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Home > CA Providers > Diagnostic Radiologists

Dr. Rachel A. Knopoff, MD

(Dr. Rachel Knopoff, M.D.)

(No ratings)

Specializes in: Diagnostic Radiology

University of California, San Francisco (UCSF), School of Medicine

Professional interests include: breast imaging

3330 Lomita Boulevard Radiology Department
Torrance, CA 90505

(310) 517-4675

Dr. Rachel A. Knopoff, MD is a diagnostic radiologist in Torrance, CA specializing in diagnostic radiology. She graduated from University of California, San Francisco (UCSF), School of Medicine. Dr. Rachel A. Knopoff, MD is affiliated with Torrance Memorial.

Office Locations

Torrance Memorial

3330 Lomita Boulevard Radiology Department
Torrance, CA 90505

(310) 517-4745

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In The News

“The hospital also bought a new scanner that automatically reduces the amount of radiation patients receive, said Dr. Rachel Knopoff, chair of the hospital's Radiology Department.”—"South Bay hospitals compare favorably on consumer website", Daily Breeze, July 2010

Noteworthy Medicare Patient Procedures Performed by Dr. Rachel A. Knopoff, MD in 2023

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

Top 5%

By Affordability:

2-D diagnostic mammogram

targeted breast ultrasound

whole breast ultrasound

women's imaging

In 2023, Dr. Rachel A. Knopoff, MD had a list price for 2-D diagnostic mammogram, 2-D mammogram, breast imaging, breast ultrasound, diagnostic imaging, diagnostic mammogram, joint X-ray, knee X-ray, mammogram (breast X-ray), pelvis X-ray, peripheral DEXA, screening mammogram, spine X-ray, targeted breast ultrasound, whole breast ultrasound, and women's imaging 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 25%

By Volume:

central DEXA

ultrasound

X-rays

By Affordability:

complete abdominal ultrasound

limited abdominal ultrasound

pelvic MRI

retroperitoneal ultrasound

transabdominal ultrasound

X-rays

In 2012, among providers in related specialties within California, Dr. Rachel A. Knopoff, MD performed more central DEXA, ultrasound (sonogram), and X-rays procedures for Medicare patients than 75% of them and she also had a list price for complete abdominal ultrasound, limited abdominal ultrasound, pelvic MRI, retroperitoneal ultrasound, transabdominal ultrasound, and X-rays 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. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2012 were X-rays, thoracic (chest) imaging, ultrasound (sonogram) and CT scan.

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	570
brain imaging (neuroimaging)	216
breast procedures	254
cardiac procedures	29
catheterization	71
CT scan	573
diagnostic imaging	37
hip imaging	54
MRI (magnetic resonance imaging)	102
musculoskeletal imaging	186
neck imaging	39
nuclear scan	51
pelvic imaging	301
preventive care	174
spinal procedures	56
stress testing	29
thoracic (chest) imaging	1187
ultrasound (sonogram)	590
vascular procedures	155
women's imaging	280
X-rays	1480

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2013 were X-rays, thoracic (chest) imaging, ultrasound (sonogram) and abdominal imaging.

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	615
brain imaging (neuroimaging)	171
breast procedures	200
cardiac procedures	46
catheterization	42
CT scan	501
diagnostic imaging	39
hip imaging	33
MRI (magnetic resonance imaging)	67
musculoskeletal imaging	180
neck imaging	36
nuclear scan	59
pelvic imaging	305
preventive care	115
spinal procedures	17
stress testing	46
thoracic (chest) imaging	1006
ultrasound (sonogram)	654
vascular procedures	168
women's imaging	231
X-rays	1250

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	802
Female	1366

**Ethnicity**
Non-Hispanic White	1305
Black	175
Hispanic	297
Asian	333
Other	0
Native American	0

**Age**
From 65 to 74	728
From 75 to 84	756
85 and over	458
Less than 65	226

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2013

Hypertension	75
High Cholesterol	66
Stroke	9
Ischemic Heart Disease	43
Depression	23
Chronic Kidney Disease	40
Asthma	9
Osteoperosis	14
Atrial Fibrilation	17
Heart Failure	31
Chronic Obstructive Pulmonary Disease	19
Diabetes	40
Dementia	21
Cancer	16

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2014 were X-rays, thoracic (chest) imaging, ultrasound (sonogram) and abdominal imaging.

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	545
brain imaging (neuroimaging)	180
breast procedures	210
cardiac procedures	43
catheterization	29
CT scan	485
diagnostic imaging	43
hip imaging	35
MRI (magnetic resonance imaging)	84
musculoskeletal imaging	165
neck imaging	36
nuclear scan	43
pelvic imaging	282
preventive care	119
spinal procedures	28
stress testing	43
thoracic (chest) imaging	930
ultrasound (sonogram)	643
vascular procedures	208
women's imaging	243
X-rays	1172

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	768
Female	1322

**Ethnicity**
Non-Hispanic White	1340
Black	156
Hispanic	258
Asian	277
Other	0
Native American	0

**Age**
From 65 to 74	750
From 75 to 84	727
85 and over	439
Less than 65	174

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2014

Hypertension	75
High Cholesterol	63
Stroke	11
Ischemic Heart Disease	42
Depression	21
Chronic Kidney Disease	38
Asthma	11
Osteoperosis	13
Atrial Fibrilation	18
Heart Failure	30
Chronic Obstructive Pulmonary Disease	17
Diabetes	40
Dementia	20
Cancer	18

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2015 were X-rays, thoracic (chest) imaging, ultrasound (sonogram) and abdominal imaging.

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	365
aspiration	11
brain imaging (neuroimaging)	126
breast procedures	279
cardiac procedures	27
catheterization	36
CT scan	327
diagnostic imaging	49
diagnostic procedures	15
image guided procedures	15
minimally invasive procedures	15
minor procedures	15
MRI (magnetic resonance imaging)	65
musculoskeletal imaging	142
neck imaging	23
nuclear scan	27
pelvic imaging	205
pleural drainage	11
preventive care	117
stress testing	27
thoracic (chest) imaging	539
ultrasound (sonogram)	474
vascular procedures	142
women's imaging	285
X-rays	781

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	1106
Female	2038

**Ethnicity**
Non-Hispanic White	2132
Black	192
Hispanic	308
Asian	422
Other	0
Native American	0

**Age**
From 65 to 74	1092
From 75 to 84	1102
85 and over	670
Less than 65	280

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2015

Hypertension	75
High Cholesterol	62
Stroke	11
Ischemic Heart Disease	41
Depression	22
Chronic Kidney Disease	39
Asthma	13
Osteoperosis	13
Atrial Fibrilation	18
Heart Failure	29
Chronic Obstructive Pulmonary Disease	18
Diabetes	39
Dementia	20
Cancer	18

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2016 were X-rays, thoracic (chest) imaging, ultrasound (sonogram) and abdominal imaging.

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	362
brain imaging (neuroimaging)	154
breast procedures	331
cardiac procedures	24
catheterization	24
CT scan	358
diagnostic imaging	50
diagnostic procedures	14
image guided procedures	14
minimally invasive procedures	14
minor procedures	14
MRI (magnetic resonance imaging)	57
musculoskeletal imaging	155
nuclear scan	24
pelvic imaging	178
preventive care	159
spinal procedures	12
stress testing	24
thoracic (chest) imaging	650
ultrasound (sonogram)	440
vascular procedures	115
women's imaging	335
X-rays	946

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	578
Female	1122

**Ethnicity**
Non-Hispanic White	1109
Black	111
Hispanic	187
Asian	230
Other	63
Native American	0

**Age**
From 65 to 74	634
From 75 to 84	578
85 and over	355
Less than 65	133

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2016

Hypertension	75
High Cholesterol	62
Stroke	8
Ischemic Heart Disease	41
Depression	21
Chronic Kidney Disease	43
Asthma	20
Osteoperosis	11
Atrial Fibrilation	18
Heart Failure	30
Chronic Obstructive Pulmonary Disease	19
Diabetes	39
Dementia	19
Cancer	18

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2017 were X-rays, thoracic (chest) imaging, ultrasound (sonogram) and breast procedures.

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	320
brain imaging (neuroimaging)	119
breast procedures	404
cardiac procedures	40
catheterization	17
CT scan	319
diagnostic imaging	64
diagnostic procedures	16
image guided procedures	16
minimally invasive procedures	16
minor procedures	16
MRI (magnetic resonance imaging)	47
musculoskeletal imaging	288
nuclear scan	40
pelvic imaging	178
preventive care	150
stress testing	40
thoracic (chest) imaging	599
ultrasound (sonogram)	430
vascular procedures	83
women's imaging	401
X-rays	1028

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	545
Female	1116

**Ethnicity**
Non-Hispanic White	1028
Black	122
Hispanic	171
Asian	273
Other	0
Native American	0

**Age**
From 65 to 74	652
From 75 to 84	545
85 and over	344
Less than 65	120

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2017

Hypertension	73
High Cholesterol	58
Stroke	9
Ischemic Heart Disease	39
Depression	23
Chronic Kidney Disease	42
Asthma	9
Osteoperosis	16
Atrial Fibrilation	17
Heart Failure	29
Chronic Obstructive Pulmonary Disease	15
Diabetes	37
Dementia	20
Cancer	18

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2018 were X-rays, ultrasound (sonogram), CT scan and women's imaging.

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	292
brain imaging (neuroimaging)	141
breast procedures	305
cardiac procedures	36
catheterization	21
CT scan	331
diagnostic imaging	55
MRI (magnetic resonance imaging)	49
musculoskeletal imaging	247
nuclear scan	36
pelvic imaging	164
preventive care	102
spinal procedures	12
stress testing	36
thoracic (chest) imaging	74
ultrasound (sonogram)	367
vascular procedures	68
women's imaging	316
X-rays	416

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	528
Female	1090

**Ethnicity**
Non-Hispanic White	1037
Black	112
Hispanic	178
Asian	224
Other	0
Native American	0

**Age**
From 65 to 74	647
From 75 to 84	536
85 and over	327
Less than 65	108

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2018

Hypertension	74
High Cholesterol	65
Stroke	9
Ischemic Heart Disease	38
Depression	24
Chronic Kidney Disease	44
Asthma	8
Osteoperosis	16
Atrial Fibrilation	17
Heart Failure	27
Chronic Obstructive Pulmonary Disease	14
Diabetes	35
Dementia	20
Cancer	18

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2019 were X-rays, women's imaging, breast procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	304
brain imaging (neuroimaging)	112
breast procedures	538
cardiac procedures	28
CT scan	290
diagnostic imaging	65
MRI (magnetic resonance imaging)	84
musculoskeletal imaging	352
nuclear scan	28
pelvic imaging	149
preventive care	299
stress testing	28
thoracic (chest) imaging	71
ultrasound (sonogram)	388
vascular procedures	78
women's imaging	549
X-rays	716

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	507
Female	1322

**Ethnicity**
Non-Hispanic White	1168
Black	120
Hispanic	197
Asian	254
Other	0
Native American	0

**Age**
From 65 to 74	737
From 75 to 84	616
85 and over	339
Less than 65	137

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2019

Hypertension	73
High Cholesterol	66
Stroke	7
Ischemic Heart Disease	38
Depression	24
Chronic Kidney Disease	45
Asthma	9
Osteoperosis	19
Atrial Fibrilation	16
Heart Failure	27
Chronic Obstructive Pulmonary Disease	15
Diabetes	34
Dementia	19
Cancer	17

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2020 were X-rays, women's imaging, breast procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	309
brain imaging (neuroimaging)	119
breast procedures	451
cardiac procedures	26
CT scan	321
diagnostic imaging	59
MRI (magnetic resonance imaging)	52
musculoskeletal imaging	266
nuclear scan	26
pelvic imaging	161
preventive care	242
spinal procedures	11
stress testing	26
thoracic (chest) imaging	56
ultrasound (sonogram)	352
vascular procedures	91
women's imaging	451
X-rays	578

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	516
Female	1166

**Ethnicity**
Non-Hispanic White	1045
Black	129
Hispanic	193
Asian	248
Other	0
Native American	0

**Age**
From 65 to 74	680
From 75 to 84	576
85 and over	295
Less than 65	131

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2020

Hypertension	71
High Cholesterol	67
Stroke	8
Ischemic Heart Disease	38
Depression	25
Chronic Kidney Disease	45
Asthma	9
Osteoperosis	18
Atrial Fibrilation	14
Heart Failure	26
Chronic Obstructive Pulmonary Disease	13
Diabetes	36
Dementia	21
Cancer	19

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2021 were X-rays, breast procedures, women's imaging and ultrasound (sonogram).

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	383
brain imaging (neuroimaging)	155
breast procedures	740
cardiac procedures	28
CT scan	410
diagnostic imaging	84
diagnostic procedures	14
image guided procedures	14
minimally invasive procedures	14
minor procedures	14
MRI (magnetic resonance imaging)	95
musculoskeletal imaging	430
nuclear scan	28
pelvic imaging	218
preventive care	442
spinal procedures	37
stress testing	28
thoracic (chest) imaging	84
ultrasound (sonogram)	522
vascular procedures	173
women's imaging	726
X-rays	990

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	568
Female	1672

**Ethnicity**
Non-Hispanic White	1359
Black	149
Hispanic	286
Asian	330
Other	0
Native American	0

**Age**
From 65 to 74	954
From 75 to 84	744
85 and over	402
Less than 65	140

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2021

Hypertension	72
High Cholesterol	71
Stroke	7
Ischemic Heart Disease	35
Depression	25
Chronic Kidney Disease	41
Asthma	8
Osteoperosis	21
Atrial Fibrilation	15
Heart Failure	25
Chronic Obstructive Pulmonary Disease	10
Diabetes	34
Dementia	20
Cancer	17

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA during 2022 were X-rays, women's imaging, breast procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

abdominal imaging	403
brain imaging (neuroimaging)	216
breast procedures	833
cardiac procedures	28
CT scan	498
diagnostic imaging	95
diagnostic procedures	17
image guided procedures	17
minimally invasive procedures	17
minor procedures	17
MRI (magnetic resonance imaging)	105
musculoskeletal imaging	404
neck imaging	18
nuclear scan	28
pelvic imaging	252
preventive care	499
spinal procedures	17
stress testing	28
thoracic (chest) imaging	100
ultrasound (sonogram)	554
vascular procedures	153
women's imaging	836
X-rays	1011

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	661
Female	1734

**Ethnicity**
Non-Hispanic White	1512
Black	154
Hispanic	261
Asian	340
Other	0
Native American	0

**Age**
From 65 to 74	998
From 75 to 84	858
85 and over	400
Less than 65	139

Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	13
Ischemic Heart Disease	27
Depression	23
Chronic Kidney Disease	32
Asthma	10
Osteoperosis	25
Atrial Fibrilation	21
Heart Failure	21
Chronic Obstructive Pulmonary Disease	14
Diabetes	33
Dementia	12
Cancer	23

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Rachel A. Knopoff, MD for Medicare patients.

The highest averages for the top procedures that Dr. Rachel A. Knopoff, MD treated as a diagnostic radiologist in Torrance, CA were X-rays, ultrasound (sonogram), thoracic (chest) imaging and women's imaging.

abdominal imaging	406
aspiration	11
brain imaging (neuroimaging)	155
breast procedures	413
cardiac procedures	32
catheterization	34
CT scan	401
diagnostic imaging	58
diagnostic procedures	15
hip imaging	40
image guided procedures	15
minimally invasive procedures	15
minor procedures	15
MRI (magnetic resonance imaging)	73
musculoskeletal imaging	255
neck imaging	30
nuclear scan	35
pelvic imaging	217
pleural drainage	11
preventive care	219
spinal procedures	23
stress testing	32
thoracic (chest) imaging	481
ultrasound (sonogram)	492
vascular procedures	130
women's imaging	423
X-rays	942

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Rachel A. Knopoff, MD.

**Gender**
Male	598
Female	1268

**Ethnicity**
Black / African American	129
Asian / Pacific Islander	266
Non-Hispanic White	1185
Native American / Alaskan Native	0
Hispanic	212
Other	5

**Age**
75 to 84	639
85 and over	366
Less than 65	144
65 to 74	715

Average of Total of Conditions of Medicare patients treated by Dr. Rachel A. Knopoff, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Rachel A. Knopoff, MD treated were hypertension, high cholesterol, chronic kidney disease and ischemic heart disease.

Hypertension	67
High Cholesterol	59
Stroke	8
Ischemic Heart Disease	34
Depression	21
Chronic Kidney Disease	37
Asthma	9
Osteoporosis	15
Heart Failure	25
Chronic Obstructive Pulmonary Disease	14
Diabetes	33
Atrial Fibrillation	15
Dementia	17
Cancer	16

Education & Training

Dr. Rachel A. Knopoff, MD graduated from University of California, San Francisco (UCSF), School of Medicine. She completed residency at University of California, Los Angeles (UCLA) Affiliated Hospitals. She has a state license in California.

Medical School: University of California, San Francisco (UCSF), School of Medicine

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

Licensed In: California

Affiliations & Hospitals

Dr. Rachel A. Knopoff, MD is associated with these hospitals and organizations:

Torrance Memorial

Ratings & Reviews

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General Payments

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

**Payments by Company**
HOLOGIC INC	$291 AFFIRM PRONE $291
Pinnacle Biologics, Inc	$125 Photofrin $125
GE Healthcare	$25 $25
Siemens Medical Solutions USA, Inc.	$23 Mammomat Revelation $23
Covidien Sales LLC	$21 Interventional Lung Solutions $21
Other	$39 LYMPHOSEEK $21	Axumin $18

**Types of Payments**
Food and Beverage	$523

Biography

Dr. Rachel Knopoff, who practices in Torrance, CA, is a medical specialist in diagnostic radiology. In Dr. Knopoff's practice, she is particularly interested in breast imaging. She is professionally affiliated with Torrance Memorial Medical Center. Her education and training includes medical school at the University of California, San Francisco (UCSF), School of Medicine and residency at a hospital affiliated with the University of California, Los Angeles (UCLA).