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Compare the published Medicare service mix of David Thor Johnson, MD PHD with clinicians in the same registry specialty: Diagnostic Radiology · Interventional Radiology (CMS).

AURORA, CO · Exact areaEdit location

2024 published service data · 12 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Blaze Cook, MD

Diagnostic Radiology · Interventional Radiology · Radiation Oncology (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan head or brain without contrast (70450)
  • X-ray of abdomen, 1 view (74018)
65%Service-mix similarityView profile →

George Zlotchenko, M.D.

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • X-ray of abdomen, 1 view (74018)
  • Ct scan of abdomen and pelvis with contrast (74177)
32%Service-mix similarityView profile →

Lisa Walker, MD

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine · Pediatric Medicine (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ultrasound of both sides of head and neck blood flow (93880)
29%Service-mix similarityView profile →

Francis Kang, M.D.

Diagnostic Radiology · Interventional Radiology (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of chest without contrast (71250)
23%Service-mix similarityView profile →

Kimi L. Kondo, DO

Diagnostic Radiology · Interventional Radiology (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for needle placement (76942)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Ct scan of blood vessels of abdomen and pelvis with contrast (74174)
20%Service-mix similarityView profile →

Katherine Marchak, M.D.

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for needle placement (76942)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Ct scan of blood vessels of abdomen and pelvis with contrast (74174)
19%Service-mix similarityView profile →

Robert Ryu, MD

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for needle placement (76942)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Ct scan of blood vessels of abdomen and pelvis with contrast (74174)
16%Service-mix similarityView profile →

Eduardo Andres Bent Robinson, MD

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for needle placement (76942)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Ct scan of blood vessels of abdomen and pelvis with contrast (74174)
16%Service-mix similarityView profile →

Leigh C Casadaban, MD

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for needle placement (76942)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Ct scan of blood vessels of abdomen and pelvis with contrast (74174)
14%Service-mix similarityView profile →

Premal S Trivedi, MD, MSE

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine (CMS) · Aurora, CO

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for needle placement (76942)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Ct scan of blood vessels of abdomen and pelvis with contrast (74174)
14%Service-mix similarityView profile →

Jonathan David Lindquist, M.D.

Diagnostic Radiology · Interventional Radiology · Nuclear Medicine (CMS) · Aurora, CO

Shared published services
2 shared services · view billing descriptions
  • Ultrasonic guidance for needle placement (76942)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
11%Service-mix similarityView profile →

Gordon Mclennan, MD

Diagnostic Radiology (CMS) · Aurora, CO

Shared published services
1 shared services · view billing descriptions
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
3%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.