Margaret Mass, MD

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

License

MD70026676 Issued in WA

Practice address

3901 Hoyt Ave
Everett, WA 98201-4918

Phone

(425) 303-3091

NPI assigned

Jun 6, 2022

Sex

Female

Sole proprietor

No

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

Specialty

Family Practice

Education

University of Illinois College of Med (CHI/Peor/Rock/CHM-Urb), 2022

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

The Polyclinic PLLCGroup PAC ID 2163328196, 364 clinicians

Practice addresses (Care Compare)

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mmass100579@direct.tecmc.com

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.

• The Polyclinic PLLC

  dba Optum - Broadway

  • Audiologist
  • Seattle, WA
  • NPI 1174594634

  Family Medicine

  Medicare reassignment Care Compare group NPD
• Optum Care Washington PLLC

  • Multi-Specialty Clinic/Center
  • Everett, WA
  • NPI 1831186766

  Family Medicine

  Medicare reassignment NPD
• Optum Care Washington PLLC

  • Durable Medical Equipment & Medical Supplies
  • Marysville, WA
  • NPI 1194428425

  Family Medicine

  NPD
• The Polyclinic PLLC

  dba Optum Tacoma

  • Durable Medical Equipment & Medical Supplies
  • Tacoma, WA
  • NPI 1831411487

  Family Medicine

  NPD
• The Polyclinic PLLC

  dba Optum Care Washington

  • Durable Medical Equipment & Medical Supplies
  • Seattle, WA
  • NPI 1346620200

  Family Medicine

  NPD (past)

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

{
    "created_epoch": "1654473600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1784505600000",
    "number": "1083343107",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7600 EVERGREEN WAY",
            "city": "EVERETT",
            "state": "WA",
            "postal_code": "982036421",
            "telephone_number": "206-860-5414"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3901 HOYT AVE",
            "city": "EVERETT",
            "state": "WA",
            "postal_code": "982014918",
            "telephone_number": "425-303-3091"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MASS",
        "first_name": "MARGARET",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2022-06-06",
        "last_updated": "2026-07-20",
        "certification_date": "2026-07-20",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "WA",
            "license": "MD70026676",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Eyonna Mason-Vaughn, LMHCA
• Jeff R Mason, M.D.
• Jennifer Mason
• Tammy Mason
• Caroline Mass
• Brooks Alfonso Massey
• Cethanie Dare Massingale
• Matthew Massoud, PHARMD
• Karina Nicole Matavao
• Aleza Matayoshi, MD

• Family Medicine Physician in Everett, WA
• Providers in Everett, WA by specialty
• Family Medicine Physician in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 20, 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.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.