We report weighted percentages of physicians who accepted new patients by insurance type and year. We examined the relationship between acceptance of new patients with Medicare, Medicaid, private capitated insurance, private noncapitated insurance, self-pay patients, and year of participation in the program. Linear regression was used to estimate trends over time adjusting for practice size, physician ownership status, type of office, physician specialty, and location. Stratified analyses were performed to understand differences in acceptance of new patients by physician specialty and practice type. Analyses were performed using Stata statistical software, version 11.0 (StataCorp, College Station, Texas).