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Compare the published Medicare service mix of Robert C. Hsieh, M.D. with clinicians in the same registry specialty: Ophthalmology (CMS).

RIVERDALE, MD · 10 milesEdit location
Within 10 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 24 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Andrew I. Engel, M.D.

Obstetrics/Gynecology (CMS) · Washington, DC

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
21%Service-mix similarity~7.9 milesView profile →

Quan Wang, M.D.

Internal Medicine · Nephrology (CMS) · Greenbelt, MD

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
14%Service-mix similarity~7.1 milesView profile →

Olumuyiwa A Paul, MD

Orthopedic Surgery (CMS) · Glenn Dale, MD

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
13%Service-mix similarity~7.4 milesView profile →

Xiaoyan Wang, M.D.

Hematology/Oncology · Internal Medicine (CMS) · Greenbelt, MD

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
13%Service-mix similarity~7.1 milesView profile →

Anita Vaughn, MD

Specialty details in registry · Clinton, MD

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
12%Service-mix similarity~9.8 milesView profile →

Bijan Bahmanyar, M.D., F.A.C.S.

General Practice (CMS) · Greenbelt, MD

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
12%Service-mix similarity~7.1 milesView profile →

Fayaz A Shawl, M.D.

Cardiac Surgery · Cardiovascular Disease (Cardiology) (CMS) · Takoma Park, MD

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
10%Service-mix similarity~8.2 milesView profile →

Neena Bhatti, M.D.

Allergy/Immunology (CMS) · Upper Marlboro, MD

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
9%Service-mix similarity~6.7 milesView profile →

Stephanie S. Jacobs, M.D.

Cardiovascular Disease (Cardiology) (CMS) · Washington, DC

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
7%Service-mix similarity~7.7 milesView profile →

Kenneth M.h. Lee, M.D.

Cardiovascular Disease (Cardiology) · Interventional Cardiology (CMS) · Washington, DC

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
4%Service-mix similarity~8.0 milesView 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 approximate distance 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.