The Impact of the New York Nurse Practitioner Modernization Act on the Employment of Nurse Practitioners in Primary Care.

Expanding scope of practice (SOP) for nurse practitioners (NPs) may increase NP employment in primary care practices which can help meet the growing demand in primary care. We examined the impact of enacting less restrictive NP practice restrictions-NP Modernization Act-in New York State (NYS) on the overall employment of primary care NPs and specifically in underserved areas. We used longitudinal data from the SK&A outpatient database (2012-2018) to identify primary care practices in NYS and in the comparison states (Pennsylvania [PA] and New Jersey [NJ]). Using a difference-in-differences design with an event study specification, we compared changes in (1) the presence and (2) total counts of NPs in primary care practices in NYS and neighboring comparison states (ie, PA and NJ) before and after the policy change. The NP Modernization Act was associated with a 1.3 percentage point lower probability of a practice employing at least one NP on average across each of the 3 post-periods (95% CI: -.024, -.002). NP Modernization Act was associated with 0.065 fewer NPs on average across the post-period (95% CI: -.119, -.011). Results were similar in underserved areas. NP employment in primary care practices in NYS was lower after the NP Modernization Act than would have been expected based counterfactual of comparison states. The negative relationship may be explained by gains in provider efficiency which leads to reduced NP hiring in primary care. More research is needed to understand the relationship between SOP regulations, NP supply, and access to care.