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Home > CA Providers > Spine Surgeons

Dr. Stephen In-Sun Ryu, MD, FACS, MS

Accepting New Patients

(341 Ratings)

Specializes in: Spine Surgery and Neurosurgery

University of California, San Diego (UCSD), School of Medicine

Professional interests include: lumbar stenosis, brain surgery, cervical artificial disc replacement, and more.

300 Pasteur Drive
Palo Alto, CA 94305

(650) 853-2919

Dr. Stephen In-Sun Ryu, MD, FACS, MS is a spine surgeon in Palo Alto, CA specializing in spine surgery and neurosurgery. He graduated from University of California, San Diego (UCSD), School of Medicine. Dr. Stephen In-Sun Ryu, MD, FACS, MS is affiliated with Dignity Health, Sutter Health and Sequoia Hospital.

Office Locations

300 Pasteur Drive
Palo Alto, CA 94305

open_in_new

Sequoia Hospital

795 El Camino Real Department Neurosurgery
Palo Alto, CA 94301

(650) 853-2919

(650) 330-4316

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Some issues Dr. Stephen In-Sun Ryu, MD, FACS, MS can help you with:

Craniotomy

Craniotomy and craniectomy are surgical procedures used to access the brain and treat tumors, intracranial pressure, or other conditions. These surgeries are performed by creating holes in the skull, or cranium, to expose the brain. The opening in the skull can be immediately replaced (craniotomy), or it can be replaced during a later procedure (craniectomy). The following procedures use craniotomy or craniectomy:

Brain biopsy, which is done by guiding a needle through the opening in the skull to the targeted area of the brain. This procedure may be performed through an open or minimally invasive approach. The minimally invasive approach, called stereotactic brain biopsy, uses a computer to guide the needle.
Brain tumor resection, which may be performed following a biopsy with image guidance. Depending on the size and location of the tumor, resection will require 2-5 hours.
Cerebrospinal fluid (CSF) leak repair, particularly for leaks that continue for a long period of time after a surgery. CSF leaks that are left untreated can lead to complications such as meningitis, an inflammation of the outer layers (meninges) of the brain.
Decompression, often following a stroke or injury. Decompressive craniotomy or craniectomy temporarily removes a flap from the skull to give the brain more room for swelling, which provides pressure relief.
Hematoma evacuation, which can also relieve pressure on the brain. A hematoma is a swelling of clotted blood. It can occur between the skull and the outer covering of the brain, or dura (epidural), between the dura and the brain (subdural), and within the brain (intracerebral). Craniotomy or craniectomy may be used to access and remove the hematoma.

To perform a craniotomy, the surgeon will need to make an incision on the scalp to expose the skull. Some of the hair may be shaved, and the scalp will be cleaned with antiseptic solution. Following the incision, the surgeon will use a drill to remove a piece of the skull, called a bone or skull flap. If the surgeon needs to reach a tumor or perform an aspiration, the dura, which covers the brain, will be incised (cut) to access the lesion. The bone flap will be reattached once the surgeon has completed the procedure. If the surgeon is performing a craniectomy, the same steps will be followed, but a mesh piece will be placed where the bone flap was, and the scalp will be surgically closed. Patients will need to wear a special helmet for a few months after the procedure. The bone flap will be preserved and replaced during a later operation, or it may never be replaced.

Patient recovery period can range from two days to two weeks, depending on the specific procedure and condition. Patient will require monitoring and may be given medication for pain or brain swelling. Patients will have to restrict their physical activity for some time after the procedure, and they may need to work with a physical therapist.

Hydrocephalus

Normally, the brain is bathed in a liquid called cerebrospinal fluid. This fluid cushions and nurtures the brain cells as it flows around and through the brain. Sometimes, cerebrospinal fluid does not get reabsorbed into the body properly, or a blockage in the brain can stop it from flowing. This causes a buildup of pressure called hydrocephalus. This condition affects a wide range of people, but it is much more prevalent among infants and older adults. Left untreated, hydrocephalus can cause uncomfortable symptoms, such as headaches and blurred vision, and eventually may cause brain damage.

Hydrocephalus is most often treated with an implanted device called a shunt. A shunt is a long, thin tube that is used to drain excess fluid. One end is placed within the brain. The tube runs under the skin, along the neck behind the ear, and to another part of the body where the fluid can be reabsorbed. Most often this is the abdomen, but the chest or other areas can also be used. Shunts have a valve that allows doctors to monitor and control the pressure within the brain. Insertion of a shunt is a surgical procedure that takes one to two hours. Incisions are made in the head and the abdomen, and the shunt is threaded into place before the openings are stitched closed.

In cases where hydrocephalus is caused by a blockage, a procedure called endoscopic third ventriculostomy, or ETV, may be performed. During this procedure, a surgeon makes a dime-sized hole in the skull and uses a thin tube with a camera on the end (called an endoscope) to see inside the brain. The surgeon punctures a hole in the floor of the third ventricle, a fluid-filled space within the brain. The hole provides an opening for cerebrospinal fluid to flow around the blockage, normalizing pressure. The entire procedure usually takes less than an hour and patients can often go home the following day. ETV can provide a permanent and safe alternative to a shunt, but it is only useful for patients whose hydrocephalus is caused by a blockage.

Spinal Cord Injury

Spinal cord injury medicine is a branch of medicine that treats damage to the spinal cord from an injury or a nontraumatic myelopathy, which is any disorder that affects the spinal area. The spinal cord is a section of nerve tissue protected by the vertebrae (spinal bones). Trauma to the spinal cord, typically caused by compression or bent vertebrae, prevents the body and brain from communicating. This can result in pain, loss of sensation, and impaired physical function and movement. Acute spinal cord injuries (SCIs) are a leading cause of permanent disability. Spinal cord injuries may develop from accidents or myelopathies, disorders that provoke spinal compression. Traumatic incidents such as falls, sports injuries, vehicle accidents, and bullet or stab wounds can cause an acute spinal cord injury.

Spinal cord injury medicine seeks to stabilize the spine and to alleviate the symptoms of spine damage. Practitioners of spinal cord injury medicine are called spinal cord injury specialists. Spinal cord injury medicine is an interdisciplinary field, meaning physicians of various specialties may be trained to treat spinal cord injuries.

Damage to the spinal cord may initially be diagnosed through X-ray, MRI, or CT scans. Patients can also undergo spinal exams to evaluate their sensory ability and strength. Injuries to the spinal cord can be complete (no feeling or sensation) or incomplete (some feeling or sensation remains). Conditions spinal cord injury medicine specialists may treat include:

Paralysis, such as paraplegia (loss of function in the legs), or quadriplegia (loss of function from the neck down)
Spine fracture or trauma, which can lead to impairment and/or significant pain
Spinal infections
Myelopathies, such as herniated disks, spinal tumors, and rheumatoid arthritis
Inflammatory diseases such as ankylosing spondylosis, and degenerative conditions like Lou Gehrig's disease (ALS)

Treatment for spinal cord injuries often involves surgery, either directly after an injury occurs or at a later date. Surgery for spine injuries is intended to ease spinal compression and stabilize the spine. Surgical procedures can involve shifting vertebrae, removing bone, or altering spinal placement with implantable devices. Patients with significant spinal trauma may require urgent surgical intervention.

Surgical treatments can be complemented by rehabilitative physical therapy to improve mobility. Spinal cord injury specialists also treat complications arising from a spinal injury, such as respiratory or bladder conditions. Some patients with spinal cord injuries may require lifelong treatment. Spinal cord injury specialists aim to help these patients successfully adjust and lead an improved quality of life. An emerging treatment for spinal cord injuries is neural prosthetics, which replicate patients' lost nerve function. Neural prostheses may be used as artificial body parts or assistive devices that patients may cognitively control. Other assistive devices include wheelchairs and scooters.

Spinal cord injury specialists may collaborate with physical therapists, radiologists, neurologists, urologists, and orthopedists.

In The News

“"It became very clear that we really needed to offer some additional services," said Dr. Stephen Ryu, a Palo Alto Medical Foundation neurosurgeon who is co-directing the San Carlos Center's clinic...”—"Coronavirus car clinics: Drive-through health care in the Bay Area", Mercury News, April 2020

“Two assisting surgeons, Dr. Bernard Coert and Dr. Stephen Ryu, shaved a small rectangle just above Mrs. Young's...”—"Out of Nowhere, a Devastating Tangle in the Brain", The Gadsden Times, March 2005

“Two assisting surgeons, Dr. Bernard Coert and Dr. Stephen Ryu, used ultrasound to find the scalp artery and marked its path on her scalp.”—"Rare treatment of rare disorder (Published 2005)", New York Times, March 2005

Noteworthy Medicare Patient Procedures Performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2023

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

Top 10%

By Volume:

discectomy

In 2023, Dr. Stephen In-Sun Ryu, MD, FACS, MS performed more discectomy (disc removal surgery) procedures for Medicare patients than 90% of providers in related specialties within California.

Top 25%

By Volume:

lumbar hemilaminectomy

lumbar laminotomy

posterior lumbar discectomy

spinal decompression surgery

spinal procedures

In 2012, Dr. Stephen In-Sun Ryu, MD, FACS, MS performed more lumbar hemilaminectomy, lumbar laminotomy, posterior lumbar discectomy, spinal decompression surgery, and spinal procedures procedures for Medicare patients than 75% of providers in related specialties within California.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2012 were spinal procedures, nerve procedures, decompression surgery and minimally invasive procedures.

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

arthrodesis (bone fusion surgery)	13
decompression surgery	27
doctor visit	378
minimally invasive procedures	13
nerve procedures	27
spinal procedures	64

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2013 were spinal procedures, nerve procedures, decompression surgery and minimally invasive procedures.

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

arthrodesis (bone fusion surgery)	14
decompression surgery	17
doctor visit	400
minimally invasive procedures	14
nerve procedures	17
spinal procedures	31

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	136
Female	146

**Ethnicity**
Non-Hispanic White	214
Black	0
Hispanic	0
Asian	47
Other	0
Native American	0

**Age**
From 65 to 74	124
From 75 to 84	100
85 and over	29
Less than 65	29

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2013

Hypertension	57
High Cholesterol	49
Stroke	4
Ischemic Heart Disease	23
Depression	22
Chronic Kidney Disease	21
Asthma	10
Osteoperosis	11
Atrial Fibrilation	9
Heart Failure	9
Chronic Obstructive Pulmonary Disease	8
Diabetes	25
Dementia	4
Cancer	11

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2014 were spinal procedures, nerve procedures and decompression surgery.

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

decompression surgery	30
doctor visit	481
nerve procedures	30
spinal procedures	41

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	145
Female	164

**Ethnicity**
Non-Hispanic White	238
Black	0
Hispanic	16
Asian	43
Other	0
Native American	0

**Age**
From 65 to 74	144
From 75 to 84	108
85 and over	29
Less than 65	28

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2014

Hypertension	55
High Cholesterol	52
Stroke	6
Ischemic Heart Disease	24
Depression	22
Chronic Kidney Disease	19
Asthma	8
Osteoperosis	11
Atrial Fibrilation	9
Heart Failure	8
Chronic Obstructive Pulmonary Disease	6
Diabetes	25
Dementia	5
Cancer	11

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2015 were spinal procedures, nerve procedures, decompression surgery and arthrodesis (bone fusion surgery).

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

arthrodesis (bone fusion surgery)	28
decompression surgery	38
doctor visit	497
minimally invasive procedures	13
neck surgery	15
nerve procedures	38
spinal procedures	93

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	326
Female	352

**Ethnicity**
Non-Hispanic White	510
Black	0
Hispanic	30
Asian	108
Other	0
Native American	0

**Age**
From 65 to 74	320
From 75 to 84	242
85 and over	52
Less than 65	64

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2015

Hypertension	55
High Cholesterol	50
Stroke	8
Ischemic Heart Disease	22
Depression	22
Chronic Kidney Disease	22
Asthma	9
Osteoperosis	12
Atrial Fibrilation	9
Heart Failure	9
Chronic Obstructive Pulmonary Disease	5
Diabetes	20
Dementia	5
Cancer	11

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2016 were spinal procedures, nerve procedures and decompression surgery.

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

decompression surgery	19
doctor visit	512
nerve procedures	19
spinal procedures	45

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	157
Female	202

**Ethnicity**
Non-Hispanic White	254
Black	0
Hispanic	21
Asian	59
Other	0
Native American	0

**Age**
From 65 to 74	171
From 75 to 84	124
85 and over	35
Less than 65	29

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2016

Hypertension	60
High Cholesterol	50
Stroke	3
Ischemic Heart Disease	23
Depression	25
Chronic Kidney Disease	23
Asthma	11
Osteoperosis	9
Atrial Fibrilation	8
Heart Failure	9
Chronic Obstructive Pulmonary Disease	6
Diabetes	19
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2017 were spinal procedures, nerve procedures, decompression surgery and arthrodesis (bone fusion surgery).

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

arthrodesis (bone fusion surgery)	25
decompression surgery	35
doctor visit	552
minimally invasive procedures	11
neck surgery	14
nerve procedures	35
spinal procedures	97

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	173
Female	232

**Ethnicity**
Non-Hispanic White	288
Black	0
Hispanic	25
Asian	65
Other	0
Native American	0

**Age**
From 65 to 74	178
From 75 to 84	159
85 and over	44
Less than 65	24

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2017

Hypertension	61
High Cholesterol	51
Stroke	5
Ischemic Heart Disease	24
Depression	28
Chronic Kidney Disease	24
Asthma	8
Osteoperosis	11
Atrial Fibrilation	10
Heart Failure	12
Chronic Obstructive Pulmonary Disease	8
Diabetes	25
Dementia	9
Cancer	11

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2018 were spinal procedures, nerve procedures and decompression surgery.

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

decompression surgery	38
doctor visit	571
nerve procedures	38
spinal procedures	54

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	188
Female	212

**Ethnicity**
Non-Hispanic White	291
Black	0
Hispanic	24
Asian	55
Other	0
Native American	0

**Age**
From 65 to 74	194
From 75 to 84	142
85 and over	40
Less than 65	24

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2018

Hypertension	57
High Cholesterol	56
Stroke	5
Ischemic Heart Disease	24
Depression	21
Chronic Kidney Disease	23
Asthma	10
Osteoperosis	10
Atrial Fibrilation	11
Heart Failure	7
Chronic Obstructive Pulmonary Disease	6
Diabetes	19
Dementia	7
Cancer	11

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2019 were spinal procedures, nerve procedures, decompression surgery and minimally invasive procedures.

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

arthrodesis (bone fusion surgery)	13
decompression surgery	42
doctor visit	563
minimally invasive procedures	13
nerve procedures	42
spinal procedures	87

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	194
Female	206

**Ethnicity**
Non-Hispanic White	312
Black	0
Hispanic	0
Asian	51
Other	18
Native American	0

**Age**
From 65 to 74	183
From 75 to 84	154
85 and over	49
Less than 65	14

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2019

Hypertension	62
High Cholesterol	62
Stroke	5
Ischemic Heart Disease	31
Depression	23
Chronic Kidney Disease	25
Asthma	10
Osteoperosis	12
Atrial Fibrilation	11
Heart Failure	12
Chronic Obstructive Pulmonary Disease	7
Diabetes	20
Dementia	10
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2020 were spinal procedures, nerve procedures and decompression surgery.

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

decompression surgery	33
doctor visit	412
nerve procedures	33
spinal procedures	46

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	153
Female	173

**Ethnicity**
Non-Hispanic White	253
Black	0
Hispanic	0
Asian	35
Other	19
Native American	0

**Age**
From 65 to 74	143
From 75 to 84	131
85 and over	39
Less than 65	13

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2020

Hypertension	54
High Cholesterol	59
Stroke	3
Ischemic Heart Disease	28
Depression	24
Chronic Kidney Disease	22
Asthma	12
Osteoperosis	13
Atrial Fibrilation	9
Heart Failure	10
Chronic Obstructive Pulmonary Disease	8
Diabetes	20
Dementia	8
Cancer	9

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2021 were spinal procedures, nerve procedures, decompression surgery and minimally invasive procedures.

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

arthrodesis (bone fusion surgery)	11
decompression surgery	47
doctor visit	592
minimally invasive procedures	11
nerve procedures	47
spinal procedures	84

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	193
Female	203

**Ethnicity**
Non-Hispanic White	297
Black	0
Hispanic	0
Asian	50
Other	25
Native American	0

**Age**
From 65 to 74	182
From 75 to 84	158
85 and over	41
Less than 65	15

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2021

Hypertension	58
High Cholesterol	60
Stroke	3
Ischemic Heart Disease	26
Depression	19
Chronic Kidney Disease	20
Asthma	6
Osteoperosis	15
Atrial Fibrilation	8
Heart Failure	7
Chronic Obstructive Pulmonary Disease	6
Diabetes	24
Dementia	6
Cancer	14

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA during 2022 were spinal procedures, nerve procedures, decompression surgery and arthrodesis (bone fusion surgery).

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

arthrodesis (bone fusion surgery)	12
decompression surgery	39
doctor visit	616
nerve procedures	39
spinal procedures	87

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Male	199
Female	214

**Ethnicity**
Non-Hispanic White	302
Black	0
Hispanic	0
Asian	52
Other	34
Native American	0

**Age**
From 65 to 74	181
From 75 to 84	173
85 and over	39
Less than 65	20

Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS in 2022

Hypertension	71
High Cholesterol	75
Stroke	9
Ischemic Heart Disease	22
Depression	20
Chronic Kidney Disease	17
Asthma	12
Osteoperosis	21
Atrial Fibrilation	12
Heart Failure	9
Chronic Obstructive Pulmonary Disease	6
Diabetes	23
Dementia	4
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Stephen In-Sun Ryu, MD, FACS, MS for Medicare patients.

The highest averages for the top procedures that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated as a spine surgeon in Palo Alto, CA were spinal procedures, nerve procedures, decompression surgery and arthrodesis (bone fusion surgery).

arthrodesis (bone fusion surgery)	16
decompression surgery	33
doctor visit	506
minimally invasive procedures	12
neck surgery	14
nerve procedures	33
spinal procedures	66

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

**Gender**
Female	191
Male	169

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	51
Non-Hispanic White	269
Hispanic	10
Native American / Alaskan Native	0
Other	8

**Age**
85 and over	36
75 to 84	135
Less than 65	23
65 to 74	165

Average of Total of Conditions of Medicare patients treated by Dr. Stephen In-Sun Ryu, MD, FACS, MS From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Stephen In-Sun Ryu, MD, FACS, MS treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	53
High Cholesterol	51
Stroke	4
Ischemic Heart Disease	22
Depression	20
Chronic Kidney Disease	19
Asthma	8
Osteoporosis	11
Heart Failure	8
Chronic Obstructive Pulmonary Disease	6
Diabetes	20
Atrial Fibrillation	8
Dementia	6
Cancer	10

Education & Training

Dr. Stephen In-Sun Ryu, MD, FACS, MS graduated from University of California, San Diego (UCSD), School of Medicine. He completed residency at Stanford University Medical Center. He is certified by the Neurosurgery - Board Certified and has a state license in California.

Medical School: University of California, San Diego (UCSD), School of Medicine

Residency: Stanford University Medical Center

Board Certification: Neurosurgery - Board Certified

Licensed In: California

Affiliations & Hospitals

Dr. Stephen In-Sun Ryu, MD, FACS, MS is associated with these hospitals and organizations:

Dignity Health

Sutter Health

Sequoia Hospital

Insurance Information

Please note: Insurance information may change at any time, and the provider may accept your insurance plan even if it is not listed below. Please contact the provider's office to confirm that your insurance is accepted.

Dr. Stephen In-Sun Ryu, MD, FACS, MS appears to accept the following insurance providers: Blue Shield of California, Medicare Advantage, HealthSmart, MultiPlan, United Healthcare, TRICARE, Cigna, Alliance PPO, Anthem Blue Cross of California, Private Healthcare Systems (PHCS), Accepted Valley Health Plan Plans: Classic Commercial HMO Plan only, Accepted Central California Alliance for Health Plans: TotalCare (HMO D-SNP), Accepted SCAN Plans: SCAN Compass (HMO), Accepted Santa Clara Family Health Plan Plans: DualConnect (HMO D-SNP), Accepted Provider Networks of America Plans: PPO, Accepted Sutter Health Plan Plans: Individual and Family Plan HMO: Large and Small Group HMO, Accepted Chinese Community Health Plan Plans: Active Choice- PPO Silver: Amber 50 HMO Silver: American Indian/Alaskan Native (Covered CA for Individual & Families): Bronze 60 HDHP HMO (including... and Accepted Aetna Plans: Aetna Choice POS II: Aetna Select EPO: Aetna Select Open Access: Aetna Signature Administrators (ASA): Aetna Student Health Program: Health Fund HMO (aka HMO/HRA): Health Fund....

Insurance Accepted by Provider includes:

According to our sources, Dr. Stephen In-Sun Ryu, MD, FACS, MS accepts the following insurance providers:

Blue Shield of California

Medicare Advantage

HealthSmart

MultiPlan

United Healthcare

TRICARE

Cigna

Alliance PPO

Anthem Blue Cross of California

Private Healthcare Systems (PHCS)

Accepted Valley Health Plan Plans: Classic Commercial HMO Plan only

Accepted Central California Alliance for Health Plans: TotalCare (HMO D-SNP)

Accepted SCAN Plans: SCAN Compass (HMO)

Accepted Santa Clara Family Health Plan Plans: DualConnect (HMO D-SNP)

Accepted Provider Networks of America Plans: PPO

Accepted Sutter Health Plan Plans: Individual and Family Plan HMO: Large and Small Group HMO

Accepted Chinese Community Health Plan Plans: Active Choice- PPO Silver: Amber 50 HMO Silver: American Indian/Alaskan Native (Covered CA for Individual & Families): Bronze 60 HDHP HMO (including...

Accepted Aetna Plans: Aetna Choice POS II: Aetna Select EPO: Aetna Select Open Access: Aetna Signature Administrators (ASA): Aetna Student Health Program: Health Fund HMO (aka HMO/HRA): Health Fund...

Ratings & Reviews

Dr. Stephen In-Sun Ryu, MD, FACS, MS has an exceptional overall rating with an average of 4.89 out of 5 stars based on 341 ratings. We collect ratings and reviews of Dr. Stephen In-Sun Ryu, MD, FACS, MS from all over the web to help you find the right in Palo Alto, CA.

4.89

Overall Rating

(341 Ratings)

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General Payments

These charts describe general payments received by Dr. Stephen In-Sun Ryu, MD, FACS, MS. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
NUVASIVE, INC.	$617,729 Pulse $237,421	ALIF $152,823	LessRay $130,732	XLIF $26,109	Simplify Cervical Artificial Disc $9,701	Other $60,942
Stryker Corporation	$296,115 Airo $47,617	ES2 $40,427	SERRATO $37,272	OASYS $33,566	Tritanium $24,330	Other $112,904
Zimmer Biomet Holdings, Inc.	$203,149 Mobi-C $132,066	Mobi C $24,496	ROI C $15,357	Mobi $10,650	Maxan Cervical System $5,927	Other $14,653
ZIMVIE INC.	$36,523 Mobi-C $36,511	Spine-None $12
Medtronic USA, Inc.	$32,021 MIDAS REX $30,947	O-ARM-ST $685	CD HORIZON $224	MazorX - Renaissance $109	KYPHON Balloon Kyphoplasty $38	Other $18
Other	$104,847 SYNAPSE $51,967	iFuse Implant $20,190	Spinal Implant $13,064	ExcelsiusGPS Robotic Navigation System $2,067	Blazer Vertebral Augmentation Kit $1,423	Other $16,137

**Types of Payments**
Consulting Fee	$753,096
Royalty or License	$318,496
Travel and Lodging	$160,370
Food and Beverage	$36,579
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$13,260
Other	$8,584

Research Payments

Dr. Stephen In-Sun Ryu, MD, FACS, MS has received 4 research payments totaling $1,800.

Ownership and Interest Payments

This table describes ownership payments received by Dr. Stephen In-Sun Ryu, MD, FACS, MS.

Aegis Spine, Inc.	2021	$109,956.00	Physician Covered Recipient	There has been no update in stock valuation since 2020.
Aegis Spine, Inc.	2020	$109,956.00	Physician Covered Recipient	Share value
DuraStat LLC	2022	$100,000.00	Physician Covered Recipient	None
Aegis Spine, Inc.	2015	$0.00	Immediate family member	shareholder of 60,000 stocks

Biography

Dr. Stephen Ryu is a medical specialist in spine surgery and neurosurgery. His average rating from his patients is 5.0 stars (out of 5). His areas of expertise include computer assisted surgery (CAS), pituitary surgery, and airway stenosis. Dr. Ryu's hospital/clinic affiliations include Sequoia Hospital and Sutter Health. Anthem, Blue California, and HealthSmart seem to be the insurance carriers that Dr. Ryu accepts. Dignity Health reports that he is accepting new patients at his office in Palo Alto, CA. Dr. Ryu obtained his medical school training at the University of California, San Diego (UCSD), School of Medicine and performed his residency at Stanford University Medical Center. He speaks Korean.