Brian Sebastian, MD

University	Degree	Focus	Graduated
Georgetown University School of Medicine	Medical Degree		Not Specified
Duke University School of Medicine	Medical Degree		1997

Institution	Focus	Year
Residency - Georgetown University Hospital/Washington Hospital Center Program		Not Specified
Residency - Georgetown University Hospital, St. Christopher's Hospital for Children		Not Specified
Residency - Georgetown University		Not Specified
Continuing Medical Education (CME) - GEORGETOWN UNIVERSITY HOSPITAL, WASHINGTON DC		2000
Continuing Medical Education (CME) - Georgetown University Hospital, Washington, DC, Internal Medicine		Not Specified

Certification	Cert. Body	Year
Internal medicine	Internal Medicine	Not Specified

Open full review

Review by Anonymous on October 04, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ I actually enjoyed it!... ”

I actually enjoyed it!

Verified Patient

“I actually enjoyed it!...”

I actually enjoyed it!

Anonymous 10/04/2025

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Review by Anonymous on June 20, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ Sebastian is a very good doctor.... ”

Sebastian is a very good doctor.

Verified Patient

“Sebastian is a very good doctor....”

Sebastian is a very good doctor.

Anonymous 06/20/2025

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Review by Anonymous on April 09, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ Thorough... ”

Thorough

Verified Patient

“Thorough...”

Thorough

Anonymous 04/09/2025

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Review by Anonymous on April 04, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ Dr Sebastian is Excellent!!! He... ”

Dr Sebastian is Excellent!!! He listens!!!

Verified Patient

“Dr Sebastian is Excellent!!! He...”

Dr Sebastian is Excellent!!! He listens!!!

Anonymous 04/04/2025

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Review by Anonymous on February 04, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ Excellent doctor... ”

Excellent doctor

Verified Patient

“Excellent doctor...”

Excellent doctor

Anonymous 02/04/2025

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Review by Anonymous on August 13, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ Dr Sebastian has been our Dr sin... ”

Dr Sebastian has been our Dr since he took over the practice. We are very happy with him.

Verified Patient

“Dr Sebastian has been our Dr sin...”

Dr Sebastian has been our Dr since he took over the practice. We are very happy with him.

Anonymous 08/13/2025

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Review by Anonymous on April 25, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ I always receive exceptional car... ”

I always receive exceptional care.

Verified Patient

“I always receive exceptional car...”

I always receive exceptional care.

Anonymous 04/25/2025

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Review by Anonymous on April 07, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ Dr.Sebastian isxcellent... ”

Dr.Sebastian isxcellent

Verified Patient

“Dr.Sebastian isxcellent...”

Dr.Sebastian isxcellent

Anonymous 04/07/2025

Open full review

Review by Anonymous on February 07, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ Excellent... ”

Excellent

Verified Patient

“Excellent...”

Excellent

Anonymous 02/07/2025

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Review by Anonymous on January 25, 2025 -

MarinHealth Primary Care | A UCSF Health Clinic (Sonoma) - 651 First Street West Suite H

Office & Staff Evaluation

Practice Evaluation

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Appearance & Atmosphere of Office Not rated
Handling of Billing & Insurance Not rated
Average Wait Time Not rated

Provider Evaluation

Willingness to Spend Time with You Not rated
Listening Skills
Clear explanations
Trust in Decision Making Not rated
Accuracy of Diagnosis Not rated
Post-Visit Follow-Up Not rated

Comment - “ Can't say enough good things abo... ”

Can't say enough good things about Dr Sebastian. And everyone in town agrees.

Verified Patient

“Can't say enough good things abo...”

Can't say enough good things about Dr Sebastian. And everyone in town agrees.

Anonymous 01/25/2025

Office Hours

Internal Medicine Physician - General

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Office & Staff Evaluation Not rated

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MarinHealth Primary Care | A UCSF Health Clinic

Practice Colleagues

Lawrence Huan, MD - Internal Medicine Physician

Robert Gleser, MD - Internal Medicine Physician

Carolyn Ho, MD, MPH - Family Medicine Physician

Geeta Malik, MD - Family Medicine Physician

Procedures & Services

Procedures & Treatments Offered

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Accepted Insurance

Accepted Insurance