Masly Harsono, DDS, MS, DMD

Primary specialty

General Practice DentistryTaxonomy code 1223G0001X

License

64977 Issued in CA

Practice address

431 Monterey Ave Ste 6
Los Gatos, CA 95030-5319

Phone

(408) 354-1717

NPI assigned

Dec 17, 2013

Last updated

Dec 14, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Master of Science

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Harsono Dental Corp

  • General Practice Dentistry
  • Los Gatos, CA
  • NPI 1225588254
  NPD Authorized official
• Ronald T Marsuura

  • General Practice Dentistry
  • Los Gatos, CA
  • NPI 1013182344
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1387238400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765670400000",
    "number": "1669893731",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "431 MONTEREY AVE STE 6",
            "city": "LOS GATOS",
            "state": "CA",
            "postal_code": "950305319",
            "telephone_number": "408-354-1717",
            "fax_number": "408-395-7664"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "431 MONTEREY AVE STE 6",
            "city": "LOS GATOS",
            "state": "CA",
            "postal_code": "950305319",
            "telephone_number": "408-354-1717"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "505 South Dr Ste 3",
            "address_purpose": "LOCATION",
            "city": "Mountain View",
            "state": "CA",
            "postal_code": "940404210",
            "country_code": "US",
            "telephone_number": "650-964-8484",
            "fax_number": "650-964-8485",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HARSONO",
        "first_name": "MASLY",
        "name_prefix": "Dr.",
        "credential": "DDS, MS, DMD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2013-12-17",
        "last_updated": "2025-12-14",
        "certification_date": "2025-12-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1223G0001X",
            "taxonomy_group": "",
            "desc": "Dentist, General Practice",
            "state": "MA",
            "license": "DN1855466",
            "primary": false
        },
        {
            "code": "1223G0001X",
            "taxonomy_group": "",
            "desc": "Dentist, General Practice",
            "state": "CA",
            "license": "64977",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Nia L Harris
• Shenel La Tanya Harris
• Brent Scott Harrison, MA, MFT
• Harrup Kaur, MD, Inc. (Kaur Eye Institute)
• Harsono Dental Corp
• Katherine Hart, OTD, OTR/L
• Erin Elizabeth Hartnett, DAOM, LAC
• Katelyn Harvey, OTR/L
• Ahmadullah Hasani, PT, DPT
• Christine L Haskell, LPN-SFA

• General Practice Dentistry in Los Gatos, CA
• Providers in Los Gatos, CA by specialty
• General Practice Dentistry in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 14, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.