits completed, or check-ins without a completed visit |
| B. Net revenue per visit | Average collected per visit for your payer mix |
| C. Lost revenue | A × B |
| D. Premium labor | Extra hours worked × (premium rate minus normal rate), for clinicians and support staff |
| E. Direct cost of the unfilled shift | C + D |
| F. What covering it would have cost | The shift's hours × the rate you'd pay for coverage, including any agency or platform fee |
If E is larger than F, leaving the shift open cost you more than covering it would have. The third and fourth costs above, the longer waits and the load on your team, sit on top of E and push in the same direction.
Run it for a slow shift and a peak shift. The results will differ sharply, which tells you where coverage matters most and how much you can sensibly pay for it.
Counting unfilled shifts over a year
One shift is an anecdote. The useful number is the yearly one: how many provider shifts went unfilled or short, and at which hours.
Count them by weekday and time block, since gaps tend to concentrate on the shifts that are hardest to staff. Multiply the count for each block by the worksheet result for a typical shift in that block. The total is what the current approach costs, and it's the budget against which any coverage plan should be judged.
Forecasting walk-in volume from historical data helps with the volume side of this, and staffing ratios by patient volume with how many provider hours each block needs.
Lowering the cost of unfilled shifts
The worksheet usually points to three changes.
Find gaps earlier. A shift known to be open two weeks out can be posted and filled at a normal rate. The same shift discovered that morning is covered with overtime or not at all. Approved time off, known departures and seasonal peaks such as flu season are all visible in advance.
Clear clinicians before you need them. A clinician who hasn't been through your clinic's review can't work tomorrow's shift however available they are. Complete the review and EMR setup for a few locum clinicians ahead of time, so that an open shift only has to be scheduled.
Know the full price of coverage. When you compare options, compare the total you'll be billed for the shift. With a staffing agency, ask what's included in the bill rate. With any source, ask for that total in writing before the shift is booked.
Use the number
Once you have a per-shift cost for your peak blocks, put it to work. It sets the rate you can justify for a hard-to-fill shift. It tells you whether an overlap shift at peak hours pays for itself. And it gives you a figure to bring to the owner or the group's finance lead when asking for a coverage budget.
Rediworks is a self-service marketplace for urgent care locum shifts. You post the shifts you need by clinician type and date, and clinicians apply with a credential wallet they've already built. Sign up to post shifts.