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Compare the published Medicare service mix of Kathryn Marie O'brien with clinicians in the same registry specialty: Physician Assistant.

NJ · Exact areaEdit location

2024 published service data · 500 eligible profiles compared. This search reached its 500-profile comparison limit, using NPI order. Narrow the location for a more focused comparison. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Dara Blum Facciani, PA-C

Physician Assistant · West Orange, NJ

Shared published services
2 shared services · view billing descriptions
  • Shaving of part of shoulder bone and repair of ligament using an endoscope (29826)
  • Repair of shoulder rotator cuff using an endoscope (29827)
47%Service-mix similarityView profile →

Logan Barnes, PA-C

Physician Assistant · Ewing, NJ

Shared published services
3 shared services · view billing descriptions
  • Prosthetic repair of shoulder joint, total shoulder (23472)
  • Shaving of part of shoulder bone and repair of ligament using an endoscope (29826)
  • Repair of shoulder rotator cuff using an endoscope (29827)
41%Service-mix similarityView profile →

Alexandra Gaudio, PA-C

Physician Assistant · Princeton, NJ

Shared published services
1 shared services · view billing descriptions
  • Replacement of knee joint, both sides of knee (27447)
40%Service-mix similarityView profile →

Christopher Glenn Schwizer, PA-C

Physician Assistant · Princeton, NJ

Shared published services
3 shared services · view billing descriptions
  • Replacement of knee joint, both sides of knee (27447)
  • Shaving of part of shoulder bone and repair of ligament using an endoscope (29826)
  • Repair of shoulder rotator cuff using an endoscope (29827)
32%Service-mix similarityView profile →

Jennifer R. Otlowski, PA-C

Physician Assistant · Edison, NJ

Shared published services
1 shared services · view billing descriptions
  • Replacement of knee joint, both sides of knee (27447)
30%Service-mix similarityView profile →

Amanda Defeo, PA

Physician Assistant · Paramus, NJ

Shared published services
3 shared services · view billing descriptions
  • Prosthetic repair of shoulder joint, total shoulder (23472)
  • Shaving of part of shoulder bone and repair of ligament using an endoscope (29826)
  • Repair of shoulder rotator cuff using an endoscope (29827)
30%Service-mix similarityView profile →

Clay Johnson

Physician Assistant · Flemington, NJ

Shared published services
1 shared services · view billing descriptions
  • Replacement of knee joint, both sides of knee (27447)
28%Service-mix similarityView profile →

Diana C. Zury, PA-C

Physician Assistant · Ridgewood, NJ

Shared published services
1 shared services · view billing descriptions
  • Replacement of knee joint, both sides of knee (27447)
28%Service-mix similarityView profile →

Alexander Bull, PA-C

Physician Assistant · Clark, NJ

Shared published services
1 shared services · view billing descriptions
  • Replacement of knee joint, both sides of knee (27447)
27%Service-mix similarityView profile →

Brittany Morales, PA-C

Physician Assistant · Englewood Cliffs, NJ

Shared published services
1 shared services · view billing descriptions
  • Replacement of knee joint, both sides of knee (27447)
26%Service-mix similarityView profile →

Nickolas Auleta, PA-C

Physician Assistant · Somers Point, NJ

Shared published services
1 shared services · view billing descriptions
  • Replacement of knee joint, both sides of knee (27447)
25%Service-mix similarityView 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 NPI 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.