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Dr. Peter J. Mazolewski, MD, FACS

Accepting New Patients
(Dr. Peter James Mazolewski, M.D.)
Specializes in: General Surgery
University of Southern California (USC), Keck School of Medicine
2637 Shadelands Drive
Walnut Creek, CA 94598

Dr. Peter J. Mazolewski, MD, FACS is a general surgeon in Walnut Creek, CA specializing in general surgery. He graduated from University of Southern California (USC), Keck School of Medicine. Dr. Peter J. Mazolewski, MD, FACS is affiliated with Brown and Toland Physicians, John Muir Health, Hill Physicians, BASS MEDICAL GROUP, John Muir Medical Center - Walnut Creek and John Muir Medical Center- Concord.

View Doctor's Full Profile (925) 391-8086

Office Locations

Hill Physicians

2637 Shadelands Drive
Walnut Creek, CA 94598
(925) 391-8086
open_in_new
365 Lennon Lane Suite 290
Walnut Creek, CA 94598
open_in_new

In The News (see more mentions in the news)

“Pete Mazolewski, a trauma surgeon at John Muir Health, said he helped popularize a once unorthodox approach to inflamed appendix treatment and argued many early COVID treatments will follow...”—"Judge puts new California law policing doctors' COVID speech on hold", Red Bluff Daily News, January 2023
“Dr. Pete Mazolewski is a trauma surgeon at John Muir Health who said his approach to delaying immediate removal of an inflamed appendix in favor of antibiotic therapy has since become standard.”—"Doctors sue to block California COVID disinformation law", Mercury News, November 2022
“California bill to punish doctors for COVID misinformation 'dangerous to patient care': Dr. Peter Mazolewski.”—"Fox News 2022 September 27 Video Sitemap", Fox News, September 2022

Noteworthy Medicare Patient Procedures Performed by Dr. Peter J. Mazolewski, MD, FACS in 2023

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

Top 25%

By Volume:

inpatient hospital care

In 2012, Dr. Peter J. Mazolewski, MD, FACS performed more inpatient hospital care (for patient admitted to hospital) 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. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2012 were injections, hospital care, inpatient care and pain management.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

aspiration 33
doctor visit 169
hospital care 80
implant surgery 27
injections 104
inpatient care 80
neurostimulator replacement 27
pain management 71
spinal procedures 34
X-rays 34

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2013 were hospital care and inpatient care.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

doctor visit 42
hospital care 219
inpatient care 219

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 66
Female 98
Ethnicity
Non-Hispanic White 140
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 57
From 75 to 84 51
85 and over 41
Less than 65 15

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2013

Hypertension 75
High Cholesterol 55
Stroke 8
Ischemic Heart Disease 43
Depression 23
Chronic Kidney Disease 45
Asthma 10
Osteoperosis 16
Atrial Fibrilation 19
Heart Failure 35
Chronic Obstructive Pulmonary Disease 20
Diabetes 30
Dementia 16
Cancer 24

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2014 were hospital care, inpatient care and catheterization.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

catheterization 13
doctor visit 75
hospital care 209
inpatient care 209

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 111
Female 101
Ethnicity
Non-Hispanic White 172
Black 12
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 76
From 75 to 84 69
85 and over 47
Less than 65 20

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2014

Hypertension 72
High Cholesterol 60
Stroke 8
Ischemic Heart Disease 34
Depression 27
Chronic Kidney Disease 45
Asthma 10
Osteoperosis 11
Atrial Fibrilation 22
Heart Failure 28
Chronic Obstructive Pulmonary Disease 15
Diabetes 27
Dementia 17
Cancer 19

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2015 were hospital care and inpatient care.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

doctor visit 30
hospital care 305
inpatient care 305

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 206
Female 222
Ethnicity
Non-Hispanic White 340
Black 0
Hispanic 0
Asian 32
Other 0
Native American 0
Age
From 65 to 74 172
From 75 to 84 96
85 and over 116
Less than 65 44

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2015

Hypertension 71
High Cholesterol 61
Stroke 7
Ischemic Heart Disease 39
Depression 27
Chronic Kidney Disease 50
Asthma 19
Osteoperosis 16
Atrial Fibrilation 20
Heart Failure 31
Chronic Obstructive Pulmonary Disease 20
Diabetes 29
Dementia 25
Cancer 24

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2016 were hospital care and inpatient care.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

doctor visit 73
hospital care 338
inpatient care 338

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 111
Female 117
Ethnicity
Non-Hispanic White 180
Black 11
Hispanic 19
Asian 0
Other 0
Native American 0
Age
From 65 to 74 87
From 75 to 84 68
85 and over 50
Less than 65 23

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2016

Hypertension 71
High Cholesterol 61
Stroke 10
Ischemic Heart Disease 41
Depression 32
Chronic Kidney Disease 50
Asthma 22
Osteoperosis 13
Atrial Fibrilation 23
Heart Failure 29
Chronic Obstructive Pulmonary Disease 19
Diabetes 30
Dementia 16
Cancer 23

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2017 were hospital care, inpatient care, open surgery and abdominal surgery.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

abdominal surgery 12
doctor visit 97
gastrointestinal procedures 12
hospital care 239
inpatient care 239
open surgery 12

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 117
Female 122
Ethnicity
Non-Hispanic White 180
Black 0
Hispanic 21
Asian 20
Other 0
Native American 0
Age
From 65 to 74 82
From 75 to 84 84
85 and over 50
Less than 65 23

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2017

Hypertension 75
High Cholesterol 60
Stroke 7
Ischemic Heart Disease 36
Depression 30
Chronic Kidney Disease 59
Asthma 15
Osteoperosis 12
Atrial Fibrilation 20
Heart Failure 29
Chronic Obstructive Pulmonary Disease 19
Diabetes 32
Dementia 17
Cancer 19

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2018 were hospital care and inpatient care.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

doctor visit 43
hospital care 318
inpatient care 318

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 125
Female 113
Ethnicity
Non-Hispanic White 178
Black 0
Hispanic 23
Asian 16
Other 0
Native American 0
Age
From 65 to 74 88
From 75 to 84 74
85 and over 44
Less than 65 32

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2018

Hypertension 75
High Cholesterol 63
Stroke 8
Ischemic Heart Disease 42
Depression 28
Chronic Kidney Disease 56
Asthma 18
Osteoperosis 12
Atrial Fibrilation 26
Heart Failure 34
Chronic Obstructive Pulmonary Disease 23
Diabetes 34
Dementia 21
Cancer 22

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2019 were hospital care and inpatient care.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

doctor visit 37
hospital care 286
inpatient care 286

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 95
Female 103
Ethnicity
Non-Hispanic White 128
Black 0
Hispanic 29
Asian 22
Other 0
Native American 0
Age
From 65 to 74 85
From 75 to 84 57
85 and over 35
Less than 65 21

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2019

Hypertension 75
High Cholesterol 71
Stroke 6
Ischemic Heart Disease 37
Depression 32
Chronic Kidney Disease 63
Asthma 17
Osteoperosis 13
Atrial Fibrilation 22
Heart Failure 30
Chronic Obstructive Pulmonary Disease 18
Diabetes 36
Dementia 14
Cancer 18

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2020 were hospital care and inpatient care.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

doctor visit 38
hospital care 228
inpatient care 228

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 100
Female 116
Ethnicity
Non-Hispanic White 138
Black 18
Hispanic 32
Asian 0
Other 0
Native American 0
Age
From 65 to 74 84
From 75 to 84 66
85 and over 35
Less than 65 31

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2020

Hypertension 75
High Cholesterol 63
Stroke 7
Ischemic Heart Disease 40
Depression 30
Chronic Kidney Disease 62
Asthma 15
Osteoperosis 12
Atrial Fibrilation 19
Heart Failure 31
Chronic Obstructive Pulmonary Disease 27
Diabetes 34
Dementia 17
Cancer 14

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2021 were hospital care and inpatient care.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

doctor visit 45
hospital care 271
inpatient care 271

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 101
Female 130
Ethnicity
Non-Hispanic White 145
Black 23
Hispanic 38
Asian 0
Other 0
Native American 0
Age
From 65 to 74 96
From 75 to 84 76
85 and over 34
Less than 65 25

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2021

Hypertension 75
High Cholesterol 74
Stroke 10
Ischemic Heart Disease 40
Depression 31
Chronic Kidney Disease 65
Asthma 22
Osteoperosis 15
Atrial Fibrilation 23
Heart Failure 32
Chronic Obstructive Pulmonary Disease 23
Diabetes 42
Dementia 20
Cancer 18

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

doctor visit 40
hospital care 233
inpatient care 233

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 89
Female 99
Ethnicity
Non-Hispanic White 119
Black 0
Hispanic 20
Asian 21
Other 0
Native American 0
Age
From 65 to 74 67
From 75 to 84 65
85 and over 30
Less than 65 26

Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS in 2022

Hypertension 75
High Cholesterol 75
Stroke 9
Ischemic Heart Disease 32
Depression 24
Chronic Kidney Disease 44
Asthma 21
Osteoperosis 20
Atrial Fibrilation 36
Heart Failure 38
Chronic Obstructive Pulmonary Disease 24
Diabetes 38
Dementia 20
Cancer 18

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Peter J. Mazolewski, MD, FACS for Medicare patients.

The highest averages for the top procedures that Dr. Peter J. Mazolewski, MD, FACS treated as a general surgeon in Walnut Creek, CA were inpatient care, hospital care, injections and pain management.

abdominal surgery 12
aspiration 33
catheterization 13
doctor visit 62
gastrointestinal procedures 12
hospital care 247
implant surgery 27
injections 104
inpatient care 247
neurostimulator replacement 27
open surgery 12
pain management 71
spinal procedures 34
X-rays 34

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS.

Gender
Male 101
Female 111
Ethnicity
Black / African American 5
Asian / Pacific Islander 10
Non-Hispanic White 156
Hispanic 16
Native American / Alaskan Native 0
Other 0
Age
75 to 84 64
85 and over 43
Less than 65 23
65 to 74 81

Average of Total of Conditions of Medicare patients treated by Dr. Peter J. Mazolewski, MD, FACS From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Peter J. Mazolewski, MD, FACS treated were hypertension, high cholesterol, chronic kidney disease and ischemic heart disease.

Hypertension 67
High Cholesterol 58
Stroke 7
Ischemic Heart Disease 34
Depression 25
Chronic Kidney Disease 49
Asthma 15
Osteoporosis 12
Heart Failure 28
Chronic Obstructive Pulmonary Disease 18
Diabetes 30
Atrial Fibrillation 20
Cancer 18
Dementia 16

Education & Training

Dr. Peter J. Mazolewski, MD, FACS graduated from University of Southern California (USC), Keck School of Medicine. He completed residency at University of Nevada Affiliated Hospitals. He is certified by the Certification: American Board of Surgery and has a state license in California.

Medical School: University of Southern California (USC), Keck School of Medicine

Residency: University of Nevada Affiliated Hospitals

Board Certification: Certification: American Board of Surgery

Licensed In: California

Affiliations & Hospitals

Dr. Peter J. Mazolewski, MD, FACS is associated with these hospitals and organizations:

Brown and Toland Physicians
John Muir Health
Hill Physicians
BASS MEDICAL GROUP
John Muir Medical Center - Walnut Creek
John Muir Medical Center- Concord

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. Peter J. Mazolewski, MD, FACS appears to accept the following insurance providers: Cigna, Aetna, Blue Shield of California, Anthem, UnitedHealthcare, Health Net, Humana, Hill Physicians Care Solutions, Central Health Plan, CCHP Health Plan (Chinese Community Health Plan) and Canopy Health.

Insurance Accepted by Provider includes:

According to our sources, Dr. Peter J. Mazolewski, MD, FACS accepts the following insurance providers:

Cigna
Aetna
Blue Shield of California
Anthem
UnitedHealthcare
Health Net
Humana
Hill Physicians Care Solutions
Central Health Plan
CCHP Health Plan (Chinese Community Health Plan)
Canopy Health

Ratings & Reviews

Dr. Peter J. Mazolewski, MD, FACS has a good overall rating with an average of 3.4 out of 5 stars based on 5 ratings. We collect ratings and reviews of Dr. Peter J. Mazolewski, MD, FACS from all over the web to help you find the right in Walnut Creek, CA. 

3.4
Overall Rating
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General Payments

These charts describe general payments received by Dr. Peter J. Mazolewski, MD, FACS. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

Payments by Company
Davol Inc. $407 Phasix Mesh
$201 		PHASIX
$123 		SURGICAL
$83
Smith & Nephew, Inc. $210 Santyl
$164 		Regranex
$46
Covidien Sales LLC $153 ProGrip
$77 		Vessel Sealing
$75
Intuitive Surgical, Inc. $135 Da Vinci Surgical System
$135
Medtronic USA, Inc. $122 Advanced Energy Hemostatic Device
$122
Other $314 TISSEEL
$60 		AirSeal
$42 		Advanced Energy Hemostatic Device
$35 		LigaSure
$31 		PINPOINT
$31 		Other
$116
Types of Payments
Food and Beverage $1,341

Biography

Dr. Peter Mazolewski's area of specialization is general surgery. He is rated 3.5 stars (out of 5) by his patients. Dr. Mazolewski appears to be in-network for Blue Shield, Health Net, and Anthem, in addition to other insurance carriers. He attended the University of Southern California (USC), Keck School of Medicine and then went on to complete his residency at a hospital affiliated with the University of Nevada. He speaks Spanish. Dr. Mazolewski is professionally affiliated with Brown and Toland Physicians, Hill Physicians, and John Muir Medical Center, Concord. John Muir Health reports that he is accepting new patients at his office in Walnut Creek, CA.

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