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Home > CA Providers > Surgical Oncologists

Dr. Gregory Michael Senofsky, MD

Accepting New Patients

(10 Ratings)

Specializes in: General Surgery and Surgical Oncology (Cancer Surgery)

Baylor College of Medicine (1983)

Professional interests include: breast cancer surgery, breast cancer, colorectal surgery procedures, and more.

27235 Tourney Road Suite 2400
Santa Clarita, CA 91355

(661) 255-9287

Dr. Gregory Michael Senofsky, MD is a general surgeon in Santa Clarita, CA specializing in general surgery and surgical oncology (cancer surgery). He graduated from Baylor College of Medicine in 1983 and has 43 years of experience. Dr. Gregory Michael Senofsky, MD is affiliated with UCLA Health and UCLA West Valley Medical Center.

Office Locations

27235 Tourney Road Suite 2400
Santa Clarita, CA 91355

(661) 255-9287

(661) 255-8478

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27235 Tourney Road Suite 2400
Valencia, CA 91355

open_in_new

15503 Ventura Boulevard Suite 150
Encino, CA 91436

(818) 995-8044

(818) 995-8007

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19950 Rinaldi Street Suite 310
Porter Ranch, CA 91326

(818) 271-2500

(818) 271-2501

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In The News

“Dr. Gregory Senofsky, a surgical oncologist at The Breast Center in Van Nuys, and a member of the board of directors of the San Fernando Valley American Cancer Society, said the men he has treated...”—"Men Are Not Immune : The average male with breast cancer is between the ages of 50 and 65--10 years older than the average woman--and typically, the disease is well advanced.", Los Angeles Times, August 2024

“"My colleagues and I continue to push the boundaries of excellence in breast cancer care," said Dr. Greg Senofsky, a breast and melanoma surgical oncologist at UCLA Health.”—"Relay for Life returns to Santa Clarita for its 21st year", Santa Clarita Valley Signal, May 2019

“Whether or not a woman decides to under go a double, or contralateral, mastectomy depends on a number of factors, said Dr. Gregory Senofsky, breast cancer surgeon and assistant director of the...”—"Giuliana Rancic's planned double mastectomy: What it means", Los Angeles Times, December 2011

Noteworthy Medicare Patient Procedures Performed by Dr. Gregory Michael Senofsky, MD in 2023

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

Top 10%

By Volume:

lymph node procedures

In 2023, Dr. Gregory Michael Senofsky, MD performed more lymph node procedures procedures for Medicare patients than 90% of providers in related specialties within California.

Top 25%

By Volume:

breast cancer surgery

breast surgery

excision

mastectomy for breast cancer

open lymph node biopsy

In 2012, Dr. Gregory Michael Senofsky, MD performed more breast cancer surgery, breast surgery, excision, mastectomy for breast cancer, and open lymph node biopsy 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. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2012 were breast procedures, cancer surgery, excision and lymph node procedures.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	70
cancer surgery	70
dissection	24
doctor visit	329
excision	70
lymph node procedures	61
plastic surgery procedures	11
reconstructive surgery	11
tissue transfer	11
wound repair (e.g. stitches)	11

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2013 were lymph node procedures, breast procedures, cancer surgery and excision.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	50
cancer surgery	50
dissection	19
doctor visit	371
excision	50
lymph node procedures	51

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	21
Female	188

**Ethnicity**
Non-Hispanic White	171
Black	0
Hispanic	17
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	109
From 75 to 84	63
85 and over	16
Less than 65	21

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2013

Hypertension	58
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	29
Depression	20
Chronic Kidney Disease	13
Asthma	9
Osteoperosis	15
Atrial Fibrilation	0
Heart Failure	9
Chronic Obstructive Pulmonary Disease	11
Diabetes	24
Dementia	7
Cancer	66

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2014 were lymph node procedures, dissection, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	20
cancer surgery	20
dissection	20
doctor visit	426
excision	20
lymph node procedures	46

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	27
Female	222

**Ethnicity**
Non-Hispanic White	207
Black	0
Hispanic	16
Asian	0
Other	13
Native American	0

**Age**
From 65 to 74	144
From 75 to 84	70
85 and over	15
Less than 65	20

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2014

Hypertension	60
High Cholesterol	59
Stroke	5
Ischemic Heart Disease	25
Depression	16
Chronic Kidney Disease	13
Asthma	9
Osteoperosis	13
Atrial Fibrilation	6
Heart Failure	10
Chronic Obstructive Pulmonary Disease	12
Diabetes	25
Dementia	6
Cancer	61

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2015 were lymph node procedures, breast procedures, cancer surgery and excision.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	63
cancer surgery	63
dissection	28
doctor visit	473
excision	63
lymph node procedures	71

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	50
Female	506

**Ethnicity**
Non-Hispanic White	452
Black	26
Hispanic	38
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	308
From 75 to 84	150
85 and over	34
Less than 65	64

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2015

Hypertension	63
High Cholesterol	57
Stroke	6
Ischemic Heart Disease	29
Depression	19
Chronic Kidney Disease	14
Asthma	9
Osteoperosis	15
Atrial Fibrilation	8
Heart Failure	9
Chronic Obstructive Pulmonary Disease	9
Diabetes	27
Dementia	6
Cancer	68

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2016 were breast procedures, excision, lymph node procedures and cancer surgery.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	69
cancer surgery	56
diagnostic procedures	13
dissection	26
doctor visit	512
excision	69
lymph node procedures	63
open surgery	13
plastic surgery procedures	19
reconstructive surgery	19
tissue transfer	19
wound repair (e.g. stitches)	19

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	29
Female	249

**Ethnicity**
Non-Hispanic White	228
Black	0
Hispanic	20
Asian	0
Other	13
Native American	0

**Age**
From 65 to 74	160
From 75 to 84	73
85 and over	13
Less than 65	32

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2016

Hypertension	63
High Cholesterol	59
Stroke	4
Ischemic Heart Disease	30
Depression	15
Chronic Kidney Disease	19
Asthma	16
Osteoperosis	16
Atrial Fibrilation	8
Heart Failure	11
Chronic Obstructive Pulmonary Disease	11
Diabetes	31
Dementia	5
Cancer	65

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2017 were breast procedures, excision, cancer surgery and lymph node procedures.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	84
cancer surgery	68
diagnostic procedures	16
dissection	20
doctor visit	570
excision	84
lymph node procedures	59
open surgery	16
plastic surgery procedures	19
reconstructive surgery	19
tissue transfer	19
wound repair (e.g. stitches)	19

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	34
Female	302

**Ethnicity**
Non-Hispanic White	276
Black	0
Hispanic	22
Asian	15
Other	0
Native American	0

**Age**
From 65 to 74	184
From 75 to 84	101
85 and over	28
Less than 65	23

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2017

Hypertension	63
High Cholesterol	55
Stroke	5
Ischemic Heart Disease	30
Depression	19
Chronic Kidney Disease	25
Asthma	9
Osteoperosis	18
Atrial Fibrilation	8
Heart Failure	15
Chronic Obstructive Pulmonary Disease	13
Diabetes	31
Dementia	4
Cancer	59

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2018 were excision, lymph node procedures, breast procedures and open surgery.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	76
cancer surgery	59
diagnostic procedures	64
doctor visit	546
excision	123
lymph node procedures	99
open surgery	64
plastic surgery procedures	18
reconstructive surgery	18
tissue transfer	18
wound repair (e.g. stitches)	18

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	24
Female	312

**Ethnicity**
Non-Hispanic White	272
Black	11
Hispanic	27
Asian	14
Other	12
Native American	0

**Age**
From 65 to 74	184
From 75 to 84	94
85 and over	29
Less than 65	29

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2018

Hypertension	63
High Cholesterol	58
Stroke	4
Ischemic Heart Disease	27
Depression	21
Chronic Kidney Disease	21
Asthma	10
Osteoperosis	19
Atrial Fibrilation	5
Heart Failure	8
Chronic Obstructive Pulmonary Disease	10
Diabetes	27
Dementia	7
Cancer	63

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2019 were excision, lymph node procedures, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	63
cancer surgery	51
diagnostic procedures	50
doctor visit	529
excision	101
lymph node procedures	85
open surgery	50
plastic surgery procedures	18
reconstructive surgery	18
tissue transfer	18
wound repair (e.g. stitches)	18

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	35
Female	312

**Ethnicity**
Non-Hispanic White	272
Black	0
Hispanic	26
Asian	25
Other	0
Native American	0

**Age**
From 65 to 74	197
From 75 to 84	104
85 and over	21
Less than 65	25

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2019

Hypertension	65
High Cholesterol	62
Stroke	6
Ischemic Heart Disease	30
Depression	21
Chronic Kidney Disease	19
Asthma	10
Osteoperosis	21
Atrial Fibrilation	9
Heart Failure	10
Chronic Obstructive Pulmonary Disease	14
Diabetes	28
Dementia	9
Cancer	61

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2020 were excision, lymph node procedures, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	40
cancer surgery	40
diagnostic procedures	26
doctor visit	497
excision	66
lymph node procedures	54
open surgery	26
plastic surgery procedures	20
reconstructive surgery	20
tissue transfer	20
wound repair (e.g. stitches)	20

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	35
Female	296

**Ethnicity**
Non-Hispanic White	263
Black	13
Hispanic	23
Asian	20
Other	12
Native American	0

**Age**
From 65 to 74	202
From 75 to 84	91
85 and over	18
Less than 65	20

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2020

Hypertension	58
High Cholesterol	58
Stroke	3
Ischemic Heart Disease	30
Depression	20
Chronic Kidney Disease	18
Asthma	9
Osteoperosis	20
Atrial Fibrilation	8
Heart Failure	13
Chronic Obstructive Pulmonary Disease	8
Diabetes	28
Dementia	8
Cancer	64

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2021 were excision, lymph node procedures, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	39
cancer surgery	39
diagnostic procedures	23
doctor visit	461
excision	62
lymph node procedures	57
open surgery	23
plastic surgery procedures	19
reconstructive surgery	19
tissue transfer	19
wound repair (e.g. stitches)	19

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	27
Female	286

**Ethnicity**
Non-Hispanic White	237
Black	17
Hispanic	22
Asian	23
Other	0
Native American	0

**Age**
From 65 to 74	171
From 75 to 84	106
85 and over	14
Less than 65	22

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2021

Hypertension	60
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	25
Depression	18
Chronic Kidney Disease	16
Asthma	9
Osteoperosis	22
Atrial Fibrilation	6
Heart Failure	9
Chronic Obstructive Pulmonary Disease	9
Diabetes	25
Dementia	8
Cancer	67

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA during 2022 were lymph node procedures, excision, breast procedures and cancer surgery.

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

breast procedures	37
cancer surgery	37
diagnostic procedures	30
doctor visit	501
excision	67
lymph node procedures	67
open surgery	30
plastic surgery procedures	18
reconstructive surgery	18
tissue transfer	18
wound repair (e.g. stitches)	18

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	21
Female	323

**Ethnicity**
Non-Hispanic White	268
Black	0
Hispanic	26
Asian	22
Other	14
Native American	0

**Age**
From 65 to 74	208
From 75 to 84	99
85 and over	18
Less than 65	19

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2022

Hypertension	69
High Cholesterol	74
Stroke	6
Ischemic Heart Disease	19
Depression	23
Chronic Kidney Disease	12
Asthma	12
Osteoperosis	27
Atrial Fibrilation	8
Heart Failure	9
Chronic Obstructive Pulmonary Disease	10
Diabetes	25
Dementia	0
Cancer	70

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Gregory Michael Senofsky, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregory Michael Senofsky, MD treated as a general surgeon in Santa Clarita, CA were excision, lymph node procedures, breast procedures and cancer surgery.

breast procedures	55
cancer surgery	50
diagnostic procedures	31
dissection	22
doctor visit	474
excision	70
lymph node procedures	64
open surgery	31
plastic surgery procedures	17
reconstructive surgery	17
tissue transfer	17
wound repair (e.g. stitches)	17

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Gregory Michael Senofsky, MD.

**Gender**
Male	27
Female	272

**Ethnicity**
Black / African American	6
Asian / Pacific Islander	10
Non-Hispanic White	240
Native American / Alaskan Native	0
Hispanic	21
Other	5

**Age**
75 to 84	86
85 and over	18
Less than 65	25
65 to 74	169

Average of Total of Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Gregory Michael Senofsky, MD treated were cancer, hypertension, high cholesterol and diabetes.

Hypertension	56
High Cholesterol	54
Stroke	3
Ischemic Heart Disease	24
Depression	17
Chronic Kidney Disease	15
Asthma	9
Osteoporosis	16
Heart Failure	9
Chronic Obstructive Pulmonary Disease	9
Diabetes	24
Atrial Fibrillation	6
Dementia	5
Cancer	58

Education & Training

Dr. Gregory Michael Senofsky, MD graduated from Baylor College of Medicine in 1983. He completed residency at University of California, San Diego (UCSD) Affiliated Hospitals. He has a state license in California.

Medical School: Baylor College of Medicine (1983)

Residency: University of California, San Diego (UCSD) Affiliated Hospitals (1990)

Licensed In: California

Affiliations & Hospitals

Dr. Gregory Michael Senofsky, MD is associated with these hospitals and organizations:

UCLA Health

UCLA West Valley Medical Center

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. Gregory Michael Senofsky, MD appears to accept the following insurance providers: Private Healthcare Systems (PHCS), TRICARE, Cigna, Aetna, Blue Shield of California, MultiPlan, UnitedHealthcare, Anthem, Medicare Advantage, Prime Health, First Health, HealthSmart, Centivo, Health Net of California and UFCM Health System.

Insurance Accepted by Provider includes:

According to our sources, Dr. Gregory Michael Senofsky, MD accepts the following insurance providers:

Private Healthcare Systems (PHCS)

TRICARE

Cigna

Aetna

Blue Shield of California

MultiPlan

UnitedHealthcare

Anthem

Medicare Advantage

Prime Health

First Health

HealthSmart

Centivo

Health Net of California

UFCM Health System

Ratings & Reviews

Dr. Gregory Michael Senofsky, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 10 ratings. We collect ratings and reviews of Dr. Gregory Michael Senofsky, MD from all over the web to help you find the right in Santa Clarita, CA.

Overall Rating

(10 Ratings)

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General Payments

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

**Payments by Company**
E.R. Squibb & Sons, L.L.C.	$194 OPDIVO $153	YERVOY $41
Allergan Inc.	$134 AlloDerm $134
Genentech USA, Inc.	$17 Perjeta $17
Janssen Pharmaceuticals, Inc	$16 INVEGA TRINZA $16
Baxter Healthcare	$12 BioSurgery - TISSEEL $12
Other	$11 ENTRE $11

**Types of Payments**
Food and Beverage	$385

Biography

Dr. Gregory Senofsky practices general surgery and surgical oncology (cancer surgery). Dr. Senofsky graduated from Baylor College of Medicine and then he performed his residency at a hospital affiliated with the University of California, San Diego (UCSD). Areas of expertise for Dr. Senofsky include colorectal surgery procedures, breast cancer surgery, and breast cancer. He is rated 5.0 stars (out of 5) by his patients. He appears to be in-network for Anthem, UnitedHealthcare, and Blue California, in addition to other insurance carriers. He has received professional recognition including the following: Super Doctors Southern California; Southern California Super Doctors; and Super doctors, Southern California. Dr. Senofsky is conversant in Spanish. He is professionally affiliated with UCLA Health. UCLA Health reports that Dr. Senofsky is accepting new patients at his office in Valencia, CA.

Select Year:

Dr. Gregory Michael Senofsky, MD

Office Locations

In The News

Noteworthy Medicare Patient Procedures Performed by Dr. Gregory Michael Senofsky, MD in 2023

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. Gregory Michael Senofsky, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Gregory Michael Senofsky, 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. Gregory Michael Senofsky, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Insurance Information

Ratings & Reviews

General Payments

Biography

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