ObjectiveTo describe patient differences by prenatal care (PNC) model and identify factors that interact with race to predict more attended prenatal appointments, a key component of PNC adherence.MethodsThis retrospective cohort study used administrative data targeting prenatal patient utilization from two OB clinics with different care models (resident vs. attending OB) from within one large midwestern healthcare system. All appointment data among patients receiving prenatal care at either clinic between September 2, 2020, and December 31, 2021, were extracted. Multivariable linear regression was performed to identify predictors of attended appointments within the resident clinic, as moderated by race (Black vs. White).ResultsA total of 1034 prenatal patients were included: 653 (63%) served by the resident clinic (appointments = 7822) and 381 (38%) by the attending clinic (appointments = 4627). Patients were significantly different across insurance, race/ethnicity, partner status, and age between clinics (p< 0.0001). Despite prenatal patients at both clinics being scheduled for approximately the same number of appointments, resident clinic patients attended 1.13 (0.51, 1.74) fewer appointments (p= 0.0004). The number of attended appointments was predicted by insurance in crude analysis (β= 2.14,p< 0.0001), with effect modification by race (Black vs. White) in final fitted analysis. Black patients with public insurance attended 2.04fewerappointments than White patients with public insurance (7.60 vs. 9.64) and Black non-Hispanic patients with private insurance attended 1.65moreappointments than White non-Hispanic or Latino patients with private insurance (7.21 vs. 5.56).ConclusionOur study highlights the potential reality that the resident care model, with more care delivery challenges, may beunderservingpatients who are inherently more vulnerable to PNC non-adherence at care onset. Our findings show that patients attend more appointments at the resident clinic if publicly insured, but less so if they are Black than White.