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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

KEN D. NGUYEN, M.D., INC.
NPI 1649189622
Internal Medicine in Los Angeles, CA

Active since September 04, 2026
709 N HILL ST STE 16, LOS ANGELES, CA 90012(626) 888-8616(855) 741-0408 Get Directions Write a Review

NPPES record added: October 16, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 16, 2026, Oct 10, 2026, Sep 19, 2026 and 1 more (4 updates tracked since 2026).

About Ken D. Nguyen, M.d., Inc. NPPES

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

KEN D. NGUYEN, M.D., INC. (NPI 1649189622), doing business as Harmony Medical, is a healthcare organization registered as an internal medicine in Los Angeles, California and active in the NPI registry since September 2026. The organization lists Ken D Nguyen, President, as its authorized official.

NPPES Registry Identity

NPI1649189622
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameKEN D. NGUYEN, M.D., INC.
Location Address709 N HILL ST STE 16Los Angeles, CA 90012-2352
Mailing AddressPo Box 597Temple City, CA 91780-0597 · (626) 888-8616 · Fax (855) 741-0408
Phone(626) 888-8616
Fax(855) 741-0408
Organization SubpartYes
Authorized OfficialKen D NguyenPresident · (626) 898-4560
Enumeration DateSeptember 4, 2026
Last NPPES UpdateOctober 16, 20264 updates tracked since enumeration
NPPES CertifiedOctober 16, 2026
✔ NPI 1649189622 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedFamily MedicineTaxonomy 207Q00000X
Also ListedHospitalistTaxonomy 208M00000X
709 N HILL ST STE 16, Los Angeles, CA 90012
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Other Names 1

Doing Business AsHarmony Medical

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 Ken D. Nguyen, M.D., Inc.'s NPI number?

The NPI number for Ken D. Nguyen, M.D., Inc. is 1649189622. It was assigned to this organization in the NPPES registry on September 4, 2026. The provider is doing business as Harmony Medical.

Where is Ken D. Nguyen, M.D., Inc. located?

Ken D. Nguyen, M.D., Inc. is located at 709 N Hill St Ste 16, Los Angeles, CA 90012. The listed phone number is (626) 888-8616.

What is Ken D. Nguyen, M.D., Inc.'s specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Ken D. Nguyen, M.D., Inc. was last updated on October 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 days 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.