Racial and Ethnic Concordance Between National Health Service Corps Clinicians and Underserved Populations.

Importance: Despite the widely recognized importance of racial and ethnic concordance between patients and clinicians, there is a lack of studies on clinician diversity in medically underserved areas and whether it aligns with the changing demographic landscape.

Objective: To assess trends in National Health Services Corps (NHSC) clinician diversity and racial and ethnic concordance between NHSC clinicians and the populations in underserved areas from before to after the 2009 NHSC expansion.

Design, Setting, And Participants: This cross-sectional, population-based study compared trends in the diversity of NHSC clinicians practicing in health professional shortage areas (HPSAs) and the HPSA populations during 2003 to 2019 using the Health Resources and Services Administration's NHSC Field Strength Database and Area Health Resources Files. The analysis was performed from February through May 2023.

Main Outcomes And Measures: Concordance was measured with an annual community representativeness ratio defined as the ratio of the proportions of same race or ethnicity NHSC clinicians to HPSA population.

Results: There were a total of 41 180 clinicians practicing in HPSAs from 2003 to 2019; the median (IQR) age was 34 (30-41) years. Among 38 569 NHSC clinicians who reported gender, 28 444 (73.7%) identified as female and 10 125 (26.3%) identified as male. The average annual number of NHSC clinicians increased from 3357 in 2003 to 2008 to 9592 in 2009 to 2019. Before 2009, 1076 clinicians (5.3%) identified as Black, 9780 (48.6%) as Hispanic, 908 (4.5%) as other, and 8380 (41.6%) as White. During this period, concordance was low among non-Hispanic White and Black individuals due to clinician underrepresentation relative to the population, yet Hispanic clinicians were overrepresented. Following the 2009 NHSC expansion, the main change was the sharp decline in the proportion of Hispanic clinicians, to 1601 (13%) by 2019; while concordance was achieved for non-Hispanic White and Black individuals, Hispanic clinicians became underrepresented relative to population. The results held across 3 specialties: primary care, mental health care, and dental care.

Conclusions And Relevance: This cross-sectional study of trends in racial and ethnic concordance found that while the NHSC expansion starting in 2009 improved clinician-population concordance for non-Hispanic White and Black individuals, it reversed a prior trend for Hispanic individuals among whom clinicians became underrepresented relative to the population. Targeted NHSC clinician recruitment efforts are needed to improve concordance for Hispanic individuals in underserved areas, especially given Hispanics' projected growth in the US.