MarinHealth Primary Care in Sonoma, CA | A UCSF Health Clinic
Family Practice • Sonoma, CA • Since 1952 • Multiple locations in North Bay locations
About
MarinHealth is a nonprofit health system based in Greenbrae, CA, serving Marin County and surrounding areas. Key points relevant to your query: - MarinHealth Medical Network: 125+ providers across 25 locations in the North Bay; practices are part of UCSF Health through a strategic alliance. - Primary care presence: The network includes primary care services across Marin, Sonoma, and Napa Counties, with offices aimed at convenient, comprehensive care. - UCSF affiliation: Through the MarinHealth–UCSF alliance, many MarinHealth primary care and specialty services align with UCSF Health, supporting referrals and coordinated care. - Location context: HQ and main medical center are in Greenbrae (250 Bon Air Road, Greenbrae, CA 94904); multiple offices across the North Bay region. If you’re specifically looking for a MarinHealth primary care clinic in Sonoma, CA under the UCSF Health umbrella, the network’s Sonoma locations and affiliated UCSF primary care providers would be the most relevant options to explore for care coordination and potential UCSF-affiliated services.
Clinic Type
Family Practice
Address
250 Bon Air Road, Greenbrae, CA 94904, US
Phone
415-514-6000
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Opening Hours
Not published — contact the clinic to confirm hours.
Telehealth
Available for appointments
Emergency Care
9-1-1 in life-threatening emergencies; closest Emergency Room
Services Offered
Technology & Equipment
Team
Insurance & Payment
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Languages Spoken
FAQs
Do you offer telehealth appointments?
Yes, telehealth appointments are available.
Is there an on-call physician after hours?
Yes, there is always a physician on-call after hours.
What Patients Say
Overall sentiment across review platforms: positive
- Healthgrades (Dr. Brian Sebastian): 4.5/5 (51)
- WebMD (Dr. Brian Sebastian): 4.5/5 (28 (ratings) / 14 (reviews))
Patients praise
- attentive listening skills
- professional and caring demeanor
- thorough approach to medical care
- effective communication and explanation of treatments
- efficient and friendly office staff
Common complaints
- occasional patient dissatisfaction with specific office interactions (though representing a minority of ratings)
"Dr. Sebastian is both personal and professional. He thinks and discusses."
— Healthgrades"Dr. Sebastian was very attentive, listened to my symptoms I noted, gave me complete information about treatment for my symptoms. Dr. Sebastian is always friendly, prompt and professional."
— WebMDSynthesized from public review platforms as of Jul 10, 2026 — sources: [1][2][3][4].
In the News
- MarinHealth Medical Network Primary Care Provider Availability — Jun 29, 2026
- MarinHealth Primary Care | A UCSF Health Clinic — Jul 5, 2026
- Marinhealth Infectious Disease A UCSF Health Clinic - Healthgrades — Jan 9, 2026
- RN - Pediatrics in Sonoma at MarinHealth Primary Care A UCSF Health Clinic | Apply now! – StudySmarter – Talents
- Información sobre el Distrito Sanitario | Sonoma Valley Hospital
Information sourced from the clinic's website as of July 10, 2026.
More family practice clinics in Sonoma
Sonoma Valley Hospital is a private healthcare district and hospital in Sonoma, California (HQ at 347 Andrieux Street). The facility offers a broad range of medical services including family practice, preventive/wellness care, cardiopulmonary services, women’s health, gastroenterology, general and orthopedic surgery, internal medicine, cataract surgery, surgical weight loss, total joint replacement, chronic/long-term care, hospice, skilled nursing, and rehabilitation, plus emergency services. The hospital has about 51 beds and a staff of around 74 employees. It has a history dating back to 1945, with the current hospital opening in 1957 and expansions in the 1970s; obstetrics services were closed in 2018 due to declining births. Phone: administration@sonomavalleyhospital.org. Website: sonomavalleyhospital.org.
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