Counting physicians is easy (well, kind of). Knowing what their FTEs actually deliver is not.

Most health systems still build workforce plans on a single, deceptively simple unit of measurement: the FTE. Adjustments are sometimes made for part-time status, but the rest of the calculation typically stops there. The result is a workforce plan that treats every 1.0 FTE as equivalent, regardless of specialty, productivity, or available clinical capacity. It is a habit that quietly distorts nearly every downstream decision a health system makes about access.

3Dhealth’s Provider Development Planning methodology takes a different path. Through our actuarial calculation, every physician in a market is converted from a nominal headcount into a true clinical FTE – one that reflects their part-time or full-time status, any administrative, teaching, or research duties, and their available clinical capacity benchmarked against specialty-specific productivity percentiles. The output is not a head, but a measure of clinical reach.

That calculation matters, and it is the necessary foundation for everything that follows. But it is not where the planning challenge ends. It is where the FTE Fallacy begins.

The Fallacy is the assumption that three properly adjusted clinical FTEs – one in Endocrinology, one in Family Medicine, one in Orthopedic Surgery – deliver comparable access to a community. They do not. They never have. And the data make the variation impossible to ignore.

The Fallacy Is Not in the FTE. It Is in the Comparison.

Once a health system has produced a clean, properly adjusted clinical FTE for every physician in its market, the natural temptation is to treat that FTE as a universal currency. A 1.0 clinical FTE in Cardiology and a 1.0 clinical FTE in Pediatrics look the same in the staffing model. They sum cleanly. They forecast cleanly. They support clean ratio comparisons against community need.

And yet, the access those two FTEs deliver to a community is not remotely the same.

Specialty-specific capacity benchmarks vary by a factor of three or more. A median-productivity Family Medicine FTE delivers approximately 3,265 office visits per year. A median Pediatrics FTE delivers about 3,548. A median Dermatology FTE delivers 5,321. A median General Surgery FTE delivers 1,730. A Cardiac Surgery FTE, whose visit-based capacity is structurally low because most of the specialty’s work occurs in the operating room, requires benchmarking at the 90th percentile to produce a stable expectation of roughly 1,463 visits per year.

These are not anomalies. They are the productivity reality of modern medicine. Different specialties operate under different visit cadences, different procedure-to-office-visit ratios, and different practice models. A 1.0 clinical FTE is an honest measure of clinical time available. It is not, by itself, a measure of access produced.

Speed Compounds the Variation

Capacity tells one part of the story. Access velocity tells another, and it travels in the same direction.

3Dhealth’s national outbound call dataset, drawn from more than 101,000 physician contacts across 244 health systems, documents median new-patient wait times by specialty at the point of contact. The variation is dramatic, and it is structural:

“Accepting” does not mean accessible.

Two 1.0 clinical FTEs, both properly adjusted, both fully open, can deliver fundamentally different patient experiences. A Family Medicine FTE at a 15-day median is sitting at the edge of what consumers will tolerate. (3Dhealth research shows that 55% of consumers expect a new-patient primary care appointment within four days or fewer.) An Endocrinology FTE at a 38-day median is operating in an entirely different reality. Both are clinical FTEs. Both contribute to the staffing model. Neither delivers the same kind of access.

“The FTE is the most useful unit in workforce planning, but only after it has been properly adjusted, and only when its specialty context is preserved. Strip away either of those, and you are not planning for access. You are counting heads with extra decimal places.”— Ron Flower, President & CEO, 3Dhealth

Served Lives Make the Variation Concrete

Visit capacity and wait time describe physician throughput and physician speed. Served Lives describe physician reach – the actual patient panel a clinical FTE can manage. And the variation here, again calibrated through actuarial inference rather than attribution, is decisive.

3Dhealth’s Served Lives methodology infers true panel size from physician productivity, not from attribution windows or care-team rosters. The output is a defensible measure of how many patients a clinical FTE is actually managing. Across specialties, the variation is structural rather than behavioral.

In General Primary Care, a median-productivity physician serves approximately 1,300 patients, with 75th-percentile physicians serving roughly 1,700. In Obstetrics and Gynecology, the median climbs to over 3,000 patients, with 75th-percentile physicians serving more than 4,100. Pediatrics presents a different pattern altogether: higher annual visit volume (3,000 to 7,000 visits per year between the 25th and 75th percentiles) but tighter panel ranges of 1,100 to 1,700 patients, driven by the frequency of well-child visits.

Three implications follow:

• A 1.0 OB/GYN FTE manages a patient panel roughly two and a half times the size of a 1.0 primary care FTE, but those panels are not interchangeable. They serve different patient groups with different needs and different visit cadences.
• Hiring decisions framed in headcount terms (“we need three more physicians”) systematically obscure what each hire is expected to enable in terms of community reach.
• Workforce shortages that look uniform on a headcount basis often look very different when expressed in Served Lives. The same vacancy in two specialties can represent vastly different access losses for the community.

Even an Employed FTE Is Not Always an Available One

There is one more layer to the FTE Fallacy worth naming. Employed physicians are often presumed to operate under tighter network management, with panels actively kept open as a matter of system policy. The data say otherwise.

Within 3Dhealth’s national outbound call dataset, employed primary care physicians show an open-practice rate of 71.8% and a closed-practice rate of 24.0%. Employed specialists, by contrast, are open 88.6% of the time, with only 5.9% closed. The closure rate among employed primary care FTEs is more than four times that of employed specialist FTEs.

Two properly adjusted 1.0 clinical FTEs, both employed by the same health system, can present very different access realities to the community. One may function as an accessible community asset. The other may have been quietly closed to new patients for months. Both continue to count as full clinical FTEs in the workforce plan, but only one is functioning as one in the eyes of the patient.

Planning for What Each FTE Actually Enables

A more useful workforce model treats each properly adjusted clinical FTE as a defined bundle of access outputs, not a single integer. In our work with health systems, we evaluate each clinical FTE across four operational realities:

• Throughput. Specialty-specific visit capacity per FTE, calibrated against productivity percentiles rather than headcount targets.
• Reach. Served Lives per FTE, derived actuarially from local patient demographics.
• Speed. Median new-patient wait time at the point of contact, the specialty’s actual access velocity profile.
• Availability. Open-practice rate, the probability that the FTE is functioning as an accessible asset rather than a closed one.

When these four dimensions are evaluated together, by specialty, a health system can plan for the access it actually wants, not just the headcount it can afford. The same investment that produces a single Endocrinology FTE may, depending on local conditions, produce far greater community access if redirected toward unlocking access velocity within an already-employed specialty group, or toward expanding APP utilization in primary care.

That analytic shift is the practical answer to the FTE Fallacy. Workforce planning becomes less about filling specialty slots and more about defining the access function each clinical FTE is expected to perform, then selecting the specialty, deployment model, and operating design that delivers that function.

Why This Matters Now

The national physician shortage, projected to reach 101,000 by 2030, will not be solved by recruitment alone, particularly in rural markets, where 62% of the shortage is projected to concentrate by 2040. Even if every open recruitment requisition in the country were filled tomorrow, the FTE Fallacy would continue to undermine access if those new physicians were planned for and deployed under the assumption that one adjusted clinical FTE is interchangeable with another.

The systems that will navigate the next decade most successfully are those that treat workforce planning as an access strategy rather than a headcount exercise. That means knowing, with precision, what each specialty FTE actually enables in their market. It means understanding where existing FTEs are underperforming relative to that potential. And it means making targeted investments in panel design, scheduling architecture, APP integration, and Served Lives optimization, before defaulting to recruitment.

Hiring is one lever. It is not the only one, and in many specialties, it is not the most efficient one.

Beyond the Headcount

The FTE is not the problem. Treating it as a universal currency is.

A properly adjusted clinical FTE, calibrated against specialty-specific capacity benchmarks and translated into Served Lives, is one of the most powerful units in modern healthcare planning. But its power lies in its specificity, not its uniformity. The moment a system assumes that all clinical FTEs deliver equivalent access, the rigor of the adjustment is undone.

At 3Dhealth, our Provider Development Planning methodology preserves that specificity throughout the planning process. Served Lives, Access Velocity, and panel-status data together produce a more accurate, more defensible, and more actionable picture of what each clinical FTE actually delivers, and what each new FTE would actually add. The result is workforce planning that does what the FTE convention promised but rarely achieved: a clear, quantified line from staffing decisions to community access.

The systems that recognize the difference will plan better. Their communities will get more access. And the same dollars will go further.

For questions or more information, please contact:
Ron Flower at RFlower@3Dhealthinc.com or 312-423-2673. To schedule an appointment with Ron, please contact Annalisa Reese at AReese@3Dhealthinc.com.