DR. WILLIAM TOAN NGUYEN (M.D.) – Allergy & Immunology Physician, NPI 1861445017
Allergy & Immunology Physician
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Profile Insights
NPPES metrics only — not quality of care.
94 ALLERGY/IMMUNOLOGY in WA
Provider Addresses for DR. WILLIAM TOAN NGUYEN (M.D.)
9725 3RD AVE NE STE 500
SEATTLE, WA 981152024
Phone: (206) 527-1200
Type: Mailing
8301 161ST AVE NE STE 308
REDMOND, WA 980523858
Phone: (206) 527-1200
Type: Location
125 16TH AVE E
SEATTLE, WA 981125211
Phone: (206) 326-3000
Fax: (206) 326-2785
Type: Mailing
Box Street, Port Charlotte, Charlotte County, Florida, 33948, United States
CHARLOTTE, NC 282603725
Phone: (828) 575-2625
Fax: (828) 350-2174
Type: Mailing
760, North Shiloh Road, Garland, Dallas County, Texas, 75042, United States
GARLAND, TX 750425714
Phone: (972) 272-4463
Fax: (972) 272-7137
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 154 Open Payments records for all available years, with a total value of $18,758.
Total Amount is formed as General ($18,758) + Research ($0) + Ownership ($0) = $18,758.
Last reported payment date: 2024-12-19 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($16,396).
Total Amount
$18,758
General + Research + Ownership
Payments
154
Total payment records
General Amount
$18,758
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AstraZeneca Pharmaceuticals LP | $16,396 |
| GENZYME CORPORATION | $507 |
| Regeneron Healthcare Solutions, Inc. | $349 |
| Takeda Pharmaceuticals U.S.A., Inc. | $339 |
| ALK-Abello, Inc | $125 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2022-03-29
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20220329001148 | I | Allergy/Immunology | WA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| J2357 | Injection, omalizumab, 5 mg | 5,745 | 34 | $0 |
| 95004 | Test for allergy using allergenic extract | 663 | 28 | $0 |
| 95165 | Professional service for preparation and provision of 1 or more antigens | 385 | 31 | $0 |
| 96372 | Injection of drug or substance under skin or into muscle | 231 | 44 | $0 |
| 95117 | Professional service for multiple injections of allergen | 109 | 42 | $0 |
Insurance plans in this area (ZIP 98115)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | WA | |
| A L L E R G Y/ I M M U N O L O G Y | WA | |
| Allergy/Immunology, Pediatric Medicine | WA | |
| - | WA | |
| - | WA | |
| - | WA | |
| - | WA | |
| Nurse Practitioner | WA | |
| - | WA | |
| - | WA |
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