Michael Manchang Siew Jr., DDS, MD

Primary specialty

Oral and Maxillofacial Surgery (Dentist)Taxonomy code 1223S0112X

License

70011270 Issued in WA

Practice address

916 NE Ravenna Blvd
Seattle, WA 98115-5566

Phone

(206) 845-7333

Fax

(206) 672-1369

NPI assigned

May 22, 2017

Last updated

Aug 14, 2026By the provider in NPPES

Sex

Male

Sole proprietor

No

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

Specialties & licenses 4

Addresses

Medicare fee-for-service enrollment

Enrolled in TX

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: No
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/24611/brand/1/csg/1/fhir/r4

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.

• Umc El Paso Healthcare Inc

  • General Practice Physician
  • El Paso, TX
  • NPI 1528683810

  Oral and Maxillofacial Surgery

  Medicare reassignment NPD
• West Texas Maxillofacial Surgery PA

  dba High Desert Oral & Facial Surgery

  • Oral & Maxillofacial Surgery (D.M.D.)
  • El Paso, TX
  • NPI 1700178555
  NPD
• Michael M Siew DDS MD PLLC

  • Oral and Maxillofacial Surgery (Dentist)
  • Seattle, WA
  • NPI 1033038427
  NPD (past)

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

{
    "created_epoch": "1495411200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786665600000",
    "number": "1164959169",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "916 NE RAVENNA BLVD",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981155566",
            "telephone_number": "206-845-7333",
            "fax_number": "206-672-1369"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "916 NE RAVENNA BLVD",
            "city": "SEATTLE",
            "state": "WA",
            "postal_code": "981155566",
            "telephone_number": "206-845-7333",
            "fax_number": "206-672-1369"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIEW",
        "first_name": "MICHAEL",
        "middle_name": "MANCHANG",
        "name_suffix": "Jr.",
        "credential": "DDS, MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2017-05-22",
        "last_updated": "2026-08-14",
        "certification_date": "2026-08-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1223S0112X",
            "taxonomy_group": "",
            "desc": "Dentist, Oral and Maxillofacial Surgery",
            "state": "TX",
            "license": "37666",
            "primary": false
        },
        {
            "code": "204E00000X",
            "taxonomy_group": "",
            "desc": "Oral & Maxillofacial Surgery",
            "state": "WA",
            "license": "70011270",
            "primary": false
        },
        {
            "code": "204E00000X",
            "taxonomy_group": "",
            "desc": "Oral & Maxillofacial Surgery",
            "state": "TX",
            "license": "37666",
            "primary": false
        },
        {
            "code": "1223S0112X",
            "taxonomy_group": "",
            "desc": "Dentist, Oral and Maxillofacial Surgery",
            "state": "WA",
            "license": "70011270",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Albert Richard Siems
• Nasya Sierra, MD
• Bree Sievers, RN, IBCLC
• Gabrielle Sievers
• Kristen Sievert, LMFTA
• Michael Taksang Siew Sr., DDS
• Joshua James Siewert, RBT
• Charisma Jimenea Sifferman, LMP
• Joseph A Sifferman, O.D.
• Lauren Elizabeth Sifferman, LMHCA, ATR-P

• Oral and Maxillofacial Surgery (Dentist) in Seattle, WA
• Providers in Seattle, WA by specialty
• Oral and Maxillofacial Surgery (Dentist) in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 14, 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.