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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

WILLIAM DONALD HAZELTON
NPI 1255258521
Medical Genetics, Ph.D. Medical Genetics in Seattle, WA

Active since June 30, 2026
1100 FAIRVIEW AVE N, SEATTLE, WA 98109(206) 293-1921 Get Directions Write a Review

NPPES record added: June 30, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About William Donald Hazelton NPPES

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

WILLIAM DONALD HAZELTON (NPI 1255258521) is an individual medical genetics, ph.d. medical genetics provider in Seattle, Washington and active in the NPI registry since June 2026.

NPPES Registry Identity

NPI1255258521
Entity TypeIndividualMale
Primary Taxonomy170100000X
Provider Legal NameWILLIAM DONALD HAZELTON
Location Address1100 FAIRVIEW AVE NSeattle, WA 98109-4433
Mailing Address1100 Fairview Ave NSeattle, WA 98109-4433 · (206) 293-1921
Phone(206) 293-1921
Sole ProprietorNo
Enumeration DateJune 30, 2026
NPPES CertifiedJune 30, 2026
✔ NPI 1255258521 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyMedical Genetics, Ph.D. Medical GeneticsOther Service Providers
Taxonomy Code170100000X
Definition
A medical geneticist works in association with a medical specialist, is affiliated with a clinical genetics program, and serves as a consultant to medical and dental specialists.
1100 FAIRVIEW AVE N, Seattle, WA 98109
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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.

TIFFANY TAM PHARMD
Pharmacist (Oncology)
1100 FAIRVIEW AVE N
SEATTLE, WA 98109
King County (206) 667-5000
MICHAEL J BOECKH MD
Internal Medicine (Infectious Disease)
1100 FAIRVIEW AVE N
SEATTLE, WA 98109
King County (206) 667-4898
PREMISE HEALTH OF WASHINGTON MEDICAL PC
Clinic/Center (Multi-Specialty)
1100 FAIRVIEW AVE N
SEATTLE, WA 98109
King County (206) 667-3000
SARAH KATHRYN MORRIS ARNP
Nurse Practitioner (Pediatrics)
1100 FAIRVIEW AVE N
SEATTLE, WA 98109
King County (206) 667-5000
SOHEIL MESHINCHI MD,PHD
Pediatrics (Pediatric Hematology-Oncology)
1100 FAIRVIEW AVE N, BOX 358080 - D4-100
SEATTLE, WA 98109
King County (206) 667-4077
STEPHANIE BRENER
Internal Medicine (Hematology & Oncology)
1100 FAIRVIEW AVE N
SEATTLE, WA 98109
King County (206) 606-1209
FELECITY ESTRELLA PHARMD
Pharmacist (Oncology)
1100 FAIRVIEW AVE N
SEATTLE, WA 98109
King County (206) 495-7056
ERIC PIERRE JOHNSON
Physician Assistant
1100 FAIRVIEW AVE N
SEATTLE, WA 98109
King County (206) 667-5000

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 William Hazelton's NPI number?

The NPI number for William Hazelton is 1255258521. It was assigned to this individual provider in the NPPES registry on June 30, 2026.

Where is William Hazelton located?

William Hazelton practices at 1100 Fairview Ave N, Seattle, WA 98109. The listed phone number is (206) 293-1921.

What is William Hazelton's specialty?

The primary specialty registered for this NPI is Medical Genetics, Ph.D. Medical Genetics with taxonomy code 170100000X.

When was this NPI record last updated?

The NPPES record for William Hazelton was last updated on June 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 54 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.