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Compare the published Medicare service mix of Mark Gerard O'callaghan, M.D. with clinicians in the same registry specialty: Diagnostic Radiology (CMS).

WA · Exact areaEdit location

2024 published service data · 27 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Elizabeth Jo Hayes, MD

Diagnostic Radiology (CMS) · Lynnwood, WA

Shared published services
1 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
38%Service-mix similarityView profile →

Robert Paul Deconde, M.D.

Diagnostic Radiology (CMS) · Seattle, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
30%Service-mix similarityView profile →

David Jin-Woo Chang, MD

Diagnostic Radiology (CMS) · Vancouver, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
30%Service-mix similarityView profile →

Richard Nguyen, MD

Diagnostic Radiology (CMS) · Richland, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
28%Service-mix similarityView profile →

Timothy Leigh Larson, MD

Diagnostic Radiology (CMS) · Lynnwood, WA

Shared published services
1 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
27%Service-mix similarityView profile →

Lawrence Hayes Rose, MD

Diagnostic Radiology (CMS) · Vancouver, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
25%Service-mix similarityView profile →

Harrison Patrick March, MD

Diagnostic Radiology (CMS) · Lynnwood, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
24%Service-mix similarityView profile →

Danial K Hallam

Diagnostic Radiology · Radiation Oncology (CMS) · Seattle, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
24%Service-mix similarityView profile →

Kenneth John Hebert, MD

Diagnostic Radiology (CMS) · Lynnwood, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
24%Service-mix similarityView profile →

Mitchell Patrick Kok, MD

Diagnostic Radiology (CMS) · Olympia, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
23%Service-mix similarityView profile →

Kelley Lynn Cline, MD

Diagnostic Radiology (CMS) · Seattle, WA

Shared published services
2 shared services · view billing descriptions
  • X-ray of lower and sacral spine, 2-3 views (72100)
  • X-ray of chest, 2 views (71046)
23%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.