HCPList Know more before you call. About
A DIFFERENT WAY TO EXPLORE

Similar work.
More providers to explore.

Compare the published Medicare service mix of Yen Hsun Chen, MD with clinicians in the same registry specialty: Hand Surgery · Orthopedic Surgery (CMS).

ALHAMBRA, CA · 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 · 13 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Amir Hossein Mostofi, MD

Hand Surgery · Orthopedic Surgery (CMS) · Pasadena, CA

Shared published services
3 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)
  • X-ray of wrist, minimum of 3 views (73110)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
61%Service-mix similarity~4.8 milesView profile →

Steven David Lin, MD

Hand Surgery · Orthopedic Surgery (CMS) · Arcadia, CA

Shared published services
3 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)
  • Aspiration and/or injection of fluid from large joint (20610)
  • X-ray of wrist, minimum of 3 views (73110)
57%Service-mix similarity~5.0 milesView profile →

Ryan Dellamaggiora, M.D.

Hand Surgery (CMS) · Los Angeles, CA

Shared published services
3 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)
  • Aspiration and/or injection of fluid from large joint (20610)
  • X-ray of wrist, minimum of 3 views (73110)
52%Service-mix similarity~5.4 milesView profile →

Kenneth R Sabbag, M.D.

Hand Surgery · Orthopedic Surgery (CMS) · Pasadena, CA

Shared published services
3 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)
  • X-ray of wrist, minimum of 3 views (73110)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
51%Service-mix similarity~3.6 milesView profile →

Annette Billings, MD

Hand Surgery · Orthopedic Surgery (CMS) · Los Angeles, CA

Shared published services
3 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)
  • X-ray of wrist, minimum of 3 views (73110)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
44%Service-mix similarity~8.2 milesView profile →

Ali Azad, MD

Hand Surgery · Orthopedic Surgery (CMS) · Los Angeles, CA

Shared published services
3 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)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Injection into tendon or ligament (20550)
43%Service-mix similarity~5.4 milesView profile →

Christophe S Lee, M.D.

Hand Surgery · Orthopedic Surgery (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of wrist, minimum of 3 views (73110)
  • Injection into tendon or ligament (20550)
  • X-ray of hand, minimum of 3 views (73130)
42%Service-mix similarity~9.7 milesView profile →

Mary Ann Bos, DO

Orthopedic Surgery (CMS) · Downey, CA

Shared published services
3 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)
  • X-ray of hand, minimum of 3 views (73130)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
41%Service-mix similarity~9.2 milesView profile →

Milan Stevanovic, M.D.

Hand Surgery · Orthopedic Surgery · Plastic And Reconstructive Surgery (CMS) · Los Angeles, CA

Shared published services
3 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)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
30%Service-mix similarity~5.4 milesView profile →

Luke Nicholson, M.D.

Hand Surgery · Orthopedic Surgery (CMS) · Los Angeles, CA

Shared published services
3 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)
  • Injection into tendon or ligament (20550)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
29%Service-mix similarity~5.4 milesView profile →

Roy J Caputo, M.D.

Hand Surgery · Orthopedic Surgery (CMS) · Downey, CA

Shared published services
2 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
23%Service-mix similarity~9.2 milesView profile →

Jean Ding, M.D.

Hand Surgery · Orthopedic Surgery (CMS) · Arcadia, CA

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
13%Service-mix similarity~6.6 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.