SITEMAP Home About Dr. Koss Osteopathy Contact Us Sitemap Richard W. Koss D.O., PLLC 23220 Maple Valley HwySuite #101Maple Valley, WA 98038 Get Directions Write A Review Contact Phone: 425-433-6073Fax: 425-433-6074Email: rwkossdo@comcast.net Hours Monday - Friday: 10 AM - 6 PM FollowFollow