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Similar work.
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Compare the published Medicare service mix of David J. Tuttle, MD with clinicians in the same registry specialty: Diagnostic Radiology (CMS).

CA · 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.

Nathan C Hawkes

Diagnostic Radiology (CMS) · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
88%Service-mix similarityView profile →

Kevin Lee Junus, DO

Diagnostic Radiology (CMS) · Novato, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
88%Service-mix similarityView profile →

Charles Franklin Brown, M.D.

Diagnostic Radiology (CMS) · Long Beach, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
87%Service-mix similarityView profile →

Chul Young Chung, M.D.

Diagnostic Radiology (CMS) · Walnut Creek, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
86%Service-mix similarityView profile →

Alexander Cheng-Kang Guo, M.D.

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine (CMS) · Placerville, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
85%Service-mix similarityView profile →

Jacob R Wouden, M.D.

Diagnostic Radiology (CMS) · Fremont, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
85%Service-mix similarityView profile →

Adam Keenan Meeks, M.D.

Diagnostic Radiology (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
85%Service-mix similarityView profile →

Leonard Peter Holmgren, MD

Diagnostic Radiology (CMS) · S Lake Tahoe, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
85%Service-mix similarityView profile →

David Toshio Nakamura, M.D.

Diagnostic Radiology (CMS) · Folsom, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
85%Service-mix similarityView profile →

Flora Stepansky, M.D.

Diagnostic Radiology (CMS) · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
84%Service-mix similarityView profile →

Sean Henry Novak, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
84%Service-mix similarityView profile →

Barry D Klein, MD

Diagnostic Radiology (CMS) · Thousand Oaks, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • Screening mammography (77067)
84%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.