A bit farther than Walnut Creek but still in the John Muir network: I've been really impressed by the office of Drs. Mary Sears, Michelle Bricker, and another lady doc whose name I can't remember offhand. My neighbor sees Dr. Bricker and highly recommended the office. Dr. Bricker wasn't accepting new patients at the time but Dr. Sears was, and I've been very impressed by how conscientious, warm, helpful, and courteous the doctors, nurse-practitioner, office staff, and nurses are. They take time to answer your questions, are awesome in prompt follow-up calls if you have lab results, and all in all make you feel very well cared for.
the office location and phone # are:
140 Brookwood Rd
Orinda, CA 94563-3042
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Located just off the Orinda freeway exit.