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Internist, Gastroenterologist (digestive)
12 years of experience
Accepting new patients
License & Identifications

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).

Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. John Lah is Average. Dr. Lah has been reviewed by 3 patients who have provided 3 comments. The rating is 2.5 out of 5 stars.

Patient Ratings
Ease of Appointment 2.8
Promptness 2.8
Courteous Staff 2.3
Accurate Diagnosis 2.3
Bedside Manner 2.3
Spends Time with Me 2.3
Follows Up After Visit 2.3

Specialties & Research

Dr. John Lah, MD is board certified in Internal Medicine and Gastroenterology.

  • He has special expertise in 5 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Lah graduated from New York Medical College, Valhalla.


Dr. Lah has 3 hospital affiliations:

  • Whittier Hospital Medical Center 
  • Presbyterian Intercommunity Hospital 
  • Barlow Respiratory Hospital 


  • Korean

> > > > Dr. John Lah, MD

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Additional Information
Dr. John J Lah MD is a male Internist, has 12 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. John J. Lah practice?
Dr. John Lah has 1 office location.
Dr. John Lah practices Internal Medicine and Gastroenterology near Whittier, CA.
See Whittier Internists and Whittier Gastroenterologists.