How Many Support Staff Does a Physician Need?

A question that keeps coming back

How many support staff does a physician need? Practice management publications have answered this question for decades, and they keep answering it because the question never really settles. AAFP's Family Practice Management has run some version of this benchmark for years, and Physicians Practice covers the same ground on a regular cycle. Neither treats it as a one-time calculation. Staffing needs shift as reimbursement models change, as practices add services, and as the labor market itself changes.

The question keeps recurring for a practical reason. Support staff levels sit underneath almost every other operating decision a practice makes. Too few staff, and a physician spends time on tasks that do not require a physician, appointment volume falls, and message backlogs grow. Too many, and payroll eats into margin the practice cannot easily get back. A published range gives a practice something to check its own staffing against, even though the range itself will not fit every practice equally well.

The published ranges

The numbers that show up most often in this literature are ranges, not fixed targets. Primary care practices are commonly cited at roughly 3 to 5 full-time-equivalent support staff per physician. Procedural specialties run higher, typically 4 to 6 FTE per physician.

Those ranges are wide on purpose. A ratio that fits a two-physician family medicine practice with outsourced billing will not fit an orthopedic group running its own imaging and physical therapy under one roof. The published number is a starting point for comparison, not a rule a practice can apply without adjustment. A practice that measures itself against the wrong end of the range, or against a single published midpoint, can end up chasing a target that was never meant to describe its situation.

What moves a practice up or down the range

• Specialty. Procedural work brings more prior authorization, more supply and instrument handling, and more recovery-area staffing than a typical primary care visit.
• In-house ancillary services. A practice running its own lab, imaging, or physical therapy needs staff for those functions on top of the front and back office.
• Check-in and scheduling complexity. A practice with a tight scheduling template, heavy no-show follow-up, or high prior-authorization volume needs more administrative staff per physician than one with straightforward scheduling.
• Billing model. A practice that bills in-house needs coders, billers, and collections staff on payroll. A practice that outsources billing removes that category from the ratio entirely.

Set every one of those factors at the low end and a practice lands near 3 FTE per physician. Set them at the high end and a practice can run past 6, even in primary care. Most of the spread in the published numbers comes from these four factors, not from inconsistent measurement.

The ratio you plan for is not the ratio you can hire

MGMA Stat polling on practice priorities for 2025 found staffing challenges named by roughly one in five leaders as a top concern. A separate poll went further: 53% of practice leaders identified candidate supply, simply not enough qualified applicants, as their single biggest staffing challenge. That is a different problem than turnover or cost. A practice can budget for a raise or write a retention plan. It cannot order up more candidates on a timeline it controls.

Medical assistants come up again and again in this research as the hardest role to fill. That role sits at the center of almost every staffing ratio calculation, in primary care and in specialty practices alike, which means the hardest number to hit is also the one the whole ratio depends on most. A practice can be fully staffed on the front desk and in billing, and still fall short of its target ratio because the medical assistant requisitions have sat open for months.

This is a change from how the benchmark ratio was traditionally used. For years, the main obstacle between a practice and its target ratio was budget: could the practice afford another 0.5 FTE of support staff. Budget is still a real constraint, but for a majority of practice leaders it is no longer the binding one. Candidate supply is.

What this means for planning

The benchmark ranges are still useful. They tell a practice roughly where it should land given its specialty, its ancillary services, and its billing model. What has changed is what a practice can do once it knows the target.

A ratio calculated from a spreadsheet assumes staff are available to hire at the number the spreadsheet produces. Given that over half of practice leaders cite candidate supply, not budget, as the constraint, a practice sitting in the middle of the published range should not assume open roles fill on a short timeline. Planning around the benchmark ratio increasingly means planning around a hiring pipeline rather than a hiring event.

• Recruit ahead of the need. A medical assistant opening tied to a new provider start date should post well before that date, not after it.
• Cross-train current staff. A front-desk employee or a billing employee trained to cover basic medical assistant tasks can absorb part of a gap while a role stays open.
• Phase added volume against realistic time-to-fill. A new service line or an added provider should ramp against a hiring timeline the practice has actually observed, not against the ratio alone.

A four-provider primary care practice sitting at 3.5 FTE per physician today, and planning to add a fifth provider, gains little from a plan that assumes it can hire two or three medical assistants in the same quarter the role opens. The published range still describes where the practice should land. It says less about how quickly it can get there, and in the current hiring market, that gap is the part worth planning around.