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THOMAS S.LAM MD. A PROFESSIONAL CORPORATION
NPI 1336309350
Internal Medicine - Gastroenterology in Alhambra, CA

Active since June 12, 2008
333 S GARFIELD AVE STE A, ALHAMBRA, CA 91801(626) 284-1997 Get Directions Write a Review

NPPES record last updated: June 17, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jun 17, 2025, Aug 24, 2021 (2 updates tracked since 2021).

About Thomas S.lam Md. A Professional Corporation NPPES

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

THOMAS S.LAM MD. A PROFESSIONAL CORPORATION (NPI 1336309350) is a healthcare organization registered as a gastroenterology in Alhambra, California and active in the NPI registry since June 2008. The organization lists Thomas S. Lam, Director, as its authorized official.

NPPES Registry Identity

NPI1336309350
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameTHOMAS S.LAM MD. A PROFESSIONAL CORPORATION
Location Address333 S GARFIELD AVE STE AAlhambra, CA 91801-3895
Mailing AddressPo Box 7589Alhambra, CA 91802-7589 · (626) 284-1997 · Fax (626) 284-2549
Phone(626) 284-1997
Organization SubpartNo
Authorized OfficialThomas S. LamDirector · (626) 943-6274
Enumeration DateJune 12, 2008
Last NPPES UpdateJune 17, 20252 updates tracked since enumeration
NPPES CertifiedJune 17, 2025
✔ NPI 1336309350 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in CA · A44280
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.
333 S GARFIELD AVE STE A, Alhambra, CA 91801
Open in Google Maps ↗

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 SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 4

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

DR. THOMAS S LAM M.D.
Internal Medicine (Gastroenterology)
333 S GARFIELD AVE STE A
ALHAMBRA, CA 91801
Los Angeles County (626) 284-1997
AMG, A PROFESSIONAL MEDICAL CORPORATION
Internal Medicine (Gastroenterology)
333 S GARFIELD AVE STE A
ALHAMBRA, CA 91801
Los Angeles County (626) 289-7333
TIANYUAN YANG NP
Nurse Practitioner (Family)
333 S GARFIELD AVE STE A
ALHAMBRA, CA 91801
Los Angeles County (626) 284-1997
SUNNY WONG MD
Internal Medicine (Gastroenterology)
333 S GARFIELD AVE STE A
ALHAMBRA, CA 91801
Los Angeles County (626) 284-1997

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 Thomas S.Lam MD. A Professional Corporation's NPI number?

The NPI number for Thomas S.Lam MD. A Professional Corporation is 1336309350. It was assigned to this organization in the NPPES registry on June 12, 2008.

Where is Thomas S.Lam MD. A Professional Corporation located?

Thomas S.Lam MD. A Professional Corporation is located at 333 S Garfield Ave Ste A, Alhambra, CA 91801. The listed phone number is (626) 284-1997.

What is Thomas S.Lam MD. A Professional Corporation's specialty?

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

When was this NPI record last updated?

The NPPES record for Thomas S.Lam MD. A Professional Corporation was last updated on June 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.