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Dr. Merrigan graduated from the Medical College of Wisconsin,Medical College of Wisconsin in 1995. He works in Walnut Creek, CA and 3 other locations and specializes in Family Medicine.


Dr. Merrigan's Rating
Patient Perspective
1.0 Explains conditions and treatments
1.0 Takes time to answer my questions
1.0 Provides follow-up as needed
Office Rating
Showing ratings for:
320 Lennon Ln, Walnut Creek, CA, 94598
n/a Average office wait time
1.0 Office cleanliness
1.0 Courteous staff
1.0 Scheduling flexibility
The Permanente Medical Group Inc Park Shadelands Medical Offices
320 Lennon Ln
Walnut Creek, CA, 94598
Showing 1-1 of 1 review
"After my Kaiser doctor of 20 years retired, I chose Dr. Timmothy Merrigan at Kaiser Park Shadelands to replace him. After seeing him several times, I can report that Dr. Merrigan is definitely the worst doctor I have ever encountered. He is dismissive, uninformed, and intellectually lazy. He doesn't even put in the effort to pretend to care. "
  • March 25, 2024


320 Lennon Ln
Walnut Creek, CA, 94598
  • Medicare Accepted
Mon8:30 am - 5:00 pm
Tue8:30 am - 5:00 pm
Wed8:30 am - 5:00 pm
Thu8:30 am - 5:00 pm
Fri8:30 am - 5:00 pm
  • Medicare Accepted
Kaiser Permanente Walnut Creek Medical Center
1425 S Main St
Walnut Creek, CA, 94596
1601 Ygnacio Valley Rd
Walnut Creek, CA, 94598
Kaiser Permanente San Leandro Medical Center
2500 Merced St
San Leandro, CA, 94577
Kaiser Permanente Medical Group
Kaiser Permanente Antioch Medical Center
4501 Sand Creek Rd
Antioch, CA, 94531



Medical School
Medical College Of Wisconsin
Graduated 1995
Medical College Of Wisconsin
Kaiser Permanente Medical Center


Please verify insurance information directly with your doctor's office as it may change frequently.
  • Kaiser Permanente
  • California - Northern
  • Senior Advantage Medicare Cost
  • Kaiser Permanente California - Northern
  • Kaiser Permanente - Northern CA HMO


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