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DR. MASLY HARSONO DDS, MS, DMD
NPI 1669893731
Dentist - General Practice in Los Gatos, CA

Active since December 17, 2013
431 MONTEREY AVE STE 6, LOS GATOS, CA 95030(408) 354-1717 Get Directions Write a Review

NPPES record last updated: December 14, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Dec 14, 2025, May 17, 2023, Jul 21, 2022 and 3 more (6 updates tracked since 2016).

About Dr. Masly Harsono Dds, Ms, Dmd NPPES

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

DR. MASLY HARSONO DDS, MS, DMD (NPI 1669893731) is an individual general practice provider in Los Gatos, California, licensed in California (64977) and active in the NPI registry since December 2013. He maintains a secondary practice location in Mountain View.

NPPES Registry Identity

NPI1669893731
Entity TypeIndividualMale
Primary Taxonomy1223G0001X
Provider Legal NameDR. MASLY HARSONOCredential: DDS, MS, DMD
Location Address431 MONTEREY AVE STE 6Los Gatos, CA 95030-5319
Mailing Address431 Monterey Ave Ste 6Los Gatos, CA 95030-5319 · (408) 354-1717 · Fax (408) 395-7664
Phone(408) 354-1717
Sole ProprietorYes
Enumeration DateDecember 17, 2013
Last NPPES UpdateDecember 14, 20256 updates tracked since enumeration
NPPES CertifiedDecember 14, 2025
✔ NPI 1669893731 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers
Taxonomy Code1223G0001X
Licenses✔ Licensed in CA · 64977✔ Licensed in MA · DN1855466
Definition
A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.
431 MONTEREY AVE STE 6, Los Gatos, CA 95030
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Secondary Practice Location 1

Location 1505 South Dr Ste 3Mountain View, CA 94040-4210 · Phone (650) 964-8484 · Fax (650) 964-8485

Other Providers at the Same Location NPPES

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

HARSONO DENTAL CORP
Dentist (General Practice)
431 MONTEREY AVE STE 6
LOS GATOS, CA 95030
Santa Clara County (408) 354-1717

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 Masly Harsono's NPI number?

The NPI number for Masly Harsono is 1669893731. It was assigned to this individual provider in the NPPES registry on December 17, 2013.

Where is Masly Harsono located?

Masly Harsono practices at 431 Monterey Ave Ste 6, Los Gatos, CA 95030. The listed phone number is (408) 354-1717.

What is Masly Harsono's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

When was this NPI record last updated?

The NPPES record for Masly Harsono was last updated on December 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.