Summary

Dr. Wei-Fang Ko is a gastroenterologist who specializes in diagnosing and treating disorders of the digestive system. He earned his medical degree from Taipei Medical University and has been practicing medicine for four decades. Dr. Ko is fluent in English and Spanish.

Dr. Ko practices at Saint Rose Hospital and Sutter Eden Medical Center, both located in Castro Valley, California. He focuses on treating common digestive concerns such as colon polyps, hemorrhoids, and abdominal pain. His expertise includes performing colonoscopies, lower GI endoscopies, and upper GI endoscopies to help diagnose and monitor digestive health. Patients rate him 4.2 out of 5 stars on Vitals.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4.2
  • 40 years of experience
  • 51 insurance plans accepted
  • speaks English, Spanish
  • University Of Minnesota Medical School
  • 18 written reviews
  • 1 specialty
  • 10 areas of expertise
  • 1 hospital affiliation
  • 2 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. Wei-Fang Ko has 2 locations

Gastroenterology Medical Specialist

19845 Lake Chabot Rd Ste 104Castro Valley, CA 94546
Mon9:00 am - 5:00 pm
Tue9:00 am - 5:00 pm
Wed9:00 am - 5:00 pm
Thu9:00 am - 5:00 pm
Fri9:00 am - 5:00 pm
SatClosed
SunClosed

Sutter Eden Medical Center

20103 Lake Chabot RdCastro Valley, CA 94546

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Dr. Wei-Fang Ko, MD
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Dr. Wei-Fang Ko, MDDr. Samer EldikaDr. Sidhartha SinhaDr. Damanpreet Grewal
GastroenterologyGastroenterologyGastroenterologyGastroenterology
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
4.2 
40 Years of Experience 29 Years of Experience 19 Years of Experience 17 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks Arabic, English, Spanish Speaks English Speaks English
Castro Valley , CAStanford , CAPalo Alto , CAPalo Alto , CA
Med School: University Of Minnesota Medical School Med School: American University Of Beirut Faculty Of Medicine Med School: University Of California San Francisco School Of Medicine Med School: St Georges University School Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. Wei-Fang Ko

  • Accepts Medicaid
  • Aetna
  • Aetna - HMO
  • Aetna - Medicare
  • Affinity Health Plan
  • Affinity Health Plan - Medicare (Advantage HMO)
  • Alameda Alliance for Health
  • Alignment Health Plan
  • Alignment Health Plan - HMO
  • AltaMed Senior BuenaCare (PACE)
  • Anthem Blue Cross
  • Blue Cross Blue Shield of Oklahoma
  • Blue Cross Blue Shield of Tennessee
  • BLUE CROSS of CALIFORNIA
  • BLUE CROSS of CALIFORNIA - HMO
  • BLUE CROSS of CALIFORNIA - Medicare (Advantage HMO)
  • Blue Shield of California
  • Blue Shield of California - HMO
  • Brand New Day
  • CareFirst Blue Cross Blue Shield
  • CareFirst Blue Cross Blue Shield - HMO
  • Central California Alliance for Health
  • Cigna
  • GEHA
  • Golden State Medicare Health Plan
  • Golden State Medicare Health Plan - Medicare
  • Health Net - HMO
  • Health Plan of San Mateo
  • Humana
  • Imperial Health Plan of California
  • Kaiser Permanente
  • Kaiser Permanente - HMO
  • Medica
  • Medicare
  • Medicare - Medicaid
  • Medicare - Medicare
  • Medicare - Medicare (Advantage HMO)
  • Meritain Health
  • Molina Healthcare
  • Optimum HealthCare
  • Optimum HealthCare - Medicare (Advantage HMO)
  • Priority Health
  • Santa Clara Family Health Plan
  • SCAN Health Plan
  • SCAN Health Plan - HMO
  • Sutter Health Plus
  • Tricare
  • UnitedHealthcare
  • UnitedHealthcare - HMO
  • UnitedHealthcare - Medicare
  • UnitedHealthcare Community Plan
  • UnitedHealthcare Oxford

Medical Specialties

Dr. Wei-Fang Ko has the following specialty

Specialty Expertise

Dr. Wei-Fang Ko has the following 10 areas of expertise

  • Abdominal Pain
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Acid Reflux Disease (GERD)
  • Celiac Disease
  • Colonoscopy
  • Constipation
  • Hemorrhoids
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Certifications, License, & Education

40 Years Experience

Dr. Wei-Fang Ko holds an expired medical license in the state of California.

Medical License

Medical Doctor with an expired medical license in the state of California that expired in 2026.

Education & Training

Medical School

Graduated from University Of Minnesota Medical School and Taipei Medical University in 1986.

NPI Number

Dr. Ko's NPI number is 1417068081.

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Frequently Asked Questions

How can I make an appointment with Dr. Wei-Fang Ko?
You can find contact information for Dr. Wei-Fang Ko here on Vitals.
Is Dr. Wei-Fang Ko accepting new patients?
Dr. Wei-Fang Ko is accepting new patients on Vitals. View Dr. Wei-Fang Ko's profile on Vitals to make an appointment.
Does Dr. Wei-Fang Ko accept my insurance?
You can see the insurance plans that Dr. Wei-Fang Ko accepts on their Vitals profile.
What languages does Dr. Wei-Fang Ko speak?
Dr. Wei-Fang Ko speaks English and Spanish.
Which hospitals is Dr. Wei-Fang Ko affiliated with?
Dr. Wei-Fang Ko is affiliated with Saint Rose Hospital.

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