GASTROENTEROLOGY SPECIALISTS MEDICAL GROUP, INC A MEDICAL CORPORATION
NPI 1629170998
Internal Medicine - Gastroenterology in Castro Valley, CA

Q: What is Gastroenterology Specialists Medical Group, Inc A Medical Corporation's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Active since September 05, 2006CLIA 05D2315838 · Certificate of Compliance

19845 LAKE CHABOT RD, SUITE 104, CASTRO VALLEY, CA 94546(510) 537-4415 Get Directions Write a Review

NPPES record last updated: August 1, 2022. Verified against the NPPES registry weekly; last sync: July 26, 2026.

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About Gastroenterology Specialists Medical Group, Inc A Medical Corporation NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GASTROENTEROLOGY SPECIALISTS MEDICAL GROUP, INC A MEDICAL CORPORATION (NPI 1629170998), doing business as Gastroenterology Specialists Medical Group, is a healthcare organization registered as a gastroenterology in Castro Valley, California and active in the NPI registry since September 2006. The organization holds a CLIA Certificate of Compliance certificate valid through November 19, 2027 and lists Wei-fang Ko Ko, President, as its authorized official.

NPPES Registry Identity

NPI1629170998

Entity TypeOrganization

Primary Taxonomy207RG0100X

Legal Business NameGASTROENTEROLOGY SPECIALISTS MEDICAL GROUP, INC A MEDICAL CORPORATION

Location Address19845 LAKE CHABOT RD, SUITE 104Castro Valley, CA 94546-4055

Mailing Address19845 Lake Chabot Rd, Suite 104Castro Valley, CA 94546-4055 · (510) 537-4415

Phone(510) 537-4415

Organization SubpartNo

Authorized OfficialWei-fang Ko KoPresident · (510) 537-4415

Enumeration DateSeptember 5, 2006

Last NPPES UpdateAugust 1, 2022

NPPES CertifiedAugust 1, 2022

✔ NPI 1629170998 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

Definition

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.

19845 LAKE CHABOT RD, Castro Valley, CA 94546

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Other Names 1

Former Legal Business NameGastroenterology Specialists Medical Group

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X MULTIPLE SINGLE SPECIALTY GROUP

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Compliance 05D2315838

Gastroenterology Specialists Medical Group · Castro Valley, CA

Active · expires Nov 19, 2027

CLIA Number05D2315838

Laboratory TypePhysician Office

Certificate Effective DateNovember 20, 2025

Certificate Expiration DateNovember 19, 2027

Laboratory DirectorMichael S. Lewis

Laboratory Phone(617) 794-8967

Laboratory LocationGastroenterology Specialists Medical Group19845 Lake Chabot Ste 104, Castro Valley, CA 94546

CLIA data matches this NPI record on: Name

This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ALAN R. SILVERMAN M.D. INC

Family Medicine

19845 LAKE CHABOT RD, SUITE 301
CASTRO VALLEY, CA 94546

Alameda County (510) 881-5203

VISHAL GHEVARIYA M.D.

Internal Medicine (Gastroenterology)

19845 LAKE CHABOT RD, STE 104
CASTRO VALLEY, CA 94546

Alameda County (510) 537-4415

DR. CAROLYN ELIZABETH MCALOON DPM

Podiatrist (Foot & Ankle Surgery)

19845 LAKE CHABOT RD, SUITE 301
CASTRO VALLEY, CA 94546

Alameda County (510) 581-1484

GEORGE D COWEN, MD PROFESSIONAL CORP

Internal Medicine

19845 LAKE CHABOT RD, SUITE 211
CASTRO VALLEY, CA 94546

Alameda County (510) 582-6966

MR. JEAN-PIERRE LOUIS VIEL PT, DPT, OCS

Physical Therapist

19845 LAKE CHABOT RD, SUITE 205
CASTRO VALLEY, CA 94546

Alameda County (510) 538-9558

DR. AMBER LOUISE JONES D.O., M.P.H.

Surgery (Trauma Surgery)

19845 LAKE CHABOT RD
CASTRO VALLEY, CA 94546

Alameda County (510) 538-5500

DR. TERENCE CHUCK WONG D.D.S.

Dentist (General Practice)

19845 LAKE CHABOT RD, SUITE #210
CASTRO VALLEY, CA 94546

Alameda County (510) 581-7788

SARAH H LINDAHL PAC

Physician Assistant

19845 LAKE CHABOT RD, SUITE #302
CASTRO VALLEY, CA 94546

Alameda County (510) 886-3400

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gastroenterology Specialists Medical Group, Inc A Medical Corporation's NPI number?

The NPI number for Gastroenterology Specialists Medical Group, Inc A Medical Corporation is 1629170998. It was assigned to this organization in the NPPES registry on September 5, 2006. The provider was formerly known as Gastroenterology Specialists Medical Group.

Where is Gastroenterology Specialists Medical Group, Inc A Medical Corporation located?

Gastroenterology Specialists Medical Group, Inc A Medical Corporation is located at 19845 Lake Chabot Rd Suite 104, Castro Valley, CA 94546. The listed phone number is (510) 537-4415.

What is Gastroenterology Specialists Medical Group, Inc A Medical Corporation's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Does Gastroenterology Specialists Medical Group, Inc A Medical Corporation hold a CLIA laboratory certificate?

Yes. A Certificate of Compliance (number 05D2315838) is associated with this NPI, valid through November 19, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Gastroenterology Specialists Medical Group, Inc A Medical Corporation was last updated on August 1, 2022. NPI Profile syncs with the weekly NPPES data releases published by CMS.