Gastroenterology / Hepatology Clinic


Jacquelyn Maher, Chief
Lukejohn Day, Director of Clinical Gastroenterology
Patty Coggan, Nurse Director
Dana Nelson, Nursing Manager


Zuckerberg San Francisco General’s Gastroenterology 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, 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
1:00PM – 5:00PM
8:00AM – 12:00PM 8:00AM – 12:00PM
1:00 – 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



Go to Zuckerberg San Francisco General, 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.





Endoscopy Instructions for Patients:






Patient Education:








Providers with Privileges

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

Zuckerberg San Francisco General Hospital and Trauma Center is part of the SF Health Network.

Learn more

Please call 9-1-1 if this is a medical emergency.

Please call Zuckerberg San Francisco General Hospital at (415) 206-8000 for general information.

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Any questions, comments or suggestions about this site may be directed to Linda Acosta.