Demitrios Leonidas Master, MD

Primary specialty

Student in an Organized Health Care Education/Training ProgramTaxonomy code 390200000X

Practice address

611 12TH Ave S
Seattle, WA 98144-2007

Phone

(206) 324-9360

Fax

(206) 324-8910

NPI assigned

Mar 25, 2026

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

Enrolled in WA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

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

• Swedish Health Services

  • Clinic/Center
  • Seattle, WA
  • NPI 1790099471
  NPD (past)

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

{
    "created_epoch": "1774396800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1774396800000",
    "number": "1790624831",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "550 16TH AVE STE 400",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981225636",
            "telephone_number": "206-320-2233"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "611 12TH AVE S",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981442007",
            "telephone_number": "206-324-9360",
            "fax_number": "206-324-8910"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MASTER",
        "first_name": "DEMITRIOS",
        "middle_name": "LEONIDAS",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2026-03-25",
        "last_updated": "2026-03-25",
        "certification_date": "2026-03-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Elaine Mast
• Matthew Mast, DPT
• Sharon Mast, LICSW
• Victoria Mastel, MSW
• Sue Masten, M.D.
• Sarah Masters
• John Masterson
• Reilly Blake Masterson, MA, CCC-SLP
• Jessica E. Mastrangelo, PHD, LMHC
• Catherine Ann Mastroianni, D.C.

• Student in an Organized Health Care Education/Training Program in Seattle, WA
• Providers in Seattle, WA by specialty
• Student in an Organized Health Care Education/Training Program in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 25, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.