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Compare the published Medicare service mix of William Toan Nguyen, M.D. with clinicians in the same registry specialty: Allergy/Immunology (CMS).

REDMOND, WA · 10 milesEdit location
Within 10 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 13 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Daniel Groth

Allergy/Immunology (CMS) · Seattle, WA

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Injection of drug or substance under skin or into muscle (96372)
  • Professional service for multiple injections of allergen (95117)
97%Service-mix similarity~9.5 milesView profile →

Bani Preet Kaur, M.D.

Allergy/Immunology (CMS) · Seattle, WA

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Injection of drug or substance under skin or into muscle (96372)
  • Professional service for multiple injections of allergen (95117)
96%Service-mix similarity~9.5 milesView profile →

Matthew Perez, MD

Allergy/Immunology (CMS) · Seattle, WA

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Injection of drug or substance under skin or into muscle (96372)
  • Professional service for multiple injections of allergen (95117)
88%Service-mix similarity~9.5 milesView profile →

Sara Seghezzo, M.D.

Allergy/Immunology (CMS) · Seattle, WA

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Injection of drug or substance under skin or into muscle (96372)
  • Professional service for multiple injections of allergen (95117)
86%Service-mix similarity~9.5 milesView profile →

Lisa Christine Winterroth, M.D.

Allergy/Immunology · Pediatric Medicine (CMS) · Seattle, WA

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Injection of drug or substance under skin or into muscle (96372)
  • Professional service for multiple injections of allergen (95117)
84%Service-mix similarity~9.5 milesView profile →

John William Knutson, MD

Allergy/Immunology (CMS) · Bellevue, WA

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for multiple injections of allergen (95117)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
76%Service-mix similarity~6.2 milesView profile →

Kevin T Dooms, MD

Allergy/Immunology (CMS) · Bellevue, WA

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for multiple injections of allergen (95117)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
64%Service-mix similarity~6.2 milesView profile →

Margaret Shin Kim, M.D.

Allergy/Immunology · Internal Medicine (CMS) · Kirkland, WA

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
57%Service-mix similarity~4.5 milesView profile →

Frank S Virant, M.D.

Specialty details in registry · Seattle, WA

Shared published services
3 shared services · view billing descriptions
  • Professional service for multiple injections of allergen (95117)
  • Professional service for single injection of allergen (95115)
  • Administration and interpretation of patient-focused health risk assessment (96160)
57%Service-mix similarity~9.5 milesView profile →

Ashley M Jerath Tatum, M.D.

Specialty details in registry · Seattle, WA

Shared published services
3 shared services · view billing descriptions
  • Injection of drug or substance under skin or into muscle (96372)
  • Administration and interpretation of patient-focused health risk assessment (96160)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
49%Service-mix similarity~9.5 milesView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in approximate distance order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.