Procedure Volume Patient Data Patient Conditions Reviews General Payments Back to Top

Home > CA Providers > Internists & Internal Medicine Doctors

Dr. Brian Martin Sebastian, MD

Accepting New Patients

(6 Ratings)

Specializes in: Internal Medicine (Adult Medicine)

Duke University School of Medicine

651 First Street West Suite H
Sonoma, CA 95476

(707) 938-3870

Dr. Brian Martin Sebastian, MD is an internist in Sonoma, CA specializing in internal medicine (adult medicine). He graduated from Duke University School of Medicine. Dr. Brian Martin Sebastian, MD is affiliated with Marin General Hospital and Hill Physicians.

Office Locations

651 First Street West Suite H
Sonoma, CA 95476

open_in_new

Hill Physicians

651 1st Street
West Ste H Sonoma, CA 95476

(707) 938-3870

open_in_new

In The News

“Liz Hafalia/The Chronicle Show More Show Less 2 of 12 Dr. Brian Sebastian experiments with Google Glass when seeing patients in Sonoma, California, on Thursday, October 17, 2013.”—"Startups see healthy future for Google Glass in medicine", SFGATE, February 2014

Noteworthy Medicare Patient Procedures Performed by Dr. Brian Martin Sebastian, MD in 2023

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 5%

By Volume:

flu shot

preventive care

In 2023, Dr. Brian Martin Sebastian, MD performed more flu shot, and preventive care procedures for Medicare patients than 95% of providers in related specialties within California.

Top 10%

By Volume:

A1C test

In 2023, Dr. Brian Martin Sebastian, MD performed more A1C test procedures for Medicare patients than 90% of providers in related specialties within California.

Top 25%

By Volume:

lab tests

In 2012, Dr. Brian Martin Sebastian, MD performed more lab tests procedures for Medicare patients than 75% of providers in related specialties within California.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2012 were preventive care, lab tests, vaccines and nursing home care.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

cardiac procedures	11
diabetes management	244
doctor visit	1686
ear procedures	31
lab tests	297
nursing home care	254
preventive care	545
removal of lesion (e.g. growth)	12
skin procedures	12
vaccines	273

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2013 were preventive care, lab tests, vaccines and diabetes management.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

diabetes management	249
doctor visit	1869
ear procedures	18
lab tests	316
nursing home care	154
preventive care	562
removal of lesion (e.g. growth)	20
skin procedures	20
vaccines	296

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	249
Female	299

**Ethnicity**
Non-Hispanic White	510
Black	0
Hispanic	20
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	244
From 75 to 84	169
85 and over	114
Less than 65	21

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2013

Hypertension	61
High Cholesterol	49
Stroke	3
Ischemic Heart Disease	25
Depression	9
Chronic Kidney Disease	14
Asthma	6
Osteoperosis	2
Atrial Fibrilation	13
Heart Failure	15
Chronic Obstructive Pulmonary Disease	5
Diabetes	18
Dementia	11
Cancer	7

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2014 were preventive care, vaccines, lab tests and diabetes management.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

diabetes management	236
doctor visit	2037
ear procedures	15
lab tests	301
nursing home care	99
preventive care	659
removal of lesion (e.g. growth)	45
skin procedures	45
vaccines	406

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	296
Female	333

**Ethnicity**
Non-Hispanic White	585
Black	0
Hispanic	19
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	311
From 75 to 84	184
85 and over	109
Less than 65	25

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2014

Hypertension	57
High Cholesterol	45
Stroke	3
Ischemic Heart Disease	25
Depression	13
Chronic Kidney Disease	13
Asthma	6
Osteoperosis	2
Atrial Fibrilation	10
Heart Failure	14
Chronic Obstructive Pulmonary Disease	7
Diabetes	16
Dementia	8
Cancer	8

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2015 were preventive care, vaccines, lab tests and diabetes management.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

cardiac procedures	12
diabetes management	248
doctor visit	2069
ear procedures	24
lab tests	326
nursing home care	91
preventive care	969
removal of lesion (e.g. growth)	32
skin procedures	32
vaccines	686

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	646
Female	706

**Ethnicity**
Non-Hispanic White	1254
Black	0
Hispanic	42
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	664
From 75 to 84	412
85 and over	228
Less than 65	48

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2015

Hypertension	58
High Cholesterol	57
Stroke	3
Ischemic Heart Disease	26
Depression	12
Chronic Kidney Disease	17
Asthma	8
Osteoperosis	2
Atrial Fibrilation	12
Heart Failure	14
Chronic Obstructive Pulmonary Disease	7
Diabetes	15
Dementia	8
Cancer	9

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2016 were preventive care, vaccines, lab tests and diabetes management.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

diabetes management	236
doctor visit	1986
ear procedures	25
lab tests	326
nursing home care	68
preventive care	686
removal of lesion (e.g. growth)	15
skin procedures	15
vaccines	435

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	316
Female	386

**Ethnicity**
Non-Hispanic White	653
Black	0
Hispanic	18
Asian	0
Other	18
Native American	0

**Age**
From 65 to 74	345
From 75 to 84	213
85 and over	123
Less than 65	21

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2016

Hypertension	54
High Cholesterol	39
Stroke	2
Ischemic Heart Disease	24
Depression	14
Chronic Kidney Disease	19
Asthma	10
Osteoperosis	2
Atrial Fibrilation	14
Heart Failure	13
Chronic Obstructive Pulmonary Disease	6
Diabetes	14
Dementia	10
Cancer	8

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2017 were preventive care, vaccines, lab tests and diabetes management.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

breathing treatment	20
diabetes management	221
doctor visit	1872
ear procedures	28
lab tests	314
nursing home care	110
preventive care	676
removal of lesion (e.g. growth)	19
skin procedures	19
vaccines	433

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	313
Female	354

**Ethnicity**
Non-Hispanic White	616
Black	0
Hispanic	19
Asian	0
Other	21
Native American	0

**Age**
From 65 to 74	319
From 75 to 84	218
85 and over	113
Less than 65	17

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2017

Hypertension	55
High Cholesterol	25
Stroke	4
Ischemic Heart Disease	24
Depression	15
Chronic Kidney Disease	22
Asthma	6
Osteoperosis	3
Atrial Fibrilation	12
Heart Failure	11
Chronic Obstructive Pulmonary Disease	6
Diabetes	14
Dementia	10
Cancer	7

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2018 were preventive care, vaccines, lab tests and diabetes management.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

diabetes management	278
doctor visit	1903
ear procedures	36
lab tests	374
nursing home care	87
preventive care	705
removal of lesion (e.g. growth)	29
skin procedures	29
vaccines	409

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	323
Female	337

**Ethnicity**
Non-Hispanic White	608
Black	0
Hispanic	0
Asian	0
Other	23
Native American	0

**Age**
From 65 to 74	302
From 75 to 84	229
85 and over	112
Less than 65	17

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2018

Hypertension	55
High Cholesterol	51
Stroke	4
Ischemic Heart Disease	25
Depression	16
Chronic Kidney Disease	20
Asthma	6
Osteoperosis	4
Atrial Fibrilation	14
Heart Failure	13
Chronic Obstructive Pulmonary Disease	7
Diabetes	12
Dementia	10
Cancer	9

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2019 were preventive care, lab tests, vaccines and diabetes management.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

diabetes management	309
doctor visit	1790
lab tests	381
nursing home care	49
preventive care	659
removal of lesion (e.g. growth)	14
skin procedures	14
vaccines	336

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	315
Female	316

**Ethnicity**
Non-Hispanic White	585
Black	0
Hispanic	0
Asian	0
Other	22
Native American	0

**Age**
From 65 to 74	287
From 75 to 84	222
85 and over	110
Less than 65	12

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2019

Hypertension	57
High Cholesterol	55
Stroke	3
Ischemic Heart Disease	26
Depression	15
Chronic Kidney Disease	23
Asthma	6
Osteoperosis	4
Atrial Fibrilation	13
Heart Failure	13
Chronic Obstructive Pulmonary Disease	6
Diabetes	13
Dementia	9
Cancer	9

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2020 were preventive care, lab tests, diabetes management and vaccines.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

diabetes management	251
doctor visit	1449
lab tests	297
preventive care	464
removal of lesion (e.g. growth)	17
skin procedures	17
vaccines	213

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	297
Female	279

**Ethnicity**
Non-Hispanic White	531
Black	0
Hispanic	0
Asian	0
Other	23
Native American	0

**Age**
From 65 to 74	248
From 75 to 84	213
85 and over	102
Less than 65	13

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2020

Hypertension	53
High Cholesterol	55
Stroke	4
Ischemic Heart Disease	26
Depression	19
Chronic Kidney Disease	21
Asthma	6
Osteoperosis	3
Atrial Fibrilation	13
Heart Failure	12
Chronic Obstructive Pulmonary Disease	6
Diabetes	13
Dementia	7
Cancer	9

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2021 were preventive care, lab tests, diabetes management and vaccines.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

diabetes management	284
doctor visit	1524
lab tests	318
preventive care	517
vaccines	233

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	277
Female	250

**Ethnicity**
Non-Hispanic White	482
Black	0
Hispanic	0
Asian	0
Other	23
Native American	0

**Age**
From 65 to 74	205
From 75 to 84	212
85 and over	99
Less than 65	11

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2021

Hypertension	55
High Cholesterol	61
Stroke	3
Ischemic Heart Disease	26
Depression	18
Chronic Kidney Disease	21
Asthma	7
Osteoperosis	4
Atrial Fibrilation	14
Heart Failure	12
Chronic Obstructive Pulmonary Disease	6
Diabetes	12
Dementia	6
Cancer	11

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA during 2022 were preventive care, lab tests, diabetes management and vaccines.

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

diabetes management	274
doctor visit	1630
lab tests	331
preventive care	411
vaccines	137

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	330
Female	299

**Ethnicity**
Non-Hispanic White	580
Black	0
Hispanic	0
Asian	0
Other	23
Native American	0

**Age**
From 65 to 74	235
From 75 to 84	276
85 and over	106
Less than 65	12

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2022

Hypertension	62
High Cholesterol	75
Stroke	4
Ischemic Heart Disease	21
Depression	16
Chronic Kidney Disease	19
Asthma	11
Osteoperosis	9
Atrial Fibrilation	20
Heart Failure	12
Chronic Obstructive Pulmonary Disease	8
Diabetes	14
Dementia	5
Cancer	13

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Brian Martin Sebastian, MD for Medicare patients.

The highest averages for the top procedures that Dr. Brian Martin Sebastian, MD treated as an internist in Sonoma, CA were preventive care, vaccines, lab tests and diabetes management.

cardiac procedures	11
diabetes management	257
doctor visit	1801
ear procedures	25
lab tests	325
nursing home care	114
preventive care	623
removal of lesion (e.g. growth)	22
skin procedures	22
vaccines	350

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Brian Martin Sebastian, MD.

**Gender**
Male	305
Female	323

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	582
Native American / Alaskan Native	0
Hispanic	10
Other	13

**Age**
75 to 84	213
85 and over	110
Less than 65	17
65 to 74	287

Average of Total of Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Brian Martin Sebastian, MD treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	51
High Cholesterol	46
Stroke	3
Ischemic Heart Disease	22
Depression	13
Chronic Kidney Disease	17
Asthma	6
Osteoporosis	3
Heart Failure	11
Chronic Obstructive Pulmonary Disease	5
Diabetes	12
Atrial Fibrillation	12
Dementia	7
Cancer	8

Education & Training

Dr. Brian Martin Sebastian, MD graduated from Duke University School of Medicine. He completed residency at Washington Hospital Center. He is certified by the American Board of Internal Medicine and has a state license in California.

Medical School: Duke University School of Medicine

Residency: Washington Hospital Center

Board Certification: American Board of Internal Medicine (2026)

Licensed In: California

Affiliations & Hospitals

Dr. Brian Martin Sebastian, MD is associated with these hospitals and organizations:

Marin General Hospital

Hill Physicians

Insurance Information

Please note: Insurance information may change at any time, and the provider may accept your insurance plan even if it is not listed below. Please contact the provider's office to confirm that your insurance is accepted.

Dr. Brian Martin Sebastian, MD appears to accept the following insurance providers: Health Net, Aetna, Cigna, UnitedHealthcare, Anthem, Canopy Health and Western Health Advantage (WHA).

Insurance Accepted by Provider includes:

According to our sources, Dr. Brian Martin Sebastian, MD accepts the following insurance providers:

Health Net

Aetna

Cigna

UnitedHealthcare

Anthem

Canopy Health

Western Health Advantage (WHA)

Ratings & Reviews

Dr. Brian Martin Sebastian, MD has a high overall rating with an average of 4.33 out of 5 stars based on 6 ratings. We collect ratings and reviews of Dr. Brian Martin Sebastian, MD from all over the web to help you find the right in Sonoma, CA.

4.33

Overall Rating

(6 Ratings)

Leave a Review

Reviews From Around The Web

Overall Rating: 5.0 2025-02-01

Patient verified via Press Ganey

I've been a patient of Dr. Sebastians for many years because I believe he's easy to communicate with for me.

Overall Rating: 5.0 2024-07-31

Patient verified via Press Ganey

The doctor listened intently to my concerns and we are moving ahead with possible treatments, etc.

Overall Rating: 5.0 2025-08-24

Patient verified via Press Ganey

Dr Sebastian is an excellent listener

Overall Rating: 5.0 2025-08-28

Patient verified via Press Ganey

This physician is outstanding.

General Payments

These charts describe general payments received by Dr. Brian Martin Sebastian, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
SANOFI PASTEUR INC.	$245 NO PRODUCT DISCUSSED $154	$91
Medtronic, Inc.	$128 Signia $128
Pfizer Inc.	$39 PREVNAR - 13 $20	COMIRNATY $18
Abbott Laboratories	$30 PROCLAIM $30
Medtronic Vascular, Inc.	$26 Micra $26
Other	$47 Edwards SAPIEN 3 Transcatheter Heart Valve $19	GARDASIL9 $14	$13

**Types of Payments**
Food and Beverage	$256
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$245
Education	$13

Biography

Dr. Brian Sebastian's average patient rating is 4.5 stars (out of 5). He usually honors Health Net, Anthem, and UnitedHealthcare, in addition to other insurance carriers. Before performing his residency at St. Christopher's Hospital for Children, Washington Hospital Center, and Georgetown University Hospital, Dr. Sebastian attended Duke University School of Medicine and Georgetown University School of Medicine. He has received the distinction of Best Physician - Sonoma Valley People's Choice Awards ;Physician of the Year - Sonoma Index Tribune. He is affiliated with Marin General Hospital and Hill Physicians. He has an open panel in Sonoma, CA according to Doctor.com.

Select Year:

Dr. Brian Martin Sebastian, MD

Office Locations

In The News

Noteworthy Medicare Patient Procedures Performed by Dr. Brian Martin Sebastian, MD in 2023

By Volume:

By Volume:

By Volume:

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

2013 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD in 2022

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Average Medicare Patient Data From 2012 - 2022

Average of Total of Conditions of Medicare patients treated by Dr. Brian Martin Sebastian, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Insurance Information

Ratings & Reviews

General Payments

Biography

Internists & Internal Medicine Doctors in Nearby Locations

Other Providers in Sonoma, CA