Days Sales Outstanding (DSO)
Days Sales Outstanding (DSO), often called days in accounts receivable, measures the average number of days it takes to collect payment after a service is billed. For ASCs, a lower DSO indicates faster cash flow and healthier revenue-cycle performance.
What is Days Sales Outstanding (DSO)?
Days Sales Outstanding (DSO), sometimes referred to as days in accounts receivable, is a measure of how long, on average, it takes an organization to turn a billed service into collected cash. It is calculated by relating outstanding receivables to the volume of charges generated over a given period, then expressing the result as a number of days.
A lower figure means money is arriving sooner after care is delivered, while a higher figure means dollars are sitting unpaid in accounts receivable for longer stretches. Because it is a rolling average, DSO smooths out the variability of individual claims and gives a single, trackable view of collection speed.
Why does DSO matter for surgery centers?
Ambulatory surgery centers carry real costs the moment a case is performed, from implants and supplies to staffing, so the gap between service and payment directly affects working capital. When DSO climbs, the center is effectively financing its payers, which can strain cash reserves and make it harder to invest in equipment or growth.
Tracking DSO also surfaces problems earlier in the revenue cycle. A sudden rise often points to upstream issues such as eligibility gaps, coding delays, or a spike in denials, making the metric a useful early-warning signal rather than just a scorecard.
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