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Dr. Man-Siak Mak, MD

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(Dr. Man-Siak Mak, MD)

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Specializes in: Adult Gastroenterology

National Defense Medical Center

3349 G Street Suite B
Merced, CA 95340

(209) 349-8459

Dr. Man-Siak Mak, MD is a gastroenterologist in Merced, CA specializing in adult gastroenterology. He graduated from National Defense Medical Center. Dr. Man-Siak Mak, MD is affiliated with Mercy Medical Center Merced and Dignity Health.

Office Locations

Dignity Health

3349 G Street Suite B
Merced, CA 95340

(209) 349-8459

(209) 349-8140

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Noteworthy Medicare Patient Procedures Performed by Dr. Man-Siak Mak, MD in 2023

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

Top 5%

By Affordability:

EGD with biopsy

EGD with lesion removal

esophagogastroduodenoscopy

therapeutic EGD

therapeutic upper endoscopy

upper endoscopy

upper endoscopy with biopsy

upper endoscopy with lesion removal

In 2023, Dr. Man-Siak Mak, MD had a list price for EGD with biopsy, EGD with lesion removal, esophagogastroduodenoscopy (EGD), therapeutic EGD, therapeutic upper endoscopy, upper endoscopy, upper endoscopy with biopsy, and upper endoscopy with lesion removal that was lower than the list prices billed to Medicare by 95% of providers in related specialties within California. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 10%

By Affordability:

diagnostic EGD

diagnostic upper endoscopy

In 2023, Dr. Man-Siak Mak, MD had a list price for diagnostic EGD, and diagnostic upper endoscopy that was lower than the list prices billed to Medicare by 90% of providers in related specialties within California. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2012 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

balloon dilation	23
diagnostic procedures	349
doctor visit	1622
esophageal dilation	23
gastrointestinal procedures	471
hospital care	274
inpatient care	274
lab tests	49
minimally invasive procedures	471
preventive care	99
removal of lesion (e.g. growth)	349

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2013 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

balloon dilation	28
diagnostic procedures	322
doctor visit	1490
esophageal dilation	28
gastrointestinal procedures	441
hospital care	249
injections	13
inpatient care	249
lab tests	52
minimally invasive procedures	441
preventive care	78
removal of lesion (e.g. growth)	322

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	235
Female	350

**Ethnicity**
Non-Hispanic White	404
Black	29
Hispanic	118
Asian	22
Other	0
Native American	0

**Age**
From 65 to 74	242
From 75 to 84	236
85 and over	58
Less than 65	49

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2013

Hypertension	74
High Cholesterol	56
Stroke	5
Ischemic Heart Disease	46
Depression	15
Chronic Kidney Disease	27
Asthma	14
Osteoperosis	9
Atrial Fibrilation	9
Heart Failure	21
Chronic Obstructive Pulmonary Disease	15
Diabetes	36
Dementia	6
Cancer	13

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2014 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

balloon dilation	46
diagnostic procedures	305
doctor visit	1432
esophageal dilation	46
gastrointestinal procedures	424
hospital care	163
injections	15
inpatient care	163
lab tests	18
minimally invasive procedures	424
preventive care	58
removal of lesion (e.g. growth)	305

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	206
Female	316

**Ethnicity**
Non-Hispanic White	348
Black	31
Hispanic	111
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	217
From 75 to 84	199
85 and over	64
Less than 65	42

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2014

Hypertension	75
High Cholesterol	58
Stroke	4
Ischemic Heart Disease	47
Depression	16
Chronic Kidney Disease	28
Asthma	13
Osteoperosis	7
Atrial Fibrilation	10
Heart Failure	22
Chronic Obstructive Pulmonary Disease	17
Diabetes	38
Dementia	7
Cancer	12

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2015 were minimally invasive procedures, gastrointestinal procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

balloon dilation	33
diagnostic procedures	353
doctor visit	1298
esophageal dilation	33
gastrointestinal procedures	470
hospital care	112
injections	17
inpatient care	112
lab tests	20
minimally invasive procedures	470
preventive care	67
removal of lesion (e.g. growth)	329

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	344
Female	622

**Ethnicity**
Non-Hispanic White	668
Black	46
Hispanic	202
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	436
From 75 to 84	342
85 and over	112
Less than 65	76

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2015

Hypertension	72
High Cholesterol	56
Stroke	7
Ischemic Heart Disease	44
Depression	14
Chronic Kidney Disease	28
Asthma	19
Osteoperosis	7
Atrial Fibrilation	10
Heart Failure	22
Chronic Obstructive Pulmonary Disease	18
Diabetes	35
Dementia	7
Cancer	12

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2016 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

balloon dilation	23
diagnostic procedures	282
doctor visit	1110
esophageal dilation	23
gastrointestinal procedures	382
hospital care	47
injections	14
inpatient care	47
lab tests	14
minimally invasive procedures	382
preventive care	63
removal of lesion (e.g. growth)	282

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	161
Female	278

**Ethnicity**
Non-Hispanic White	315
Black	18
Hispanic	73
Asian	16
Other	0
Native American	0

**Age**
From 65 to 74	194
From 75 to 84	166
85 and over	39
Less than 65	40

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2016

Hypertension	70
High Cholesterol	58
Stroke	7
Ischemic Heart Disease	46
Depression	12
Chronic Kidney Disease	29
Asthma	23
Osteoperosis	8
Atrial Fibrilation	9
Heart Failure	22
Chronic Obstructive Pulmonary Disease	19
Diabetes	33
Dementia	7
Cancer	11

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2017 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

balloon dilation	21
diagnostic procedures	288
doctor visit	1078
esophageal dilation	21
gastrointestinal procedures	389
hospital care	146
injections	14
inpatient care	146
minimally invasive procedures	389
preventive care	66
removal of lesion (e.g. growth)	288

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	156
Female	248

**Ethnicity**
Non-Hispanic White	284
Black	19
Hispanic	69
Asian	19
Other	0
Native American	0

**Age**
From 65 to 74	191
From 75 to 84	139
85 and over	44
Less than 65	30

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2017

Hypertension	75
High Cholesterol	47
Stroke	6
Ischemic Heart Disease	43
Depression	15
Chronic Kidney Disease	30
Asthma	17
Osteoperosis	10
Atrial Fibrilation	10
Heart Failure	26
Chronic Obstructive Pulmonary Disease	18
Diabetes	36
Dementia	8
Cancer	13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2018 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

balloon dilation	24
diagnostic procedures	253
doctor visit	980
esophageal dilation	24
gastrointestinal procedures	354
hospital care	132
injections	23
inpatient care	132
minimally invasive procedures	354
preventive care	54
removal of lesion (e.g. growth)	253

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	143
Female	226

**Ethnicity**
Non-Hispanic White	243
Black	18
Hispanic	81
Asian	16
Other	0
Native American	0

**Age**
From 65 to 74	165
From 75 to 84	132
85 and over	39
Less than 65	33

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2018

Hypertension	75
High Cholesterol	58
Stroke	5
Ischemic Heart Disease	0
Depression	14
Chronic Kidney Disease	36
Asthma	16
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	28
Chronic Obstructive Pulmonary Disease	19
Diabetes	37
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2019 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

diagnostic procedures	157
doctor visit	405
gastrointestinal procedures	186
hospital care	72
inpatient care	72
minimally invasive procedures	186
preventive care	29
removal of lesion (e.g. growth)	157

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	94
Female	150

**Ethnicity**
Non-Hispanic White	168
Black	0
Hispanic	47
Asian	13
Other	0
Native American	0

**Age**
From 65 to 74	115
From 75 to 84	76
85 and over	32
Less than 65	21

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2019

Hypertension	72
High Cholesterol	58
Stroke	7
Ischemic Heart Disease	48
Depression	15
Chronic Kidney Disease	31
Asthma	14
Osteoperosis	8
Atrial Fibrilation	16
Heart Failure	32
Chronic Obstructive Pulmonary Disease	20
Diabetes	34
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2020 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

balloon dilation	15
diagnostic procedures	102
doctor visit	539
esophageal dilation	15
gastrointestinal procedures	141
minimally invasive procedures	141
preventive care	24
removal of lesion (e.g. growth)	102

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	101
Female	130

**Ethnicity**
Non-Hispanic White	167
Black	0
Hispanic	39
Asian	14
Other	0
Native American	0

**Age**
From 65 to 74	109
From 75 to 84	80
85 and over	21
Less than 65	21

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2020

Hypertension	69
High Cholesterol	52
Stroke	0
Ischemic Heart Disease	40
Depression	14
Chronic Kidney Disease	31
Asthma	12
Osteoperosis	6
Atrial Fibrilation	14
Heart Failure	27
Chronic Obstructive Pulmonary Disease	20
Diabetes	32
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2021 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

diagnostic procedures	127
doctor visit	476
gastrointestinal procedures	138
minimally invasive procedures	138
preventive care	11
removal of lesion (e.g. growth)	127

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	85
Female	124

**Ethnicity**
Non-Hispanic White	141
Black	11
Hispanic	41
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	96
From 75 to 84	70
85 and over	21
Less than 65	22

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2021

Hypertension	75
High Cholesterol	54
Stroke	5
Ischemic Heart Disease	35
Depression	16
Chronic Kidney Disease	26
Asthma	14
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	25
Chronic Obstructive Pulmonary Disease	17
Diabetes	31
Dementia	0
Cancer	10

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA during 2022 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

diagnostic procedures	128
doctor visit	505
gastrointestinal procedures	140
minimally invasive procedures	140
preventive care	12
removal of lesion (e.g. growth)	128

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Male	103
Female	125

**Ethnicity**
Non-Hispanic White	162
Black	0
Hispanic	38
Asian	11
Other	0
Native American	0

**Age**
From 65 to 74	112
From 75 to 84	79
85 and over	23
Less than 65	14

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2022

Hypertension	75
High Cholesterol	67
Stroke	5
Ischemic Heart Disease	30
Depression	15
Chronic Kidney Disease	18
Asthma	17
Osteoperosis	11
Atrial Fibrilation	19
Heart Failure	20
Chronic Obstructive Pulmonary Disease	18
Diabetes	32
Dementia	0
Cancer	14

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Man-Siak Mak, MD for Medicare patients.

The highest averages for the top procedures that Dr. Man-Siak Mak, MD treated as a gastroenterologist in Merced, CA were minimally invasive procedures, gastrointestinal procedures, diagnostic procedures and removal of lesion (e.g. growth).

balloon dilation	26
diagnostic procedures	242
doctor visit	994
esophageal dilation	26
gastrointestinal procedures	321
hospital care	149
injections	16
inpatient care	149
lab tests	30
minimally invasive procedures	321
preventive care	51
removal of lesion (e.g. growth)	240

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Man-Siak Mak, MD.

**Gender**
Female	233
Male	148

**Ethnicity**
Black / African American	15
Asian / Pacific Islander	10
Non-Hispanic White	263
Native American / Alaskan Native	0
Hispanic	74
Other	0

**Age**
85 and over	41
75 to 84	138
Less than 65	31
65 to 74	170

Average of Total of Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Man-Siak Mak, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	66
High Cholesterol	51
Stroke	4
Ischemic Heart Disease	34
Depression	13
Chronic Kidney Disease	25
Asthma	14
Osteoporosis	7
Heart Failure	22
Chronic Obstructive Pulmonary Disease	16
Diabetes	31
Atrial Fibrillation	11
Dementia	5
Cancer	10

Education & Training

Dr. Man-Siak Mak, MD graduated from National Defense Medical Center. He completed residency at Bronx-Lebanon Hospital Center. He is certified by the Internal Medicine Internal Medicine (Sub: Gastroenterology) and has a state license in California.

Medical School: National Defense Medical Center

Residency: Bronx-Lebanon Hospital Center

Board Certification: Internal Medicine Internal Medicine (Sub: Gastroenterology)

Licensed In: California

Affiliations & Hospitals

Dr. Man-Siak Mak, MD is associated with these hospitals and organizations:

Mercy Medical Center Merced

Dignity Health

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. Man-Siak Mak, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Braintree Laboratories, Inc.	$226 SUTAB $153	SUPREP BOWEL PREP $73
Smith & Nephew, Inc.	$15 Santyl $15

**Types of Payments**
Gift	$226
Food and Beverage	$15

Biography

Dr. Man-Siak Mak is a specialist in adult gastroenterology in Merced, CA. He is a graduate of National Defense Medical Center and a graduate of Bronx-Lebanon Hospital Center's residency program. In addition to English, he speaks Mandarin and Cantonese. Dr. Mak is professionally affiliated with Mercy Medical Center Merced. According to Dignity Health, Dr. Mak is currently accepting new patients at his office in Merced, CA.

Select Year:

Dr. Man-Siak Mak, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Man-Siak Mak, MD in 2023

By Affordability:

By Affordability:

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. Man-Siak Mak, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Man-Siak Mak, 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. Man-Siak Mak, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

Other Providers in Merced, CA