Tri-Valley Internal Medicine Group Internal Medicine, Geriatrics is their Medial specialty. Tri-Valley Internal Medicine Group is located on 29738 Rancho California Rd B 102 in Temecula. They can be reached by phone by calling (951) 894-4665 . They can be reached by calling (951) 894-4665 . They have not yet been reviewed on MojoPages.com.