NPPES file of Aug 9, 2026

Alexander Si Nguyen, M.D.

Pain Medicine (Anesthesiology) Physician · Seattle, WA

Alexander Si Nguyen, M.D. is a pain medicine (anesthesiology) physician with a practice address in Seattle, Washington, and NPI 1487186581, issued on Mar 29, 2017. Check the license on the Washington Medical Commission; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1487186581
Name
Alexander Si Nguyen
Credential
M.D.
Primary taxonomy
Pain Medicine (Anesthesiology) Physician 207LP2900X
License numbers
317013-01 NY
036176521 IL
Self-reported in NPPES; status is on the state search
Practice location
925 Seneca Street, Seattle, WA 98101
Phone
(206) 583-6079
Enumerated
Mar 29, 2017
Record last updated
Aug 21, 2025
Medicare enrollment
Enrolled (PECOS I20251129000612); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest pain medicine (anesthesiology) physician records → All 106 in Washington → Look up another NPI →

Also registered at 925 Seneca Street

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Meredith JohnsonStudent in an Organized Health Care Education/Training Program1548721194
  2. Katherine McManus, PHARMDPharmacist1447725858
  3. Baoanh Vu, MDStudent in an Organized Health Care Education/Training Program1871289686

Verify Alexander Si Nguyen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWashington Medical CommissionCheck the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Washington license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through 2 group practices

  1. New York UniversityNew York, NY
  2. Spectrum Health Primary Care PartnersGrand Rapids, MI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Alexander Si Nguyen among 106 pain medicine (anesthesiology) physician records in Washington

Alexander Si Nguyen, M.D. is one of 106 pain medicine (anesthesiology) physician records with a practice address in Washington. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 90% of them.

  • NPI issued2017 · 90% of these records are older, 7% newer
  • In a Medicare fileYes · 78% of these records are
  • In the CMS Doctors and Clinicians fileYes · 67% of these records are
  • Graduated2017 · median 2006 among the 71 with a school on file
  • Record last updated2025 · 57% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207LP2900X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Pain Medicine (Anesthesiology) Physician providers in Washington

There are 106 pain medicine (anesthesiology) physician records in Washington.

All 106 in Washington → Every provider in Seattle → Pain Medicine (Anesthesiology) Physician nationwide →

The 8 pain medicine (anesthesiology) physician records with the nearest ZIP codes

  1. Jane Ballantyne, MDSeattle, WA 981041306837232
  2. Yian Chen, M.D.Seattle, WA 981041235497306
  3. Sheila Chiu, DOSeattle, WA 981041730388570
  4. William EdwardsSeattle, WA 981041720145931
  5. Andreas Grabinsky, MDSeattle, WA 981041548226855
  6. Ivan Lesnik, M.D.Seattle, WA 981041487617346
  7. Katherin Peperzak, M.D.Seattle, WA 981041588891139
  8. Jordan Starr, M.D.Seattle, WA 981041710373089

Common questions

What is Alexander Si Nguyen, M.D.'s NPI number?

Alexander Si Nguyen, M.D.'s National Provider Identifier (NPI) is 1487186581, issued on Mar 29, 2017. An NPI identifies a provider in billing; it is not a license.

Where is Alexander Si Nguyen, M.D. located?

The NPPES record lists a practice address at 925 Seneca Street, Seattle, WA, 98101. Phone: (206) 583-6079. Providers update this record themselves, so call before visiting.

How can I verify Alexander Si Nguyen, M.D.'s license?

Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.