A DIFFERENT WAY TO EXPLORE

Similar work.
More providers to explore.

Compare the published Medicare service mix of Saif Haq Siddiqi, M.D. with clinicians in the same registry specialty: Diagnostic Radiology (CMS).

SANTA ANA, CA · Exact areaEdit location

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

Patricia Kay Kincaid, M.D.

Diagnostic Radiology (CMS) · Santa Ana, 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)
  • Ct scan of abdomen and pelvis with contrast (74177)
74%Service-mix similarityView profile →

Maurice Yu, M.D.

Diagnostic Radiology · Interventional Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • X-ray of abdomen, 1 view (74018)
  • X-ray of chest, 2 views (71046)
39%Service-mix similarityView profile →

Michael David Brown, D.O.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • Ct scan of chest without contrast (71250)
  • X-ray of shoulder, minimum of 2 views (73030)
35%Service-mix similarityView profile →

Christina Ma, M.D.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Ct scan of abdomen and pelvis with contrast (74177)
  • Ct scan of abdomen and pelvis without contrast (74176)
  • Ct scan of chest without contrast (71250)
32%Service-mix similarityView profile →

Glenda Lee Romero-Urquhart, M.D.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Ct scan head or brain without contrast (70450)
  • X-ray of chest, 2 views (71046)
  • Ct scan of chest without contrast (71250)
32%Service-mix similarityView profile →

Mark Geoffery Stein, M.D.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 1 view (71045)
  • X-ray of chest, 2 views (71046)
  • Ct scan of chest without contrast (71250)
29%Service-mix similarityView profile →

Joseph John Brugman, M.D.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • Ct scan of chest without contrast (71250)
  • X-ray of shoulder, minimum of 2 views (73030)
23%Service-mix similarityView profile →

Laszlo Phillip Kaveggia, M.D.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of shoulder, minimum of 2 views (73030)
  • X-ray of knee, 3 views (73562)
20%Service-mix similarityView profile →

David Leonard Rodibaugh, M.D.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • Ct scan of chest without contrast (71250)
  • Mri scan of brain without contrast (70551)
15%Service-mix similarityView profile →

Jessica Langer, MD

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Limited ultrasound scan of abdomen (76705)
  • Complete ultrasound scan behind abdominal cavity (76770)
  • Complete ultrasound scan of abdomen (76700)
10%Service-mix similarityView profile →

Martin W. Wieler, M.D.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
1 shared services · view billing descriptions
  • Mri scan of brain without contrast (70551)
5%Service-mix similarityView profile →

Duke Nguyen, M.D.

Diagnostic Radiology (CMS) · Santa Ana, CA

Shared published services
1 shared services · view billing descriptions
  • Ct scan of chest without contrast (71250)
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.