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THOMAS G AHN M D A PROF CORP
NPI 1982720728
Internal Medicine - Endocrinology, Diabetes & Metabolism in Los Angeles, CA

Active since March 22, 2007
2080 CENTURY PARK E, SUITE 1410, LOS ANGELES, CA 90067(310) 277-7600(310) 553-9103 Get Directions Write a Review

NPPES record last updated: December 29, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Thomas G Ahn M D A Prof Corp NPPES

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

THOMAS G AHN M D A PROF CORP (NPI 1982720728) is a healthcare organization registered as an endocrinology, diabetes & metabolism in Los Angeles, California and active in the NPI registry since March 2007. The organization lists Thomas G Ahn, Owner, as its authorized official.

NPPES Registry Identity

NPI1982720728
Entity TypeOrganization
Primary Taxonomy207RE0101X
Legal Business NameTHOMAS G AHN M D A PROF CORP
Location Address2080 CENTURY PARK E, SUITE 1410Los Angeles, CA 90067-2001
Mailing Address2080 Century Park E, Suite 1410Los Angeles, CA 90067-2001 · (310) 277-7600 · Fax (310) 553-9103
Phone(310) 277-7600
Fax(310) 553-9103
Organization SubpartNo
Authorized OfficialThomas G AhnOwner · (310) 277-7600
Enumeration DateMarch 22, 2007
Last NPPES UpdateDecember 29, 2025
NPPES CertifiedDecember 29, 2025
✔ NPI 1982720728 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ 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.
2080 CENTURY PARK E, Los Angeles, CA 90067
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 MULTIPLE SINGLE 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)

Thomas G Ahn M D A Prof Corp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Thomas G Ahn M D A Prof Corp, which bills Medicare for the services this clinician delivers.

Clinician (1)

Thomas Ahn, MD
Endocrinology
NPI 1669556866
2080 CENTURY PARK E STE 1410
Los Angeles, CA 90067
(310) 277-7600
✔ PECOS✔ Accepts MedicareSame address

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 Thomas G Ahn M D A Prof Corp's NPI number?

The NPI number for Thomas G Ahn M D A Prof Corp is 1982720728. It was assigned to this organization in the NPPES registry on March 22, 2007.

Where is Thomas G Ahn M D A Prof Corp located?

Thomas G Ahn M D A Prof Corp is located at 2080 Century Park E Suite 1410, Los Angeles, CA 90067. The listed phone number is (310) 277-7600.

What is Thomas G Ahn M D A Prof Corp's specialty?

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

Is Thomas G Ahn M D A Prof Corp enrolled in Medicare?

Yes. Thomas G Ahn M D A Prof Corp is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Thomas G Ahn M D A Prof Corp?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Endocrinology) reassigns their Medicare billing to Thomas G Ahn M D A Prof Corp. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Thomas G Ahn M D A Prof Corp was last updated on December 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.