Contra Costa Sleep Center 1700 Ygnacio Valley Rd, Walnut Creek, CA94598 Located in Walnut Creek, the Contra Costa Sleep Center is a full-service medical center devoted to comprehensive sleep…More medicine. The center offers diagnostic studies and sleep disorder therapy and is open 24 hours a day. The center is affiliated with the John Muir/Mt. Diablo Health system.
Douglas W. Zlock, M.D. 2255 Ygnacio Valley Rd, Walnut Creek, CA94598 Dr. Douglas W. Zlock is a board-certified endocrinologist with an office located in Walnut Creek. He…More specializes in the treatment of diabetes and the study of metabolism. Dr. Zlock is a published author on the subject of the thyroid and its deficiencies; he is a member of the staff at both the Mt. Diablo and John Muir medical centers.