We do not have the adequate resources at this time to test in our clinic. There will be drive-thru testing centers soon in the community. The testing will only be for people WITH symptoms (fever, cough) or known contacts. Information is likely to change.

Please call us for advice if you need hel...

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Heather LeSieur PA-C
She started to work with CVMG in March 2015 after many years of being a PA in Utah. She had her training at UMDNJ/Rutgers in Piscataway, NJ after completing a Masters in Public Health at the University of Utah. Heather loves family medicine because of the camaraderie and th...

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Dr. Tomsky (Corvalan) graduated from the Mercy Methodist Residency program in Sacramento, CA affiliated with USC. She joined Clayton Valley Medical Group in August 2004. She came to the United States in 1994 after graduating from Medical School at Charles University, Prague, Czech...

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Dr. Kaplan is a 1979 graduate of the University of California at Irvine, a 1985 graduate of the Stanford Graduate School of Business and a 1987 graduate of Stanford Medical School. His study interests have included preventive medicine and health services strategic planning. Afte...

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3 months ago
Doctor Le Sieur was awesome! Friendly, quick, and knowledgeable. Really helpful and I felt like she genuinely cares about her patients and wants the best for them
- Ben D
5 months ago
Patient and understanding caregivers in a good practice near my house. I like the fact that I can always get an appointment when I need one and that they are efficient and listen to what I have to say. I'm a retired paramedic so I know how doctors can be. If you need just a general practitioner, you can definitely do a lot worse than these folks.
- Dana H
a year ago
They are an outstanding staff. I'm so thankful to have found them years ago after my doctor retired. They all work together!!
- pat p

Family Practice

We provide care for chronic diseases like asthma, diabetes and hypertension. We provide preventive services for all ages. We also provide acute illness or injury care. 

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  • (925) 672-6744


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5439 Clayton Road Suite B
Clayton, CA 94517

Business Hours

Mon:8:00 AM – 5:00 PM
Tue:8:00 AM – 5:00 PM
Wed:8:00 AM – 5:00 PM
Thu:8:00 AM – 5:00 PM
Fri:8:00 AM – 5:00 PM
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