The primary aim of the current study was to obtain information about the longitudinal clinical functioning of primary care patients who had received care from behavioral health consultants (BHCs) integrated into a large family medicine clinic. Global mental health functioning was measured with the 20-item self-report Behavioral Health Measure (BHM), which was completed by patients at all appointments with the BHC. The BHM was then mailed to 664 patients 1.5 to 3 years after receipt of intervention from BHCs in primary care, of which 70 (10.5%) were completed and returned (62.9% female; mean age 43.1 ± 12.7 years; 48.6% Caucasian, 12.9% African American, 21.4% Hispanic/Latino, 2.9% Asian/Pacific Islander, 10.0% Other, 4.3% no response). Mixed effects modeling revealed that patients improved from their first to last BHC appointment, with gains being maintained an average of 2 years after intervention. Patterns of results remained significant even when accounting for the receipt of additional mental health treatment subsequent to BHC intervention. Findings suggest that clinical gains achieved by this subset of primary care patients that were associated with brief BHC intervention were maintained approximately 2 years after the final appointment.