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Compare the published Medicare service mix of Daniel Ryder Ludwig, MD with clinicians in the same registry specialty: Diagnostic Radiology (CMS).

SAINT LOUIS, MO · Exact areaEdit location

2024 published service data · 276 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Anup Shashindra Shetty, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
93%Service-mix similarityView profile →

David Hilton Ballard, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
93%Service-mix similarityView profile →

Michael Hunter Lanier, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
91%Service-mix similarityView profile →

Benjamin Strnad, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
90%Service-mix similarityView profile →

Cary L Siegel, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
89%Service-mix similarityView profile →

Richard Tsai, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
88%Service-mix similarityView profile →

Katerina Sunn Konstantinoff, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
87%Service-mix similarityView profile →

Mohamed Z Rajput, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
86%Service-mix similarityView profile →

Vincent Michael Mellnick, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
85%Service-mix similarityView profile →

Tyler Jacob Fraum, MD

Diagnostic Radiology · Nuclear Medicine (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
85%Service-mix similarityView profile →

Joseph Edward Ippolito, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
83%Service-mix similarityView profile →

Katharina Feister, MD

Diagnostic Radiology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest with contrast (71260)
83%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.