Summary

Dr. Jeffrey Mark is a gastroenterologist with 34 years of experience treating digestive health conditions. He earned his medical degree from the University of Illinois at Chicago College of Medicine and completed his residency at the University of Texas Health System. His extensive background in gastroenterology allows him to address a wide range of digestive system concerns with expertise developed over more than three decades of practice. Dr. Mark speaks both Chinese and Spanish, enabling him to communicate effectively with diverse patient populations.

Dr. Mark practices at multiple locations throughout Northern California, including San Ramon, Turlock, and Modesto. He is affiliated with Doctors Medical Center of Modesto, San Ramon Regional Medical Center, and Emanuel Medical Center. His clinical focus includes treating conditions such as hemorrhoids and colon polyps. Dr. Mark performs essential procedures including colonoscopy and laparoscopy to diagnose and treat digestive health issues. Patients have given him an average rating of 4.3 out of 5 on Vitals, reflecting their satisfaction with his care.
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Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4.3
  • 34 years of experience
  • speaks Chinese, Spanish
  • University Of Texas Health System
  • 35 written reviews
  • 1 specialty
  • 14 areas of expertise
  • 1 board certification
  • 3 hospital affiliations
  • 5 office locations
  • Male

Patients’ Perspective

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

Office Locations

Dr. Jeffrey C G Mark has 5 locations

All Functional Health San Ramon

111 Deerwood Rd Ste 168San Ramon, CA 94583
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed

The Real Gut Doctor

2101 Geer Rd Ste 118Turlock, CA 95382
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

Northern California Surgical Center

3850 Geer RdTurlock, CA 95382
Mon6:00 am - 5:00 pm
Tue6:00 am - 5:00 pm
Wed6:00 am - 5:00 pm
Thu6:00 am - 5:00 pm
Fri6:00 am - 5:00 pm
SatClosed
SunClosed

Emanuel Medical Center Inc

825 Delbon AveTurlock, CA 95382

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Dr. Jeffrey C G Mark, MDDr. Leila NeshatianTheresa Obonyano, APRNRachel Oliver, APRN
GastroenterologyGastroenterologyGastroenterologyGastroenterology
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
4.3 
34 Years of Experience 25 Years of Experience
No Virtual Visit Option No Virtual Visit Option Virtual Visit Available Virtual Visit Available
Speaks Chinese, Spanish Speaks English, Spanish Speaks English Speaks English
San Ramon , CAEmeryville , CASACRAMENTO , CASACRAMENTO , CA
Med School: University Of Illinois At Chicago College Of Medicine Med School: Shahid Beheshti University Of Medical Sciences Med School: The University of Texas Health Science Center at Houston Med School: University of South Alabama
Current Profile
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Insurance Plans Accepted by Dr. Jeffrey C G Mark

  • Accepts Medicare
  • Accepts Medicaid

Medical Specialties

Dr. Jeffrey C G Mark has the following specialty

Specialty Expertise

Dr. Jeffrey C G Mark has the following 14 areas of expertise

  • Abdominal Pain
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Acid Reflux Disease (GERD)
  • Acupuncture
  • Celiac Disease
  • Colonoscopy
  • Constipation
  • Eating Disorders
  • Heartburn
  • Hemorrhoids
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Nutritional Support
  • Ulcerative Colitis

Certifications, License, & Education

34 Years Experience

Dr. Jeffrey C G Mark 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

Residency

Completed their residency at University Of Texas Health System.

Medical School

Graduated from University Of Illinois At Chicago College Of Medicine in 1992.

NPI Number

Dr. Mark's NPI number is 1487603155.

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Frequently Asked Questions

Does Dr. Jeffrey Mark accept virtual/telehealth appointments?
Dr. Jeffrey Mark has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Which hospitals is Dr. Jeffrey Mark affiliated with?
Dr. Jeffrey Mark is affiliated with Doctors Medical Center Of Modesto, San Ramon Regional Medical Center, and Emanuel Medical Center Inc.
Where is Dr. Jeffrey Mark's office located?
Dr. Jeffrey Mark's office is located at 111 Deerwood Rd Ste 168, San Ramon, CA, 94583.
Does Dr. Jeffrey Mark accept my insurance?
You can see the insurance plans that Dr. Jeffrey Mark accepts on their Vitals profile.
Is Dr. Jeffrey Mark accepting new patients?
Dr. Jeffrey Mark is accepting new patients on Vitals. View Dr. Jeffrey Mark's profile on Vitals to make an appointment.

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