Summary

Dr. Jeffrey Mark is a gastroenterologist with 34 years of experience helping patients with digestive health concerns. 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. Dr. Mark speaks both Chinese and Spanish, making healthcare more accessible to diverse communities.

Dr. Mark practices at multiple locations across 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 expertise includes treating hemorrhoids, colon polyps, and skin tags. Dr. Mark performs colonoscopies, lower gastrointestinal endoscopy, and laparoscopic procedures to diagnose and treat digestive conditions. Patients rate him 4.3 out of 5 stars for his care.

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
  • 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. Tahereh GhazianiJi Soo Choi, APRNJan Seiler, APRN
GastroenterologyGastroenterologyGastroenterologyGastroenterology
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
4.3 
34 Years of Experience
No Virtual Visit Option No Virtual Visit Option Virtual Visit Available Virtual Visit Available
Speaks Chinese, Spanish Speaks English Speaks English Speaks English
San Ramon , CARedwood City , CASacramento , CAMontgomery , AL
Med School: University Of Illinois At Chicago College Of Medicine Med School: New York University Med School: Georgia State University
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

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.
How can I make an appointment with Dr. Jeffrey Mark?
You can find contact information for Dr. Jeffrey Mark here on Vitals.
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.
What languages does Dr. Jeffrey Mark speak?
Dr. Jeffrey Mark speaks Chinese and Spanish.
Does Dr. Jeffrey Mark accept my insurance?
You can see the insurance plans that Dr. Jeffrey Mark accepts on their Vitals profile.

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