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T.H. CHOI, A MEDICAL CORPORATION
NPI 1295758639
Internal Medicine - Endocrinology, Diabetes & Metabolism in Los Alamitos, CA

Active since July 26, 2006
3772 KATELLA AVE STE 107, LOS ALAMITOS, CA 90720(562) 431-7877(562) 431-7882 Get Directions Write a Review

NPPES record last updated: June 30, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 30, 2025, Feb 7, 2023 (2 updates tracked since 2023).

About T.h. Choi, A Medical Corporation NPPES

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

T.H. CHOI, A MEDICAL CORPORATION (NPI 1295758639) is a healthcare organization registered as an endocrinology, diabetes & metabolism in Los Alamitos, California and active in the NPI registry since July 2006. The organization lists Hoon-ji Helen Choi, Owner, as its authorized official.

NPPES Registry Identity

NPI1295758639
Entity TypeOrganization
Primary Taxonomy207RE0101X
Legal Business NameT.H. CHOI, A MEDICAL CORPORATION
Location Address3772 KATELLA AVE STE 107Los Alamitos, CA 90720-6424
Mailing Address7862 Squaw Valley WayCerritos, CA 90703-7843 · (562) 881-3922 · Fax (425) 928-4044
Phone(562) 431-7877
Fax(562) 431-7882
Organization SubpartNo
Authorized OfficialHoon-ji Helen ChoiOwner · (562) 881-3922
Enumeration DateJuly 26, 2006
Last NPPES UpdateJune 30, 20252 updates tracked since enumeration
NPPES CertifiedJune 30, 2025
✔ NPI 1295758639 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
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 ListedEmergency MedicineTaxonomy 207P00000X
3772 KATELLA AVE STE 107, Los Alamitos, CA 90720
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

T.h. Choi, A Medical Corporation is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to T.H. Choi, A Medical Corporation, which bills Medicare for the services they deliver. Of these, 1 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

Hoon Ji Choi, MD
Endocrinology
NPI 1225062888
3772 KATELLA AVE STE 107
Los Alamitos, CA 90720
(562) 431-7877
✔ PECOS✔ Accepts MedicareSame address
Tony Choi, MD
Emergency Medicine
NPI 1457388308
2701 S BRISTOL ST
Santa Ana, CA 92704
(714) 754-5454
✔ PECOS✔ Accepts Medicare12 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 T.H. Choi, A Medical Corporation's NPI number?

The NPI number for T.H. Choi, A Medical Corporation is 1295758639. It was assigned to this organization in the NPPES registry on July 26, 2006.

Where is T.H. Choi, A Medical Corporation located?

T.H. Choi, A Medical Corporation is located at 3772 Katella Ave Ste 107, Los Alamitos, CA 90720. The listed phone number is (562) 431-7877.

What is T.H. Choi, A Medical Corporation's specialty?

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

Is T.H. Choi, A Medical Corporation enrolled in Medicare?

Yes. T.H. Choi, A Medical Corporation is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through T.H. Choi, A Medical Corporation?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to T.H. Choi, A Medical Corporation, in Emergency Medicine and Endocrinology. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 1 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for T.H. Choi, A Medical Corporation was last updated on June 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.