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OLATUNDUN OLADAYO WILLIAMS M.D.
NPI 1598082174
Pediatrics - Pediatric Hematology-Oncology in Seattle, WA

Active since April 22, 2010PECOS Enrolled
100/100
CMS Quality Rating
825 EASTLAKE AVE E, SEATTLE, WA 98109(206) 520-5000 Get Directions Write a Review

NPPES record last updated: January 29, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Olatundun Oladayo Williams M.d. NPPES

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

OLATUNDUN OLADAYO WILLIAMS M.D. (NPI 1598082174) is an individual pediatric hematology-oncology provider in Seattle, Washington, licensed in Washington (MD61622255) and active in the NPI registry since April 2010. She is enrolled in Medicare PECOS and maintains a secondary practice location in New York.

NPPES Registry Identity

NPI1598082174
Entity TypeIndividualFemale
Primary Taxonomy2080P0207X
Provider Legal NameOLATUNDUN OLADAYO WILLIAMSCredential: M.D.
Location Address825 EASTLAKE AVE ESeattle, WA 98109-4405
Mailing AddressPo Box 50095Seattle, WA 98145-5095 · (206) 520-5700
Phone(206) 520-5000
Sole ProprietorNo
Enumeration DateApril 22, 2010
Last NPPES UpdateJanuary 29, 2025
NPPES CertifiedJanuary 29, 2025
✔ NPI 1598082174 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric Hematology-OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0207X
Licenses✔ Licensed in WA · MD61622255✔ Licensed in IL · 036.133875✔ Licensed in NY · 314573
Definition
A pediatrician trained in the combination of pediatrics, hematology and oncology to recognize and manage pediatric blood disorders and cancerous diseases.
825 EASTLAKE AVE E, Seattle, WA 98109
Open in Google Maps ↗

Secondary Practice Location 1

Location 13959 BroadwayNew York, NY 10032-1559 · Phone (212) 305-5437

Accepted Insurance

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

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Olatundun Oladayo Williams M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Olatundun Williams reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Association Of University Physicians
1.5 mi
Anesthesiology
701 5TH AVE, SUITE 700
Seattle, WA 98104
  • Reassigned Medicare billing, Washington enrollment
  • 4,364 clinicians in this Medicare group
NPI 1023041159 (206) 543-6420
Association Of Chmc And University Physicians
1.6 mi
Orthopaedic Trauma
325 9TH AVE
Seattle, WA 98104
  • Reassigned Medicare billing, Washington enrollment
  • Medicare enrollment name: The Association Of Chrmc And University Physicians
  • 1,443 clinicians in this Medicare group
NPI 1215153671 (206) 731-3000
Trustees Of Columbia University In The City Of New York
2,407 mi
Surgery
622 W 168TH ST
New York, NY 10032
  • Reassigned Medicare billing, New York enrollment
  • 3,922 clinicians in this Medicare group
NPI 1508266347 (646) 317-7111

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

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

100/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality86.8
Promoting Interoperability100
Improvement Activities40

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.

SANDHYA RAMANATHAN PANCH M.D.
Internal Medicine (Hematology)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5000
AFSHIN SHAMELI MD, PHD
Pathology (Anatomic Pathology & Clinical Pathology)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5000
MELISSA YEN-CHING LO DNP, ARNP
Nurse Practitioner (Pediatrics)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 861-3396
VYSHAK ALVA VENUR M.D
Internal Medicine (Medical Oncology)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5700
COURTNEY JO SANDERSON
Physician Assistant
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 288-1000
DR. EMILY NORPELL PALMQUIST M.D.
Surgery
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5000
KAITLIN ELIZABETH VERNI
Physician Assistant
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 288-1000
MIKHAILA CICELY MARECKI ARNP
Nurse Practitioner (Women's Health)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5000

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 Olatundun Williams's NPI number?

The NPI number for Olatundun Williams is 1598082174. It was assigned to this individual provider in the NPPES registry on April 22, 2010.

Where is Olatundun Williams located?

Olatundun Williams practices at 825 Eastlake Ave E, Seattle, WA 98109. The listed phone number is (206) 520-5000.

What is Olatundun Williams's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.

Is Olatundun Williams enrolled in Medicare?

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

Which organizations bill Medicare for Olatundun Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Olatundun Williams reassigns Medicare benefits to 3 organizations: The Association Of University Physicians (Seattle, WA), Association Of Chmc And University Physicians (Seattle, WA) and Trustees Of Columbia University In The City Of New York (New York, NY). Each 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 Olatundun Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Olatundun Williams accept?

Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Olatundun 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 Olatundun Williams was last updated on January 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months 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.