Gregory Walter Guyman, DDS, MSD

Primary specialty

Orthodontics and Dentofacial Orthopedics DentistryTaxonomy code 1223X0400X

License

4741 Issued in WA

Practice address

6203 SE 30TH St
Mercer Island, WA 98040-2413

Phone

(206) 919-2514

NPI assigned

Oct 29, 2026

Last updated

Oct 29, 2026By 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 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

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

{
    "created_epoch": "1793232000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1793232000000",
    "number": "1245138171",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6203 SE 30TH ST",
            "city": "MERCER ISLAND",
            "state": "WA",
            "postal_code": "980402413",
            "telephone_number": "206-919-2514"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "6203 SE 30TH ST",
            "city": "MERCER ISLAND",
            "state": "WA",
            "postal_code": "980402413",
            "telephone_number": "206-919-2514"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GUYMAN",
        "first_name": "GREGORY",
        "middle_name": "WALTER",
        "name_prefix": "Dr.",
        "credential": "DDS, MSD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2026-10-29",
        "last_updated": "2026-10-29",
        "certification_date": "2026-10-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1223X0400X",
            "taxonomy_group": "",
            "desc": "Dentist, Orthodontics and Dentofacial Orthopedics",
            "state": "WA",
            "license": "4741",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Giselle Greisman, CN
• Elizabeth Evans Gresch, MD
• Ann Marie Griff, O.D.
• Ishani Grover
• Shalini Ruhi Grover
• Jennifer Huwaldt Hall, PA-C
• Jennifer Harkestad
• Kara Hawthorne, LCSW, LICSW
• Rutherford Platt Hayes, MD
• Richard Porter Henderson, PT

• Orthodontics and Dentofacial Orthopedics Dentistry in Mercer Island, WA
• Providers in Mercer Island, WA by specialty
• Orthodontics and Dentofacial Orthopedics Dentistry in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 29, 2026; 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.