Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

STEPHEN WILLIAMS CRNA
NPI 1043781412
Nurse Anesthetist, Certified Registered in Seattle, WA

Q: What is Stephen Williams's NPI number?

The NPI number for Stephen Williams is 1043781412. It was assigned to this individual provider in the NPPES registry on December 11, 2018.

Q: What is Stephen Williams's specialty?

The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.

Q: When was this NPI record last updated?

The NPPES record for Stephen Williams was last updated on September 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 52 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since December 11, 2018

1100 9TH AVE, SEATTLE, WA 98101(206) 223-6980(206) 223-6982 Get Directions Write a Review

NPPES record last updated: September 9, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 9, 2026, Jul 21, 2026, Dec 11, 2018 (3 updates tracked since 2018).

On this page

About Stephen Williams Crna NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

STEPHEN WILLIAMS CRNA (NPI 1043781412) is an individual nurse anesthetist, certified registered in Seattle, Washington, licensed in Washington (AP70131226) and active in the NPI registry since December 2018. He is a graduate of Other (2022).

NPPES Registry Identity

NPI1043781412

Entity TypeIndividualMale

Primary Taxonomy367500000X

Provider Legal NameSTEPHEN WILLIAMSCredential: CRNA

Location Address1100 9TH AVESeattle, WA 98101-2756

Mailing AddressPo Box 741515Los Angeles, CA 90074-1515 · (206) 223-6980 · Fax (206) 223-6982

Phone(206) 223-6980

Fax(206) 223-6982

Sole ProprietorNo

Medical School CMSOtherGraduated 2022

Enumeration DateDecember 11, 2018

Last NPPES UpdateSeptember 9, 20263 updates tracked since enumeration

NPPES CertifiedSeptember 9, 2026

✔ NPI 1043781412 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Anesthetist, Certified RegisteredPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code367500000X

License✔ Licensed in WA · AP70131226

Definition

(1) A licensed registered nurse with advanced specialty education in anesthesia who, in collaboration with appropriate health care professionals, provides preoperative, intraoperative, and postoperative care to patients and assists in management and resuscitation of critical patients in intensive care, coronary care, and emergency situations. Nurse anesthetists are certified following successful completion of credentials and state licensure review and a national examination directed by the Council on Certification of Nurse Anesthetists. (2) A registered nurse who is qualified by special training to administer anesthesia in collaboration with a physician or dentist and who can assist in the care of patients who are in critical condition.

Also ListedLicensed Practical NurseTaxonomy 164W00000X · License LP60869466 (WA)

1100 9TH AVE, Seattle, WA 98101

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Premera Blue Cross Blue Shield of Alaska.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Stephen Williams Crna is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID3072077486

PECOS Enrollment IDI20260715004147

Medicare Billing Reassignment

Medicare enrollment records show Stephen Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Virginia Mason Medical Center

Same address

Gastroenterology

1100 9TH AVE
Seattle, WA 98101

Reassigned Medicare billing, Washington enrollment
1,021 clinicians in this Medicare group

NPI 1003970989 (206) 223-6600

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JACLYN ANN SUBKOVIAK OT

Occupational Therapist

1100 9TH AVE
SEATTLE, WA 98101

King County (206) 341-0461

MARCIE G HUME PHARM.D.

Pharmacist

1100 9TH AVE, MS C3-PO
SEATTLE, WA 98101

King County (206) 223-6877

DR. VINAY GUPTA MD

Internal Medicine (Critical Care Medicine)

1100 9TH AVE
SEATTLE, WA 98101

King County (206) 223-6980

MARY JO BUKOVIC CCP

Contractor

1100 9TH AVE
SEATTLE, WA 98101

King County (206) 223-6600

PEGAH SAFAEIAN D.O.

Physical Medicine & Rehabilitation

1100 9TH AVE
SEATTLE, WA 98101

King County (206) 223-6600

MRS. GENEVIEVE HOUDET-COTE SLP

Speech-Language Pathologist

1100 9TH AVE, MS:H4-PMR
SEATTLE, WA 98101

King County (206) 341-0461

ROBERT DALE MCCLURE MD

Surgery

1100 9TH AVE
SEATTLE, WA 98101

King County (206) 223-6600

VIRGINIA MASON MEDICAL CENTER

Internal Medicine (Gastroenterology)

1100 9TH AVE
SEATTLE, WA 98101

King County (206) 223-6600

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Stephen Williams's NPI number?

The NPI number for Stephen Williams is 1043781412. It was assigned to this individual provider in the NPPES registry on December 11, 2018.

Where is Stephen Williams located?

Stephen Williams practices at 1100 9th Ave, Seattle, WA 98101. The listed phone number is (206) 223-6980.

What is Stephen Williams's specialty?

The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.

Is Stephen Williams enrolled in Medicare?

Yes. Stephen Williams is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Stephen Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Williams reassigns Medicare benefits to Virginia Mason Medical Center (Seattle, WA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Stephen Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Stephen Williams accept?

Health plans from Premera Blue Cross Blue Shield of Alaska list Stephen Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Stephen Williams was last updated on September 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 52 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.