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Home > CA Providers > Diagnostic Radiologists

Dr. Stephen Yan Chun To, MD

(No ratings)

Specializes in: Diagnostic Radiology

1798 N Garey Avenue
Pomona, CA 91767

(909) 865-9532

Dr. Stephen Yan Chun To, MD is a diagnostic radiologist in Pomona, CA specializing in diagnostic radiology. Dr. Stephen Yan Chun To, MD is affiliated with Pomona Valley Hospital Medical Center.

Office Locations

1798 N Garey Avenue
Pomona, CA 91767

(909) 865-9532

(909) 397-0194

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Pvhmc Radiology Department
Pomona, CA 91767

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Noteworthy Medicare Patient Procedures Performed by Dr. Stephen Yan Chun To, MD in 2023

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

Top 25%

By Volume:

brain imaging

cervical spine CT scan

CT scan

joint X-ray

thoracic imaging

By Affordability:

hand X-ray

maxillofacial CT scan

In 2012, among providers in related specialties within California, Dr. Stephen Yan Chun To, MD performed more brain imaging (neuroimaging), cervical (neck) spine CT scan, CT scan, joint X-ray, and thoracic (chest) imaging procedures for Medicare patients than 75% of them and he also had a list price for hand X-ray, maxillofacial (jaw/face) CT scan, neck X-ray, pelvic CT scan, thoracic (chest) imaging, and women's imaging that was lower than the list prices billed to Medicare by 75% 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.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2012 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	428
angioplasty	33
brain imaging (neuroimaging)	238
catheterization	36
CT scan	663
device removal	13
dialysis access procedures	53
hip imaging	113
minimally invasive procedures	16
MRI (magnetic resonance imaging)	25
musculoskeletal imaging	318
neck imaging	12
nuclear scan	15
pelvic imaging	284
spinal procedures	294
thoracic (chest) imaging	1349
thrombectomy (blood clot removal)	16
ultrasound (sonogram)	262
vascular procedures	190
women's imaging	12
X-rays	1954

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2013 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	383
aspiration	36
brain imaging (neuroimaging)	209
cardiac procedures	15
catheterization	32
CT scan	641
device removal	14
dialysis access procedures	16
hip imaging	84
MRI (magnetic resonance imaging)	17
musculoskeletal imaging	254
neck imaging	36
nuclear scan	15
pelvic imaging	294
pleural drainage	14
spinal procedures	220
stress testing	15
thoracic (chest) imaging	1170
ultrasound (sonogram)	277
vascular procedures	122
women's imaging	13
X-rays	1576

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	883
Female	1250

**Ethnicity**
Non-Hispanic White	860
Black	215
Hispanic	779
Asian	234
Other	0
Native American	0

**Age**
From 65 to 74	735
From 75 to 84	585
85 and over	371
Less than 65	442

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2013

Hypertension	75
High Cholesterol	57
Stroke	14
Ischemic Heart Disease	52
Depression	27
Chronic Kidney Disease	40
Asthma	11
Osteoperosis	16
Atrial Fibrilation	16
Heart Failure	45
Chronic Obstructive Pulmonary Disease	27
Diabetes	51
Dementia	23
Cancer	11

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2014 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	374
angioplasty	22
aspiration	34
brain imaging (neuroimaging)	219
cardiac procedures	27
catheterization	14
CT scan	598
device removal	18
dialysis access procedures	39
hip imaging	104
MRI (magnetic resonance imaging)	27
musculoskeletal imaging	256
neck imaging	12
nuclear scan	38
pelvic imaging	296
pleural drainage	13
spinal procedures	262
stress testing	27
thoracic (chest) imaging	1169
ultrasound (sonogram)	271
vascular procedures	157
women's imaging	11
X-rays	1660

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	953
Female	1247

**Ethnicity**
Non-Hispanic White	919
Black	215
Hispanic	769
Asian	259
Other	0
Native American	0

**Age**
From 65 to 74	760
From 75 to 84	671
85 and over	358
Less than 65	411

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2014

Hypertension	75
High Cholesterol	59
Stroke	13
Ischemic Heart Disease	50
Depression	25
Chronic Kidney Disease	42
Asthma	12
Osteoperosis	14
Atrial Fibrilation	14
Heart Failure	43
Chronic Obstructive Pulmonary Disease	26
Diabetes	50
Dementia	22
Cancer	12

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2015 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	420
angioplasty	12
aspiration	12
brain imaging (neuroimaging)	279
breast procedures	157
cardiac procedures	37
catheterization	27
CT scan	670
device removal	12
diagnostic imaging	17
dialysis access procedures	20
hip imaging	108
MRI (magnetic resonance imaging)	37
musculoskeletal imaging	249
neck imaging	16
nuclear scan	37
pelvic imaging	336
pleural drainage	12
preventive care	119
spinal procedures	206
stress testing	37
thoracic (chest) imaging	1442
ultrasound (sonogram)	362
vascular procedures	171
women's imaging	171
X-rays	2014

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	1964
Female	3020

**Ethnicity**
Non-Hispanic White	2212
Black	498
Hispanic	1636
Asian	534
Other	0
Native American	0

**Age**
From 65 to 74	1758
From 75 to 84	1416
85 and over	834
Less than 65	976

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2015

Hypertension	75
High Cholesterol	59
Stroke	15
Ischemic Heart Disease	49
Depression	25
Chronic Kidney Disease	43
Asthma	20
Osteoperosis	13
Atrial Fibrilation	16
Heart Failure	43
Chronic Obstructive Pulmonary Disease	26
Diabetes	48
Dementia	22
Cancer	12

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2016 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	483
aspiration	29
brain imaging (neuroimaging)	419
cardiac procedures	31
CT scan	778
MRI (magnetic resonance imaging)	72
musculoskeletal imaging	203
neck imaging	45
nuclear scan	31
pelvic imaging	308
pleural drainage	14
spinal procedures	264
stress testing	31
thoracic (chest) imaging	1678
ultrasound (sonogram)	338
vascular procedures	201
X-rays	2082

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	1072
Female	1477

**Ethnicity**
Non-Hispanic White	1079
Black	240
Hispanic	863
Asian	299
Other	0
Native American	0

**Age**
From 65 to 74	864
From 75 to 84	732
85 and over	428
Less than 65	525

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2016

Hypertension	75
High Cholesterol	58
Stroke	17
Ischemic Heart Disease	50
Depression	27
Chronic Kidney Disease	48
Asthma	28
Osteoperosis	13
Atrial Fibrilation	16
Heart Failure	44
Chronic Obstructive Pulmonary Disease	26
Diabetes	51
Dementia	23
Cancer	12

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2017 were X-rays, thoracic (chest) imaging, CT scan and abdominal imaging.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	476
aspiration	29
brain imaging (neuroimaging)	407
cardiac procedures	17
CT scan	905
MRI (magnetic resonance imaging)	59
musculoskeletal imaging	236
nuclear scan	17
pelvic imaging	335
pleural drainage	14
spinal procedures	228
stress testing	17
thoracic (chest) imaging	1454
ultrasound (sonogram)	281
vascular procedures	146
X-rays	1768

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	1034
Female	1399

**Ethnicity**
Non-Hispanic White	1084
Black	191
Hispanic	772
Asian	315
Other	0
Native American	0

**Age**
From 65 to 74	858
From 75 to 84	680
85 and over	431
Less than 65	464

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2017

Hypertension	75
High Cholesterol	56
Stroke	14
Ischemic Heart Disease	47
Depression	28
Chronic Kidney Disease	52
Asthma	11
Osteoperosis	14
Atrial Fibrilation	17
Heart Failure	42
Chronic Obstructive Pulmonary Disease	24
Diabetes	50
Dementia	25
Cancer	12

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2018 were CT scan, brain imaging (neuroimaging), X-rays and abdominal imaging.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	456
aspiration	19
brain imaging (neuroimaging)	532
breast procedures	24
CT scan	1146
MRI (magnetic resonance imaging)	60
musculoskeletal imaging	220
neck imaging	11
pelvic imaging	356
pleural drainage	19
preventive care	24
spinal procedures	259
thoracic (chest) imaging	224
ultrasound (sonogram)	241
vascular procedures	147
women's imaging	24
X-rays	462

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	1084
Female	1427

**Ethnicity**
Non-Hispanic White	1090
Black	205
Hispanic	797
Asian	357
Other	0
Native American	0

**Age**
From 65 to 74	903
From 75 to 84	711
85 and over	441
Less than 65	456

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2018

Hypertension	75
High Cholesterol	64
Stroke	15
Ischemic Heart Disease	49
Depression	28
Chronic Kidney Disease	52
Asthma	10
Osteoperosis	14
Atrial Fibrilation	17
Heart Failure	42
Chronic Obstructive Pulmonary Disease	24
Diabetes	50
Dementia	24
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2019 were CT scan, abdominal imaging, X-rays and brain imaging (neuroimaging).

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	490
aspiration	36
brain imaging (neuroimaging)	463
CT scan	1106
MRI (magnetic resonance imaging)	57
musculoskeletal imaging	237
neck imaging	19
nuclear scan	11
pelvic imaging	359
pleural drainage	20
spinal procedures	268
thoracic (chest) imaging	257
ultrasound (sonogram)	268
vascular procedures	108
X-rays	475

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	1078
Female	1486

**Ethnicity**
Non-Hispanic White	1122
Black	209
Hispanic	797
Asian	349
Other	0
Native American	0

**Age**
From 65 to 74	955
From 75 to 84	713
85 and over	480
Less than 65	416

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2019

Hypertension	75
High Cholesterol	64
Stroke	15
Ischemic Heart Disease	47
Depression	28
Chronic Kidney Disease	51
Asthma	10
Osteoperosis	13
Atrial Fibrilation	16
Heart Failure	42
Chronic Obstructive Pulmonary Disease	25
Diabetes	50
Dementia	25
Cancer	13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2020 were CT scan, brain imaging (neuroimaging), abdominal imaging and X-rays.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	397
aspiration	39
brain imaging (neuroimaging)	430
CT scan	863
MRI (magnetic resonance imaging)	102
musculoskeletal imaging	117
neck imaging	21
pelvic imaging	246
pleural drainage	18
spinal procedures	211
thoracic (chest) imaging	183
ultrasound (sonogram)	258
vascular procedures	110
X-rays	324

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	893
Female	1220

**Ethnicity**
Non-Hispanic White	967
Black	162
Hispanic	633
Asian	289
Other	0
Native American	0

**Age**
From 65 to 74	765
From 75 to 84	599
85 and over	384
Less than 65	365

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2020

Hypertension	75
High Cholesterol	61
Stroke	15
Ischemic Heart Disease	49
Depression	27
Chronic Kidney Disease	52
Asthma	9
Osteoperosis	13
Atrial Fibrilation	16
Heart Failure	43
Chronic Obstructive Pulmonary Disease	22
Diabetes	48
Dementia	27
Cancer	13

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2021 were CT scan, abdominal imaging, brain imaging (neuroimaging) and X-rays.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	440
brain imaging (neuroimaging)	400
CT scan	863
MRI (magnetic resonance imaging)	119
musculoskeletal imaging	178
neck imaging	28
nuclear scan	17
pelvic imaging	292
spinal procedures	177
thoracic (chest) imaging	162
ultrasound (sonogram)	263
vascular procedures	109
X-rays	300

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	894
Female	1152

**Ethnicity**
Non-Hispanic White	941
Black	171
Hispanic	571
Asian	289
Other	0
Native American	0

**Age**
From 65 to 74	784
From 75 to 84	604
85 and over	358
Less than 65	300

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2021

Hypertension	75
High Cholesterol	66
Stroke	15
Ischemic Heart Disease	47
Depression	27
Chronic Kidney Disease	53
Asthma	9
Osteoperosis	14
Atrial Fibrilation	16
Heart Failure	41
Chronic Obstructive Pulmonary Disease	18
Diabetes	50
Dementia	24
Cancer	13

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA during 2022 were CT scan, brain imaging (neuroimaging), abdominal imaging and X-rays.

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

abdominal imaging	476
brain imaging (neuroimaging)	527
CT scan	1128
MRI (magnetic resonance imaging)	121
musculoskeletal imaging	208
neck imaging	19
pelvic imaging	366
spinal procedures	236
thoracic (chest) imaging	188
ultrasound (sonogram)	252
vascular procedures	125
X-rays	367

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	900
Female	1281

**Ethnicity**
Non-Hispanic White	1024
Black	153
Hispanic	608
Asian	314
Other	0
Native American	0

**Age**
From 65 to 74	861
From 75 to 84	675
85 and over	401
Less than 65	244

Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	24
Ischemic Heart Disease	32
Depression	26
Chronic Kidney Disease	34
Asthma	12
Osteoperosis	19
Atrial Fibrilation	24
Heart Failure	33
Chronic Obstructive Pulmonary Disease	22
Diabetes	48
Dementia	18
Cancer	15

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Stephen Yan Chun To, MD for Medicare patients.

The highest averages for the top procedures that Dr. Stephen Yan Chun To, MD treated as a diagnostic radiologist in Pomona, CA were X-rays, CT scan, thoracic (chest) imaging and abdominal imaging.

abdominal imaging	438
angioplasty	22
aspiration	29
brain imaging (neuroimaging)	374
breast procedures	90
cardiac procedures	25
catheterization	27
CT scan	851
device removal	14
diagnostic imaging	17
dialysis access procedures	32
hip imaging	102
minimally invasive procedures	16
MRI (magnetic resonance imaging)	63
musculoskeletal imaging	225
neck imaging	21
nuclear scan	22
pelvic imaging	315
pleural drainage	15
preventive care	71
spinal procedures	238
stress testing	25
thoracic (chest) imaging	843
thrombectomy (blood clot removal)	16
ultrasound (sonogram)	279
vascular procedures	144
women's imaging	46
X-rays	1180

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Stephen Yan Chun To, MD.

**Gender**
Male	977
Female	1359

**Ethnicity**
Black / African American	205
Asian / Pacific Islander	294
Non-Hispanic White	1027
Native American / Alaskan Native	0
Hispanic	747
Other	0

**Age**
75 to 84	671
85 and over	407
Less than 65	418
65 to 74	840

Average of Total of Conditions of Medicare patients treated by Dr. Stephen Yan Chun To, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Stephen Yan Chun To, MD treated were hypertension, high cholesterol, diabetes and ischemic heart disease.

Hypertension	68
High Cholesterol	56
Stroke	14
Ischemic Heart Disease	42
Depression	24
Chronic Kidney Disease	42
Asthma	12
Osteoporosis	13
Heart Failure	38
Chronic Obstructive Pulmonary Disease	21
Diabetes	45
Atrial Fibrillation	15
Dementia	21
Cancer	11

Education & Training

He completed residency at University of California, Los Angeles (UCLA) Affiliated Hospitals. He is certified by the Certification: Radiology-(General Cert) and has a state license in California.

Residency: University of California, Los Angeles (UCLA) Affiliated Hospitals (1996)

Board Certification: Certification: Radiology-(General Cert)

Licensed In: California

Affiliations & Hospitals

Dr. Stephen Yan Chun To, MD is associated with these hospitals and organizations:

Pomona Valley Hospital Medical Center

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. Stephen Yan Chun To, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
AngioDynamics, Inc.	$943 Auryon Laser System 100-120 Vac $122	$821
ARGON MEDICAL DEVICES, INC.	$542 OPTION $286	SKATER $68	tips $13	$175
Medtronic Vascular, Inc.	$500 HawkOne $311	Anti-restenotic Therapies DCB $127	NanoCross $61
Covidien Sales LLC	$229 PTA $122	Plaque Excision $107
GUERBET LLC	$217 Microcatheters $217
Other	$923 Coils $140	LUTONIX $125	STENTRIEVERS $124	Star $109	ASCENT $97	Other $328

**Types of Payments**
Food and Beverage	$3,354

Biography

Dr. Stephen To is a medical specialist in diagnostic radiology. His education and training includes medical school at the University of California, Los Angeles (UCLA), David Geffen School of Medicine and residency at a hospital affiliated with the University of California, Los Angeles (UCLA). He is affiliated with Pomona Valley Hospital Medical Center.