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Dr. Chrystal Nnenna Obi, MD

(Dr. Chrystal Obi, MD)

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Specializes in: General Practice, Radiology (X-Ray and Medical Imaging) and Pediatrics (Child & Adolescent Medicine)

1975 Fourth Street Second Floor
San Francisco, CA 94158

(510) 428-3380

Dr. Chrystal Nnenna Obi, MD is a general practitioner in San Francisco, CA specializing in general practice, radiology (x-ray and medical imaging) and pediatrics (child & adolescent medicine). Dr. Chrystal Nnenna Obi, MD is affiliated with Regents of the University of California, U.S. Department of Veterans Affairs, Stanford Health Care, Interventional Cardiology Program and SUTTER VALLEY MEDICAL FOUNDATION.

Office Locations

1975 Fourth Street Second Floor
San Francisco, CA 94158

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747 52nd Street
Oakland, CA 94609

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4150 Clement Street San Francisco Vamc (662)
San Francisco, CA 94121

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In The News

“Ellie's mother, Stanford radiologist Chrystal Obi, said in a statement Tuesday that the last time she saw her daughter was Thursday morning when she kissed her goodbye at their Mountain View home...”—"Mother of 3-year-old found at San Jose recycling center 'feared constantly' for daughter's safety", Mercury News, July 2024

Noteworthy Medicare Patient Procedures Performed by Dr. Chrystal Nnenna Obi, MD in 2023

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

Top 10%

By Volume:

abdominal imaging

In 2023, Dr. Chrystal Nnenna Obi, MD performed more abdominal imaging procedures for Medicare patients than 90% of providers in related specialties within California.

Top 25%

By Volume:

CT scan

lower extremity venous duplex

pelvic CT scan

vascular procedures

vascular ultrasound

By Affordability:

spine imaging

X-rays

In 2013, among providers in related specialties within California, Dr. Chrystal Nnenna Obi, MD performed more CT scan, lower extremity venous duplex, pelvic CT scan, vascular procedures, and vascular ultrasound procedures for Medicare patients than 75% of them and she also had a list price for spine imaging, 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

2018 Medicare Procedure Volume

The top procedures that Dr. Chrystal Nnenna Obi, MD treated as a general practitioner in San Francisco, CA during 2018 were ultrasound (sonogram), abdominal imaging, X-rays and musculoskeletal imaging.

Volume of procedures performed by Dr. Chrystal Nnenna Obi, MD for Medicare patients.

abdominal imaging	79
musculoskeletal imaging	22
pelvic imaging	11
ultrasound (sonogram)	110
vascular procedures	20
X-rays	22

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Chrystal Nnenna Obi, MD.

**Gender**
Male	107
Female	167

**Ethnicity**
Non-Hispanic White	149
Black	35
Hispanic	73
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	123
From 75 to 84	72
85 and over	21
Less than 65	58

Conditions of Medicare patients treated by Dr. Chrystal Nnenna Obi, MD in 2018

The most common conditions of Medicare patients that Dr. Chrystal Nnenna Obi, MD treated during 2018 were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	70
High Cholesterol	62
Stroke	7
Ischemic Heart Disease	34
Depression	27
Chronic Kidney Disease	37
Asthma	7
Osteoperosis	6
Atrial Fibrilation	11
Heart Failure	30
Chronic Obstructive Pulmonary Disease	22
Diabetes	45
Dementia	9
Cancer	8

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Chrystal Nnenna Obi, MD treated as a general practitioner in San Francisco, CA during 2019 were ultrasound (sonogram), vascular procedures, abdominal imaging and X-rays.

Volume of procedures performed by Dr. Chrystal Nnenna Obi, MD for Medicare patients.

abdominal imaging	281
breast procedures	94
diagnostic imaging	11
musculoskeletal imaging	30
neck imaging	12
pelvic imaging	33
preventive care	65
spinal procedures	35
ultrasound (sonogram)	615
vascular procedures	285
women's imaging	94
X-rays	141

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Chrystal Nnenna Obi, MD.

**Gender**
Male	423
Female	638

**Ethnicity**
Non-Hispanic White	611
Black	134
Hispanic	237
Asian	51
Other	0
Native American	0

**Age**
From 65 to 74	486
From 75 to 84	282
85 and over	99
Less than 65	194

Conditions of Medicare patients treated by Dr. Chrystal Nnenna Obi, MD in 2019

The most common conditions of Medicare patients that Dr. Chrystal Nnenna Obi, MD treated during 2019 were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	75
High Cholesterol	68
Stroke	6
Ischemic Heart Disease	43
Depression	27
Chronic Kidney Disease	46
Asthma	10
Osteoperosis	9
Atrial Fibrilation	8
Heart Failure	29
Chronic Obstructive Pulmonary Disease	23
Diabetes	49
Dementia	11
Cancer	9

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Chrystal Nnenna Obi, MD treated as a general practitioner in San Francisco, CA during 2020 were ultrasound (sonogram), abdominal imaging, vascular procedures and pelvic imaging.

Volume of procedures performed by Dr. Chrystal Nnenna Obi, MD for Medicare patients.

abdominal imaging	280
musculoskeletal imaging	33
neck imaging	43
pelvic imaging	52
spinal procedures	11
ultrasound (sonogram)	540
vascular procedures	165
women's imaging	22
X-rays	44

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Chrystal Nnenna Obi, MD.

**Gender**
Male	354
Female	512

**Ethnicity**
Non-Hispanic White	476
Black	109
Hispanic	211
Asian	45
Other	0
Native American	0

**Age**
From 65 to 74	374
From 75 to 84	216
85 and over	80
Less than 65	196

Conditions of Medicare patients treated by Dr. Chrystal Nnenna Obi, MD in 2020

The most common conditions of Medicare patients that Dr. Chrystal Nnenna Obi, MD treated during 2020 were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	75
High Cholesterol	67
Stroke	8
Ischemic Heart Disease	42
Depression	24
Chronic Kidney Disease	50
Asthma	11
Osteoperosis	6
Atrial Fibrilation	8
Heart Failure	29
Chronic Obstructive Pulmonary Disease	24
Diabetes	52
Dementia	13
Cancer	12

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Chrystal Nnenna Obi, MD treated as a general practitioner in San Francisco, CA during 2021 were ultrasound (sonogram), abdominal imaging, breast procedures and women's imaging.

Volume of procedures performed by Dr. Chrystal Nnenna Obi, MD for Medicare patients.

abdominal imaging	135
breast procedures	124
diagnostic imaging	12
musculoskeletal imaging	12
neck imaging	25
pelvic imaging	13
preventive care	87
spinal procedures	12
ultrasound (sonogram)	290
vascular procedures	92
women's imaging	124
X-rays	123

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Chrystal Nnenna Obi, MD.

**Gender**
Male	188
Female	375

**Ethnicity**
Non-Hispanic White	330
Black	64
Hispanic	131
Asian	26
Other	0
Native American	0

**Age**
From 65 to 74	269
From 75 to 84	137
85 and over	42
Less than 65	115

Conditions of Medicare patients treated by Dr. Chrystal Nnenna Obi, MD in 2021

The most common conditions of Medicare patients that Dr. Chrystal Nnenna Obi, MD treated during 2021 were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	71
High Cholesterol	68
Stroke	6
Ischemic Heart Disease	37
Depression	23
Chronic Kidney Disease	43
Asthma	12
Osteoperosis	9
Atrial Fibrilation	7
Heart Failure	24
Chronic Obstructive Pulmonary Disease	21
Diabetes	46
Dementia	10
Cancer	9

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Chrystal Nnenna Obi, MD treated as a general practitioner in San Francisco, CA during 2022 were abdominal imaging, ultrasound (sonogram), CT scan and pelvic imaging.

Volume of procedures performed by Dr. Chrystal Nnenna Obi, MD for Medicare patients.

abdominal imaging	90
CT scan	42
pelvic imaging	42
ultrasound (sonogram)	60
vascular procedures	12

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Chrystal Nnenna Obi, MD.

**Gender**
Male	137
Female	192

**Ethnicity**
Non-Hispanic White	231
Black	16
Hispanic	25
Asian	43
Other	0
Native American	0

**Age**
From 65 to 74	115
From 75 to 84	112
85 and over	71
Less than 65	31

Conditions of Medicare patients treated by Dr. Chrystal Nnenna Obi, MD in 2022

The most common conditions of Medicare patients that Dr. Chrystal Nnenna Obi, MD treated during 2022 were high cholesterol, hypertension, chronic kidney disease and diabetes.

Hypertension	75
High Cholesterol	75
Stroke	12
Ischemic Heart Disease	33
Depression	25
Chronic Kidney Disease	47
Asthma	23
Osteoperosis	22
Atrial Fibrilation	29
Heart Failure	32
Chronic Obstructive Pulmonary Disease	23
Diabetes	35
Dementia	18
Cancer	20

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Chrystal Nnenna Obi, MD treated as a general practitioner in San Francisco, CA during 2023 were abdominal imaging, CT scan, pelvic imaging and ultrasound (sonogram).

Volume of procedures performed by Dr. Chrystal Nnenna Obi, MD for Medicare patients.

abdominal imaging	466
CT scan	451
musculoskeletal imaging	22
pelvic imaging	369
spinal procedures	15
thoracic (chest) imaging	95
ultrasound (sonogram)	294
vascular procedures	184
X-rays	63

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Chrystal Nnenna Obi, MD.

**Gender**
Male	886
Female	1164

**Ethnicity**
Non-Hispanic White	1469
Black	104
Hispanic	185
Asian	207
Other	73
Native American	12

**Age**
From 65 to 74	669
From 75 to 84	718
85 and over	403
Less than 65	260

Conditions of Medicare patients treated by Dr. Chrystal Nnenna Obi, MD in 2023

The most common conditions of Medicare patients that Dr. Chrystal Nnenna Obi, MD treated during 2023 were high cholesterol, hypertension, chronic kidney disease and diabetes.

Hypertension	75
High Cholesterol	75
Stroke	15
Ischemic Heart Disease	37
Depression	32
Chronic Kidney Disease	44
Asthma	18
Osteoperosis	19
Atrial Fibrilation	33
Heart Failure	35
Chronic Obstructive Pulmonary Disease	28
Diabetes	38
Dementia	17
Cancer	18

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2018 - 2023

Volume of procedures performed by Dr. Chrystal Nnenna Obi, MD for Medicare patients.

The highest averages for the top procedures that Dr. Chrystal Nnenna Obi, MD treated as a general practitioner in San Francisco, CA were ultrasound (sonogram), CT scan, abdominal imaging and vascular procedures.

abdominal imaging	221
breast procedures	109
CT scan	246
diagnostic imaging	11
musculoskeletal imaging	23
neck imaging	26
pelvic imaging	86
preventive care	76
spinal procedures	18
thoracic (chest) imaging	95
ultrasound (sonogram)	318
vascular procedures	126
women's imaging	80
X-rays	78

Average Medicare Patient Data From 2018 - 2023

Information about Medicare patients treated by Dr. Chrystal Nnenna Obi, MD.

**Gender**
Male	349
Female	508

**Ethnicity**
Black / African American	77
Asian / Pacific Islander	62
Non-Hispanic White	544
Native American / Alaskan Native	2
Hispanic	143
Other	12

**Age**
75 to 84	256
85 and over	119
Less than 65	142
65 to 74	339

Average of Total of Conditions of Medicare patients treated by Dr. Chrystal Nnenna Obi, MD From 2018 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Chrystal Nnenna Obi, MD treated were hypertension, high cholesterol, chronic kidney disease and diabetes.

Hypertension	73
High Cholesterol	69
Stroke	9
Ischemic Heart Disease	37
Depression	26
Chronic Kidney Disease	44
Asthma	13
Osteoporosis	11
Heart Failure	29
Chronic Obstructive Pulmonary Disease	23
Diabetes	44
Atrial Fibrillation	16
Cancer	12
Dementia	13

Education & Training

She has a state license in Nevada.

Licensed In: Nevada

Affiliations & Hospitals

Dr. Chrystal Nnenna Obi, MD is associated with these hospitals and organizations:

Regents of the University of California

U.S. Department of Veterans Affairs

Stanford Health Care

Interventional Cardiology Program

SUTTER VALLEY MEDICAL FOUNDATION

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General Payments

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

**Payments by Company**
Medtronic Vascular, Inc.	$1,412 Endurant $1,412
Stryker Corporation	$307 IVS Vertebral Augmentation Products $307
TERUMO MEDICAL CORPORATION	$285 GlideWire $146	TR Band $131	AZUR $8
Abbott Laboratories	$158 StarClose SE vascular closure system $158
Boston Scientific Corporation	$86 GENERAL VASCULAR INTERVENTION $86
Other	$66 Ruby Coil $66

**Types of Payments**
Travel and Lodging	$1,269
Food and Beverage	$1,045

Biography

Dr. Chrystal Obi is a specialist in general practice and radiology (X-ray and medical imaging). Her professional affiliations include Regents of the University of California, U.S. Department of Veterans Affairs, and Stanford Health Care.