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Dr. Shereen J. Chang, MD

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(Dr. Shereen Juhsun Chang, MD)

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Specializes in: Neurology (Brain & Spinal Cord Disease)

University of Iowa, Carver College of Medicine

Professional interests include: hemifacial spasm, general neurology, onabotulinumtoxinA (Botox, Botox Cosmetic), and more.

275 10th Street Southeast Pci Medical Pavilion 2, Suite 3320
Cedar Rapids, IA 52403

(319) 398-1721

Dr. Shereen J. Chang, MD is a neurologist in Cedar Rapids, IA specializing in neurology (brain & spinal cord disease). She graduated from University of Iowa, Carver College of Medicine. Dr. Shereen J. Chang, MD is affiliated with Mercy Hospital, UnityPoint Health, Physicians' Clinic of Iowa, P.C., St. Luke's Hospital and PHYSICIANS' CLINIC OF IOWA, PC.

Office Locations

St. Luke's Hospital

275 10th Street Southeast Pci Medical Pavilion 2, Suite 3320
Cedar Rapids, IA 52403

(319) 398-1721

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Some issues Dr. Shereen J. Chang, MD can help you with:

Hyperhidrosis (Excessive Sweating)

Hyperhidrosis is a medical condition where the sweat glands become overactive, leading to excessive sweating. It can occur in just one area, such as the armpits, feet, or hands; or it can be general sweating over the entire body. Hyperhidrosis can happen to people of all ages and genders. It is estimated that the condition affects as many as 3% of all people, but many are never diagnosed because they are too embarrassed to talk about their symptoms with their doctor.

When excessive sweating is the main complaint and is not related to any other condition, it is called primary hyperhidrosis. There is no known cause, but it does tend to run in families. Secondary hyperhidrosis is sweating that is caused by another medical condition, such as anxiety, cancer, hyperthyroidism, or menopause. Sometimes treating the underlying condition can improve this type of sweating.

There are tests doctors can use to diagnose hyperhidrosis. One involves simply soaking up the perspiration with paper and then weighing the paper to measure how much extra sweat is being produced. Another test, called the starch-iodine test, involves covering the body with powder. This powder turns blue in any areas where sweat is produced.

Treatment depends on the severity of the hyperhidrosis and the areas affected. Some options are:

Prescription antiperspirants, which contain aluminum chloride and work by plugging the sweat ducts. This signals the sweat glands to decrease sweat production. They work for moderate cases of hyperhidrosis and are relatively affordable.
Lontophoresis, a procedure that uses small amounts of electricity and a tray of tap water to decrease production of sweat glands in the hands or feet.
Botox, which can be injected into the nerves that control sweat glands in the underarms.
Sympathectomy, a surgery for severe cases that can be performed to cut the nerves that stimulate sweat production. Sympathectomy is most effective for hyperhidrosis of the hands. It may cause new symptoms of sweating elsewhere on the body.
Surgery to remove sweat glands, most often in the underarms.

Hyperhidrosis is a serious medical condition that causes both physical and emotional distress. Treatments are available, and support groups exist to help patients cope.

Noteworthy Medicare Patient Procedures Performed by Dr. Shereen J. Chang, MD in 2023

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

Top 5%

By Volume:

thyroid blood test

By Affordability:

hospital care

inpatient care

inpatient hospital care

thyroid blood test

thyroid function tests

vitamin B12 test

In 2023, among providers in related specialties within Iowa, Dr. Shereen J. Chang, MD performed more thyroid blood test procedures for Medicare patients than 95% of them and she also had a list price for hospital care, inpatient care, inpatient hospital care (for patient admitted to hospital), thyroid blood test, thyroid function tests, and vitamin B12 test that was lower than the list prices billed to Medicare by 95% of them. 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 25%

By Affordability:

blood draw

blood draw for lab tests

phlebotomy for lab tests

venipuncture

In 2012, Dr. Shereen J. Chang, MD had a list price for blood draw, blood draw for lab tests, phlebotomy for lab tests, and venipuncture (phlebotomy) that was lower than the list prices billed to Medicare by 75% of providers in related specialties within Iowa. 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. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2012 were diagnostic procedures, hospital care, inpatient care and blood draw.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	55
diagnostic procedures	1037
doctor visit	379
electroencephalography (EEG)	18
hospital care	213
injections	33
inpatient care	213
minimally invasive procedures	33

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2013 were hospital care, inpatient care, diagnostic procedures and lab tests.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	69
brain imaging (neuroimaging)	13
diagnostic procedures	143
doctor visit	445
electroencephalography (EEG)	20
hospital care	207
inpatient care	207
lab tests	97
MRI (magnetic resonance imaging)	13
thyroid function tests	61

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	240
Female	367

**Ethnicity**
Non-Hispanic White	582
Black	11
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	192
From 75 to 84	205
85 and over	82
Less than 65	128

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2013

Hypertension	68
High Cholesterol	56
Stroke	17
Ischemic Heart Disease	33
Depression	38
Chronic Kidney Disease	21
Asthma	8
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	15
Chronic Obstructive Pulmonary Disease	16
Diabetes	30
Dementia	19
Cancer	9

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2014 were hospital care, inpatient care, diagnostic procedures and minimally invasive procedures.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	40
brain imaging (neuroimaging)	22
diagnostic procedures	108
doctor visit	381
electroencephalography (EEG)	14
hospital care	179
injections	56
inpatient care	179
lab tests	45
minimally invasive procedures	56
MRI (magnetic resonance imaging)	22
thyroid function tests	22

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	233
Female	329

**Ethnicity**
Non-Hispanic White	537
Black	14
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	185
From 75 to 84	186
85 and over	79
Less than 65	112

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2014

Hypertension	66
High Cholesterol	53
Stroke	19
Ischemic Heart Disease	34
Depression	30
Chronic Kidney Disease	21
Asthma	7
Osteoperosis	9
Atrial Fibrilation	15
Heart Failure	17
Chronic Obstructive Pulmonary Disease	18
Diabetes	30
Dementia	17
Cancer	8

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2015 were hospital care, inpatient care, diagnostic procedures and lab tests.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	45
brain imaging (neuroimaging)	17
diagnostic procedures	108
doctor visit	389
electroencephalography (EEG)	13
hospital care	123
inpatient care	123
lab tests	56
MRI (magnetic resonance imaging)	17
thyroid function tests	39

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	406
Female	634

**Ethnicity**
Non-Hispanic White	980
Black	34
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	384
From 75 to 84	318
85 and over	126
Less than 65	212

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2015

Hypertension	65
High Cholesterol	60
Stroke	17
Ischemic Heart Disease	32
Depression	36
Chronic Kidney Disease	24
Asthma	12
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	18
Chronic Obstructive Pulmonary Disease	18
Diabetes	29
Dementia	19
Cancer	7

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2016 were diagnostic procedures, hospital care, inpatient care and lab tests.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	35
brain imaging (neuroimaging)	14
diagnostic procedures	107
doctor visit	336
hospital care	96
inpatient care	96
lab tests	54
MRI (magnetic resonance imaging)	14
thyroid function tests	39

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	199
Female	277

**Ethnicity**
Non-Hispanic White	454
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	156
From 75 to 84	139
85 and over	62
Less than 65	119

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2016

Hypertension	70
High Cholesterol	59
Stroke	16
Ischemic Heart Disease	33
Depression	37
Chronic Kidney Disease	33
Asthma	20
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	19
Chronic Obstructive Pulmonary Disease	17
Diabetes	31
Dementia	16
Cancer	9

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2017 were hospital care, inpatient care, diagnostic procedures and minimally invasive procedures.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	41
diagnostic procedures	96
doctor visit	334
electroencephalography (EEG)	11
hospital care	155
injections	94
inpatient care	155
lab tests	54
minimally invasive procedures	94
thyroid function tests	38

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	206
Female	287

**Ethnicity**
Non-Hispanic White	457
Black	17
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	186
From 75 to 84	136
85 and over	49
Less than 65	122

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2017

Hypertension	68
High Cholesterol	60
Stroke	19
Ischemic Heart Disease	33
Depression	40
Chronic Kidney Disease	35
Asthma	11
Osteoperosis	12
Atrial Fibrilation	10
Heart Failure	19
Chronic Obstructive Pulmonary Disease	20
Diabetes	29
Dementia	15
Cancer	9

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2018 were diagnostic procedures, minimally invasive procedures, injections and hospital care.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	27
diagnostic procedures	120
doctor visit	361
hospital care	63
injections	108
inpatient care	63
lab tests	38
minimally invasive procedures	108
thyroid function tests	26

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	203
Female	297

**Ethnicity**
Non-Hispanic White	473
Black	11
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	200
From 75 to 84	144
85 and over	51
Less than 65	105

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2018

Hypertension	73
High Cholesterol	67
Stroke	15
Ischemic Heart Disease	38
Depression	43
Chronic Kidney Disease	38
Asthma	11
Osteoperosis	11
Atrial Fibrilation	12
Heart Failure	19
Chronic Obstructive Pulmonary Disease	21
Diabetes	35
Dementia	16
Cancer	9

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2019 were minimally invasive procedures, injections, diagnostic procedures and hospital care.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	31
diagnostic procedures	109
doctor visit	293
hospital care	108
injections	141
inpatient care	108
lab tests	40
minimally invasive procedures	141
thyroid function tests	27

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	211
Female	264

**Ethnicity**
Non-Hispanic White	453
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	213
From 75 to 84	117
85 and over	58
Less than 65	87

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2019

Hypertension	70
High Cholesterol	69
Stroke	19
Ischemic Heart Disease	38
Depression	46
Chronic Kidney Disease	33
Asthma	9
Osteoperosis	11
Atrial Fibrilation	11
Heart Failure	20
Chronic Obstructive Pulmonary Disease	19
Diabetes	32
Dementia	17
Cancer	10

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2020 were hospital care, inpatient care, diagnostic procedures and minimally invasive procedures.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	24
diagnostic procedures	105
doctor visit	191
hospital care	126
injections	82
inpatient care	126
lab tests	12
minimally invasive procedures	82

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	186
Female	227

**Ethnicity**
Non-Hispanic White	399
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	168
From 75 to 84	136
85 and over	40
Less than 65	69

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2020

Hypertension	67
High Cholesterol	66
Stroke	18
Ischemic Heart Disease	36
Depression	36
Chronic Kidney Disease	35
Asthma	6
Osteoperosis	11
Atrial Fibrilation	13
Heart Failure	21
Chronic Obstructive Pulmonary Disease	15
Diabetes	31
Dementia	18
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2021 were diagnostic procedures, hospital care, inpatient care and minimally invasive procedures.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	21
diagnostic procedures	173
doctor visit	209
hospital care	123
injections	110
inpatient care	123
lab tests	45
minimally invasive procedures	110
thyroid function tests	30

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	213
Female	288

**Ethnicity**
Non-Hispanic White	474
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	229
From 75 to 84	162
85 and over	52
Less than 65	58

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2021

Hypertension	73
High Cholesterol	68
Stroke	22
Ischemic Heart Disease	31
Depression	39
Chronic Kidney Disease	33
Asthma	11
Osteoperosis	13
Atrial Fibrilation	11
Heart Failure	18
Chronic Obstructive Pulmonary Disease	11
Diabetes	30
Dementia	13
Cancer	8

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA during 2022 were diagnostic procedures, hospital care, inpatient care and minimally invasive procedures.

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

blood draw	19
diagnostic procedures	155
doctor visit	234
hospital care	149
injections	96
inpatient care	149
minimally invasive procedures	96

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	222
Female	294

**Ethnicity**
Non-Hispanic White	489
Black	0
Hispanic	0
Asian	0
Other	15
Native American	0

**Age**
From 65 to 74	224
From 75 to 84	170
85 and over	61
Less than 65	61

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2022

Hypertension	72
High Cholesterol	75
Stroke	26
Ischemic Heart Disease	27
Depression	32
Chronic Kidney Disease	22
Asthma	11
Osteoperosis	16
Atrial Fibrilation	19
Heart Failure	16
Chronic Obstructive Pulmonary Disease	11
Diabetes	28
Dementia	12
Cancer	11

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Shereen J. Chang, MD for Medicare patients.

The highest averages for the top procedures that Dr. Shereen J. Chang, MD treated as a neurologist in Cedar Rapids, IA were diagnostic procedures, hospital care, inpatient care and minimally invasive procedures.

blood draw	37
brain imaging (neuroimaging)	16
diagnostic procedures	205
doctor visit	322
electroencephalography (EEG)	15
hospital care	140
injections	90
inpatient care	140
lab tests	49
minimally invasive procedures	90
MRI (magnetic resonance imaging)	16
thyroid function tests	35

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Shereen J. Chang, MD.

**Gender**
Male	210
Female	296

**Ethnicity**
Black / African American	7
Asian / Pacific Islander	0
Non-Hispanic White	481
Native American / Alaskan Native	0
Hispanic	0
Other	1

**Age**
75 to 84	155
85 and over	60
Less than 65	97
65 to 74	194

Average of Total of Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Shereen J. Chang, MD treated were hypertension, high cholesterol, depression and ischemic heart disease.

Hypertension	62
High Cholesterol	57
Stroke	17
Ischemic Heart Disease	30
Depression	34
Chronic Kidney Disease	26
Asthma	9
Osteoporosis	10
Heart Failure	16
Chronic Obstructive Pulmonary Disease	15
Diabetes	27
Atrial Fibrillation	11
Dementia	14
Cancer	8

Education & Training

Dr. Shereen J. Chang, MD graduated from University of Iowa, Carver College of Medicine. She completed residency at University of Iowa Hospitals & Clinics. She is certified by the American Board of Psychiatry and Neurology and has a state license in Iowa.

Medical School: University of Iowa, Carver College of Medicine

Residency: University of Iowa Hospitals & Clinics

Board Certification: American Board of Psychiatry and Neurology

Licensed In: Iowa

Affiliations & Hospitals

Dr. Shereen J. Chang, MD is associated with these hospitals and organizations:

Mercy Hospital

UnityPoint Health

Physicians' Clinic of Iowa, P.C.

St. Luke's Hospital

PHYSICIANS' CLINIC OF IOWA, PC

Ratings & Reviews

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General Payments

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

**Payments by Company**
Cyberonics, Inc.	$1,976 VNS Therapy $1,976
Allergan, Inc.	$420 BOTOX $375	UBRELVY $45
Biogen Idec Inc.	$244 TECFIDERA $137	TYSABRI $54	AVONEX $52
Allergan Inc.	$231 NAMZARIC $101	BOTOX - NEUROLOGY $75	BOTOX $42	NAMENDA XR $13
Supernus Pharmaceuticals, Inc.	$165 TROKENDI XR $119	OXTELLAR XR $45
Other	$2,008 Gilenya $97	APOKYN $92	SOLIRIS $76	Gamunex-C $66	Duopa $65	Other $1,613

**Types of Payments**
Food and Beverage	$3,004
Travel and Lodging	$1,868
Education	$127
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$44

Biography

Dr. Shereen Chang is a neurology (brain & spinal cord disease) specialist in Cedar Rapids, IA. Clinical interests for Dr. Chang include general neurology, hemifacial spasm, and hyperhidrosis (excessive sweating). She is affiliated with UnityPoint Health, Physicians' Clinic of Iowa, P.C., and St. Luke's Hospital. Her practice in Cedar Rapids, IA is open to new patients as reported by UnityPoint Health. After attending the University of Iowa, Carver College of Medicine for medical school, she completed her residency training at the University of Iowa Hospitals & Clinics.

Select Year:

Dr. Shereen J. Chang, MD

Office Locations

Some issues Dr. Shereen J. Chang, MD can help you with:

Noteworthy Medicare Patient Procedures Performed by Dr. Shereen J. Chang, MD in 2023

By Volume:

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. Shereen J. Chang, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Shereen J. Chang, 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. Shereen J. Chang, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

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