From Frisco: Take SH 121 to Coit Road. Turn south onto Coit. Drive through the light at McDermott Drive. Turn right into the CNVH parking lot, shared by the Allergy & Asthma Center.

From Dallas: Take Central Expwy or Dallas North Tollway north to Legacy Drive exit in Plano. From Central turn left at Legacy (west). From Tollway turn right at Legacy (east). From Legacy, turn north onto Coit Road. Pass through the light at Hedgcoxe Drive. Drive past Coit North Veterinary Hospital on your left. Turn left (west) at McDermott Drive. Turn into the CNVH parking lot, shared by the Allergy & Asthma Center.