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A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

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Specialties & Research

Dr. John Maa, MD is board certified in Surgery.

  • He has special expertise in 11 areas:
  • Appendectomy
  • Central Venous Catheterization
  • Cholangiography
  • Femoral Hernia
  • Galbladder Removal (Cholecystectomy)
  • Gastrointestinal Cancer
  • Inguinal Hernia
  • Jejunostomy
  • Laproscopic Surgery (Laparoscopy)
  • Percutaneous Endoscopic Gastrostomy (PEG)
  • Ventral Hernia

Education & Awards

Dr. Maa graduated from Harvard University , Boston.


Dr. Maa has 4 hospital affiliations:

  • UCSF Medical Center / Moffitt-Long Hospitals 
  • San Mateo Medical Center 


  • Chinese
  • Mandarin
  • Spanish

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Additional Information
Dr. John Maa MD is a male Surgeon, has 17 years of experience and practices in Surgery.
Where does Dr. John Maa practice?
Dr. John Maa has 2 office locations.
Dr. John Maa practices Surgery near San Francisco, CA.
Additional practice locations include: San Mateo, CA.
See San Francisco Surgeons.