NPIMap

Individual provider Active NPI

Nathaniel Eric Siev, MD

  • Anesthesiology Physician
  • Tacoma, WA
National Provider Identifier
1023515269
Registry record updated Dec 30, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Anesthesiology PhysicianTaxonomy code 207L00000X
License
MD61218481 Issued in WA
Practice address
1717 S J St
Tacoma, WA 98405-4933
Phone
(253) 426-4101
NPI assigned
Apr 12, 2018
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Dec 30, 2025

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Anesthesiology Physician 207L00000X MD61218481 WA Primary

Addresses

Primary practice location

1717 S J St
Tacoma, WA 98405-4933

Mailing address

1717 S J St
Tacoma, WA 98405-4933
Phone (253) 426-6341

Other practice location 1

1100 9th Ave
Seattle, WA 98101-2756
Phone (206) 223-6600

Other identifiers 1

IdentifierTypeStateIssuer
2205683MedicaidWA

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in WA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20220623000973 WA Practitioner - Anesthesiology 6002154978 Reassigns benefits to 5 organizations

Care Compare profile

Medicare Care Compare
Specialty
Anesthesiology
Education
Other, 2018
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Franciscan Medical GroupGroup PAC ID 0547173866, 1,400 clinicians

Practice addresses (Care Compare)

1717 S J St
Tacoma, WA 98405-4933
Phone (253) 426-6341

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

Practice roles

OrganizationSpecialtyStatusNew patients
Western Washington Medical Group, Inc, PS CurrentSince Dec 5, 2023 Accepting new patients
Seattle Hand Surgery Group PC CurrentSince Dec 5, 2023 Accepting new patients
Virginia Mason Medical Center CurrentSince Sep 1, 2025 Accepting new patients
Franciscan Medical Group Current Accepting new patients
The Association of University Physicians Anesthesiology CurrentSince Jul 1, 2022 Accepting new patients
Virginia Mason Medical Center Current Accepting new patients
Providence Wa Anesthesia Services, P.C. Anesthesiology CurrentSince May 8, 2024 Accepting new patients
Franciscan Medical Group CurrentSince Jan 22, 2024 Accepting new patients
Physicians Anesthesia Service PLLC Anesthesiology Current Accepting new patients
Virginia Mason Medical Center Anesthesiology CurrentSince Sep 1, 2025 Accepting new patients
Franciscan Medical Group CurrentSince Jan 22, 2024 Accepting new patients

Locations

1211 24th St
Anacortes, WA 98221
Phone (360) 293-3181

380 Winslow Way E
Bainbridge Island, WA 98110
Phone (206) 842-5632

1321 Colby Ave
Everett, WA 98201
Phone (425) 259-4413

747 Broadway
Seattle, WA 98122
Phone (360) 658-2488

925 Seneca St
Seattle, WA 98101
Phone (206) 341-0860

1100 9th Ave
Seattle, WA 98101
Phone (206) 223-6980

1959 NE Pacific St
Seattle, WA 98195
Phone (206) 598-4333

1229 Madison St
Ste 1440
Seattle, WA 98104
Phone (206) 625-0578

1550 N 115th St
Shoreline, WA 98133
Phone (206) 364-0500

1717 S J St
Tacoma, WA 98405
Phone (253) 426-4101

1812 S J St
Ste 120
Tacoma, WA 98405
Phone (253) 428-2200

Organizations & group practices 11

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.

Hospital & facility affiliations 3

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

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

{
    "created_epoch": "1523491200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767052800000",
    "number": "1023515269",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1717 S J ST",
            "city": "TACOMA",
            "state": "WA",
            "postal_code": "984054933",
            "telephone_number": "253-426-6341",
            "fax_number": "253-426-6344"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1717 S J ST",
            "city": "TACOMA",
            "state": "WA",
            "postal_code": "984054933",
            "telephone_number": "253-426-4101"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1100 9th Ave",
            "address_purpose": "LOCATION",
            "city": "Seattle",
            "state": "WA",
            "postal_code": "981012756",
            "country_code": "US",
            "telephone_number": "206-223-6600",
            "fax_number": "206-223-6982",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SIEV",
        "first_name": "NATHANIEL",
        "middle_name": "ERIC",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-04-12",
        "last_updated": "2025-12-30",
        "certification_date": "2025-12-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "WA",
            "license": "MD61218481",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "2205683",
            "state": "WA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Tacoma, WA

Sources for this page

Verify at the official NPI Registry.