Call 9-1-1 for emergencies or (415) 206-7800 for general questions

Gastroenterology / Hepatology


Director of Clinical Gastroenterology
Patty Coggan
Nurse Director
Ditas Hernandez
Nursing Manager

Our division provides a full array of outpatient and inpatient services to patients within the San Francisco Health Network. We have leading experts in the field of both gastroenterology and hepatology and deliver care in an integrative and collaborative approach.  We provide consultation on a full spectrum of gastroenterology (GI) and liver related diseases including patients with acute and chronic liver disease, inflammatory bowel disease, chronic abdominal pain/dyspepsia, AIDS-related GI and liver problems, biliary tract disease, viral hepatitis and disorders of the esophagus and colon/anorectum. To complement our consultative services we also offer a full spectrum of endoscopic services including: EGD, colonoscopy, sigmoidoscopy, advanced endoscopy (ERCP, EUS, balloon enteroscopy), capsule endoscopy, motility/manometry, and 24-hour pH monitoring.


  • Location: Zuckerberg San Francisco General Hospital, Main Building 5, 3rd Floor, Suite 3D
  • Routine clinical issues, please call clinic at 415-206-8823
  • Follow-up patient appointments at 415-206-8823
  • Fax number is 415-206-5199

Hours of Operation:

Direct access endoscopy class
Mon Tues Wed Thurs Fri Sat Sun
2:00PM – 4:00PM - 9:00AM – 12:00PM - - - -


Gastroenterology Clinic
Mon Tues Wed Thurs Fri Sat Sun
- 1:00PM – 4:00PM 1:00PM – 5:00PM 1:00PM – 5:00PM 1:00PM – 4:00PM - -


Mon Tues Wed Thurs Fri Sat Sun
8:00AM – 12:00PM 8:00AM – 12:00PM - 8:00AM – 12:00PM 8:00AM – 12:00PM - -
- 1:00PM – 5:00PM - - 1:00PM – 5:00PM - -


Liver Clinic
Mon Tues Wed Thurs Fri Sat Sun
8:00AM – 5:00PM 8:00AM – 5:00PM 8:00AM – 5:00PM 8:00AM – 5:00PM 8:00AM – 5:00PM - -


Hepatitis C Class
Mon Tues Wed Thurs Fri Sat Sun
- - 3:00PM – 4:00PM - - - -


To locate the Gastroenterology & Hepatology clinic / Para encontrar La Clínica de Gastroenterología y Hepatología:

Go to the main hospital (Building 5). Take the elevators to the 3rd floor. Follow signs for 3D Medical Diagnostic Center. Check-in upon arrival. Vaya al hospital principal (Edificio 5).

Tome el elevador y vaya al piso. Siga las señales para llegar al Centro de Diagnóstico Médico 3D. Regístrese al llegar.



Patient Education:


GI Oct 15

Hepatology Oct 15

*Click image to enlarge

Providers with Privileges

Ardene Ballonado, NP
John Cello, MD
Lukejohn Day, MD
Mandana Khalili, MD
Maria-Idalia Lens, MSN, NP
Jacquelyn Maher, MD
Justin Sewell, MD
Ma Somsouk, MD
Miranda Surjadi, MS, NP
Michele Tana, MD
Michelle Zandian, PA