Graybill Medical Group. 225 East Second Avenue. Escondido, CA 92025. (760) 291-6700. www.graybill.org. TTY/Relay Service Information. If you have a TTY device, please call (760) 291-6857. If you DO NOT have a TTY device, please call 711 or visit the California Public Utilities Commission web site for more information. Urgent Care..