MR
16 Years of Experience
Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Ryou, Gastroenterologist in Boston, MA?
Dr. Marvin Ryou, MD is a Gastroenterologist, who primarily practices in Boston, MA. He has been practicing for over 16 years and is board certified by the American Board of Internal Medicine. Dr. Ryou graduated from Harvard Medical School, Boston, Massachusetts and completed his residency at Brigham & Women'S Hosp, Internal Medicine. Dr. Ryou is fluent in English, and is currently seeing new patients. Dr. Ryou’s practice accepts Cigna, Medicaid, Medicare, UnitedHealthcare, Aetna and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Ryou’s office at (617) 732-5500.
What are Areas of Expertise for Dr. Ryou?
Dr. Marvin Ryou, MD is a highly-rated, board-certified Gastroenterologist known for expertly diagnosing, treating, and managing a wide array of related conditions or procedures. Utilizing the latest medical advancements and evidence-based practices, Dr. Ryou empowers patients to confidently navigate their health journey, specializing in Bariatric Endoscopy , Endoscopic Hepatology, Endoscopic Ultrasound, Obesity, or comprehensive wellness support. Serving the Boston/MA community, Dr. Ryou is dedicated to enhancing lives through expert, patient-centered care.
Where did Dr. Ryou go to medical school and complete their residency?
Residency: Brigham & Women'S Hosp, Internal Medicine
Medical School: Harvard Medical School, Boston, Massachusetts | Harvard Medical School, Boston, Massachusetts
Is Dr. Ryou board certified in Gastroenterologist?
Yes, Dr. Marvin Ryou, MD is board certified by the American Board of Internal Medicine
What languages does Dr. Ryou speak?
Dr. Ryou and their clinical team can communicate with patients in the following languages:
English
What conditions does Dr. Ryou treat?
As a Gastroenterologist, Dr. Ryou diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Ryou. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly.
Also known as:
- Difficulty Swallowing
- Swallowing Disorder
- Dysphagia
- Trouble swallowing
- Painful swallowing
ICD-10 Codes:
- R1310: Dysphagia, unspecified
Also known as:
- Stomach and Duodenum Disorder
- Narrowing of Stomach Outlet in Adults
- Stomach Disorder
- Gastric Conditions
- Duodenal Conditions
- Digestive System Disorders
- Adult Pyloric Stenosis
- Thickened Pylorus in Adults
- Stomach Exit Narrowing
ICD-10 Codes:
- K3189: Other diseases of stomach and duodenum
- K311: Adult hypertrophic pyloric stenosis
Also known as:
- Pancreatic Cyst
- Other Specific Pancreatic Disease
- Pancreatic Disease
- Cyst on Pancreas
- Pancreatic Pseudocyst
- Fluid Sac on Pancreas
- Miscellaneous Pancreas Disorders
- Named Pancreatic Conditions
- Other Defined Pancreas Problems
ICD-10 Codes:
- K862: Cyst of pancreas
- K8689: Other specified diseases of pancreas
Also known as:
- Gastrointestinal Device Fitting and Adjustment
- GI Appliance Fitting
- Digestive Device Adjustment
- Enteral Device Care
ICD-10 Codes:
- Z4659: Encounter for fitting and adjustment of other gastrointestinal appliance and device
Also known as:
- Abnormal Digestive Tract Imaging
- Abnormal Abdominal Imaging
- Abnormal GI scan
- Unusual digestive imaging
- Digestive system imaging findings
- Abnormal belly scan
- Unusual abdominal imaging
- Abdominal scan findings
ICD-10 Codes:
- R933: Abnormal findings on diagnostic imaging of other parts of digestive tract
- R935: Abnormal findings on diagnostic imaging of other abdominal regions, including retroperitoneum
Also known as:
- Abdominal Pain
- Upper Middle Abdominal Pain
- Stomach Ache
- Belly Pain
- Stomach Pain
- Epigastric pain
- Pain below breastbone
- Upper stomach pain
ICD-10 Codes:
- R109: Unspecified abdominal pain
- R1013: Epigastric pain
Also known as:
- Follow-up After Treatment (Non-Cancer)
- Post-Treatment Check-up
- Aftercare Visit
- Recovery Monitoring Exam
ICD-10 Codes:
- Z09: Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm
Also known as:
- Blocked Esophagus
- Esophagus Disorder
- Esophageal Obstruction
- Food Pipe Blockage
- Swallowing Difficulty
ICD-10 Codes:
- K222: Esophageal obstruction
Also known as:
- After Surgery
- Digestive Disease
- Postoperative Digestive Disorders
- Other GI Complications Post-Op
- Problems After Digestive Procedure
ICD-10 Codes:
- K9189: Other postprocedural complications and disorders of digestive system
Also known as:
- Colon Cancer Screening
- Health Screening
- Colorectal Cancer Screening (PDQ®)
- Screening Tests to Detect Colorectal Cancer and Polyps
- Tests to Detect Colorectal Cancer and Polyps
- Colorectal Cancer Screening
- Colonoscopy Screening
- Bowel Cancer Screening
ICD-10 Codes:
- Z1211: Encounter for screening for malignant neoplasm of colon
Also known as:
- Other Pre-Procedure Examination
- Various pre-op checks
- Miscellaneous pre-surgery exams
- Other pre-treatment assessments
ICD-10 Codes:
- Z01818: Encounter for other preprocedural examination
Also known as:
- Blocked Bile Duct
- Bile Duct Disease
- Biliary Obstruction
- Bile Duct Blockage
- Obstructed Bile Duct
ICD-10 Codes:
- K831: Obstruction of bile duct
Also known as:
- Gastrojejunal Ulcer
- Peptic Ulcer
- Ulcer after stomach surgery
- Anastomotic ulcer
- Marginal ulcer
ICD-10 Codes:
- K289: Gastrojejunal ulcer, unspecified as acute or chronic, without hemorrhage or perforation
Also known as:
- Acid Reflux
- GERD
- Acid Reflux (GER & GERD) in Adults
- Acid Reflux (GER & GERD) in Children
- Acid Reflux (GER & GERD) in Infants
- Gastroesophageal Reflux
- Heartburn
- Indigestion
ICD-10 Codes:
- K219: Gastro-esophageal reflux disease without esophagitis
Also known as:
- Nausea and Vomiting
- Feeling Sick and Throwing Up
- Stomach Flu Symptoms
- Queasy and Vomiting
ICD-10 Codes:
- R112: Nausea with vomiting, unspecified
Which procedures does Dr. Ryou perform as a Gastroenterologist?
As a Gastroenterologist, procedures performed by a Dr. Marvin Ryou may include:
- Colonoscopy
- Colonoscopy Consultation
- Colorectal Cancer Screening
- Endoscopic Ultrasound
- Endoscopy / Endoscopic Ultrasound
- Gastric Balloon
- Gastric Stimulator Implantation Consultation
- Gastric Stimulator Implantation Follow Up
For detailed information, please contact Dr. Ryou's office.
Does Dr. Ryou accept my insurance?
Dr. Ryou accepts most major insurance plans. Important: Please call our office at (617) 732-5500 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Ryou accept in Boston, MA?
Dr. Ryou in Boston, MA accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
BCBS Unspecified
Blue Cross Blue Shield of Massachusetts
CVS Health (formerly Aetna)
Express Scripts
Federal Employee Program
Medicaid
Medicare
Network Health
Point32Health
UnitedHealthcare
View All Insurances
Where is Dr. Ryou's office located?
Recognitions
Castle Connolly Doctor’s Choice Awards
Doctor’s Choice - 2025
Among the most nominated for the Castle Connolly Top Doctor recognition in 2025
What is Dr. Ryou's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Ryou's National Provider Identifier (NPI) number is 1821104787.
What common questions do patients ask about Dr. Ryou?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Ryou
What is Dr. Marvin Ryou's specialty?
Dr. Ryou is a Gastroenterologist near Boston, MA. An internist focused on diagnosing and treating disorders of the digestive system, encompassing the stomach, intestines, liver, and gallbladder. This specialist manages conditions like abdominal pain, ulcers, diarrhea, cancer, and jaundice, and performs intricate diagnostic and therapeutic procedures using endoscopes to examine internal organs. Contact Dr. Ryou to book an appointment today.
Is this Dr. Marvin Ryou affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Ryou is affiliated with Brigham and Women's Hospital which is a Castle Connolly Top Hospital. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
Where can I learn more about Gastroenterologist?
Explore Gastroenterologist with insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is Marvin Ryou accepting new patients in Boston, MA?
Yes, Dr. Marvin Ryou is accepting new patients at this time.
Does Dr. Marvin Ryou offer online booking?
Please contact Dr. Ryou's office at (617) 732-5500 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with Marvin Ryou?
Please contact Dr. Ryou's office at (617) 732-5500 for information regarding telehealth appointment availability or for scheduling assistance.
Which board certifications does Dr. Marvin Ryou have?
Dr. Marvin Ryou is certified by the American Board of Internal Medicine.
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