Generalist versus Subspecialist Workforce Characteristics of Invasive Procedures Performed by Radiologists.

Purpose To explore subspecialty workforce considerations surrounding invasive procedures performed by radiologists. Materials and Methods The 2015 Centers for Medicare & Medicaid Services Physician and Other Supplier Public Use File was used to identify all invasive procedures (Current Procedural Terminology code range, 10000-69999) billed by radiologists for Medicare fee-for-service beneficiaries. Radiologists were categorized by subspecialty according to the majority of their billable work-relative value units (wRVUs). Those without a single subspecialty majority work effort were deemed generalists. Procedures were categorized into three tiers of complexity (high, ≥4.0 wRVUs; mid, 1.6-3.9 wRVUs; low, ≤1.5 wRVUs). Total and tiered generalist versus subspecialist workforce composition was assessed. Results Just 25 unique services comprised more than 75% of invasive procedures performed by radiologists. Of radiologists who performed procedures, 57.5% were generalists, 15.8% were interventionalists, and 26.8% were other subspecialists. Of the radiologists who performed low-, mid-, and high-complexity procedures, generalists accounted for 46.3%, 30.9%, and 23.1%, respectively; interventionalists accounted for 35.4%, 30.9%, and 75.2%, respectively; and other subspecialists accounted for 18.3%, 14.6%, and 1.7%, respectively. Generalists were the dominant providers of six of the top 10 low-complexity and seven of the top 10 midcomplexity procedures. Interventionalists were the dominant providers of all top 10 high-complexity procedures. Nationally, over twice as many U.S. counties had local access to generalists (869 counties) for invasive procedures versus interventionalists (347 counties) or other subspecialists (380 counties). Conclusion Among radiologists, generalists perform far more procedures in more geographic locations and are more likely to serve patients with less complex service needs than are interventionalists or other subspecialists. Practices and professional societies must remain vigilant to ensure that the subspecialty evolution in radiology does not exacerbate patient access disparities. © RSNA, 2018 Online supplemental material is available for this article.