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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

TIK L TJOA MD
NPI 1811943186
Internal Medicine - Endocrinology, Diabetes & Metabolism in Ponoma, CA

Active since May 26, 2006
3530 WEST POMONA BLVD, PONOMA, CA 91769(909) 595-1221 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

About Tik L Tjoa Md NPPES

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

TIK L TJOA MD (NPI 1811943186) is an individual endocrinology, diabetes & metabolism provider in Ponoma, California, licensed in California (A29682) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1811943186
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameTIK L TJOACredential: MD
Location Address3530 WEST POMONA BLVDPonoma, CA 91769-0100
Mailing Address1600 9th St, Room 205 Mailstop 2-3Sacramento, CA 95814-6414 · (916) 654-2431 · Fax (916) 654-3186
Phone(909) 595-1221
Sole ProprietorNo
Enumeration DateMay 26, 2006
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1811943186 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in CA · A29682
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
Also ListedInternal MedicineTaxonomy 207R00000X · License A29682 (CA)
3530 WEST POMONA BLVD, Ponoma, CA 91769
Open in Google Maps ↗

Other Providers at the Same Location NPPES 12

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

DR. GREGORY PAUL STONE DDS
Dentist
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
DR. DAVID A SMITH PHD
Psychologist (Clinical)
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
BA NGOC TRAN MD
Pediatrics
3530 WEST POMONA BLVD
PONOMA, CA 91769
Los Angeles County (909) 595-1221
ELHAMY FAWZY KHALIL MD
Pediatrics
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
DR. JOANNE IHM KOO MD
Internal Medicine
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
CUONG HUU NGHIEM MD
General Practice
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
DR. YIEN-NAN WANG DDS
Dentist
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
DR. CAROL LYNN GANDOLFO PSY D
Psychologist (Intellectual and Developmental Disabilities)
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221

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 Tik Tjoa's NPI number?

The NPI number for Tik Tjoa is 1811943186. It was assigned to this individual provider in the NPPES registry on May 26, 2006.

Where is Tik Tjoa located?

Tik Tjoa practices at 3530 West Pomona Blvd, Ponoma, CA 91769. The listed phone number is (909) 595-1221.

What is Tik Tjoa's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

When was this NPI record last updated?

The NPPES record for Tik Tjoa was last updated on July 13, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.