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Compare the published Medicare service mix of John Nicholas Diana, M.D. with clinicians in the same registry specialty: Orthopedic Surgery (CMS).

CA · Exact areaEdit location

2024 published service data · 82 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Geoffrey Rohlfing

Orthopedic Surgery (CMS) · Fresno, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
88%Service-mix similarityView profile →

Ryan E Moore, MD

Orthopedic Surgery (CMS) · Saint Helena, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
88%Service-mix similarityView profile →

Johan Martin Forslund, MD

Orthopedic Surgery (CMS) · Fullerton, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
88%Service-mix similarityView profile →

Joseph Eric Koressel, MD

Orthopedic Surgery (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
85%Service-mix similarityView profile →

Ghassan E. Boghosian, DO

Orthopedic Surgery (CMS) · Rancho Mirage, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
84%Service-mix similarityView profile →

Nirav Jayprakash Shah, MD

Orthopedic Surgery (CMS) · Tarzana, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
83%Service-mix similarityView profile →

Peter Elsissy, M.D.

Orthopedic Surgery (CMS) · Redlands, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
82%Service-mix similarityView profile →

Liam Christian Bosch, MD

Orthopedic Surgery (CMS) · Redwood City, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
82%Service-mix similarityView profile →

Shafagh Monazzam, MD

Orthopedic Surgery (CMS) · South Gate, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
81%Service-mix similarityView profile →

Harbinder S Chadha, M.D.

Orthopedic Surgery (CMS) · Chula Vista, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
80%Service-mix similarityView profile →

Todd B Dietrick, M.D.

Orthopedic Surgery (CMS) · Pasadena, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
80%Service-mix similarityView profile →

Matthew Siljander, MD

Specialty details in registry · Newport Beach, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of knee, 4 or more views (73564)
  • X-ray of hip, 2-3 views (73502)
  • X-ray of knee, 3 views (73562)
79%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.