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Gastroenterology in Fontana, CA

The federal NPI Registry lists 11 gastroenterologists with a practice address in Fontana.

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Gastroenterologists in Fontana

Alphabetical, from the federal NPI Registry (CMS), fetched 2026-11-05. Not a ranking or an endorsement; nobody pays to appear in this list. Confirm details with each office.

  • Alexander Han, MD

    Internal Medicine, Gastroenterology

    9961 Sierra Ave · 92335

    909-427-5000

  • David Kestenbaum, MD

    Internal Medicine, Gastroenterology

    9961 Sierra Ave · 92335

    909-427-3910

  • Eve Kirschner, MD

    Internal Medicine, Gastroenterology

    9961 Sierra Ave · 92335

    909-427-3910

  • Patricia Hsia, MD

    Internal Medicine, Gastroenterology

    9961 Sierra Ave · 92335

    909-427-3910

  • Scott Marnoy, MD

    Internal Medicine, Gastroenterology

    9961 Sierra Ave · 92335

    909-427-3910

  • Timothy Jenkins, MD

    Internal Medicine, Gastroenterology

    9961 Sierra Ave · 92335

    909-427-3910

  • Timothy Mccarter, MD

    Internal Medicine, Gastroenterology

    9961 Sierra Ave · 92335

    909-427-7830

  • Tommy Oei, MD

    Internal Medicine, Gastroenterology

    9961 Sierra Ave · 92335

    909-427-3910

Plus 3 more registered in Fontana. Search them all at npiregistry.cms.hhs.gov.

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Questions people ask

How many gastroenterologists practice in Fontana?
The federal NPI Registry lists 11 gastroenterologists with a practice address in Fontana. Source: CMS NPI Registry, practice-location addresses.
Can a practice sponsor the Gastroenterology page for Fontana?
Yes. This page has 1 sponsor position, sold for a flat monthly fee and always labeled "Sponsored". Fees never depend on patients, calls or leads.

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