Individual provider · Type 1 NPI

John W. Roark Jr., MD

Gastroenterology Physician · Oakland, CA

NPI number 1609834266 Active

Practice location

3741 Linwood Ave
Oakland, CA 94602-1711

Call (510) 589-8774 Map

Specialties and licenses

TaxonomyCodeLicense
Gastroenterology Physician Primary 207RG0100XG038581 (CA)

Gastroenterology Physician: An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

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About NPI 1609834266

John W. Roark Jr., MD's National Provider Identifier is 1609834266, issued on May 3, 2006. The primary taxonomy on file is Gastroenterology Physician (207RG0100X), and the practice location is in Oakland, CA. The record was last updated on Feb 10, 2026.