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Compare the published Medicare service mix of Cheri Leng, M.D. with clinicians in the same registry specialty: Ophthalmology.

TUALATIN, OR · 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 · 37 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Alan R Bengtzen, MD

Ophthalmology · Oregon City, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
61%Service-mix similarity~9.7 milesView profile →

William Flanary, M.D.

Ophthalmology · Oregon City, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient complete exam of visual system (92004)
60%Service-mix similarity~9.7 milesView profile →

David Sebastian Sanders, MD, MPH

Ophthalmology · Portland, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient complete exam of visual system (92004)
54%Service-mix similarity~8.7 milesView profile →

Ian Danford, MD

Ophthalmology · Oregon City, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient complete exam of visual system (92004)
53%Service-mix similarity~9.7 milesView profile →

Brett Matthew Gudgel, M.D.

Ophthalmology · Oregon City, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient complete exam of visual system (92004)
52%Service-mix similarity~9.7 milesView profile →

Ellen Jean Davis, MD

Ophthalmology · Portland, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient problem focused exam of visual system (92012)
52%Service-mix similarity~9.4 milesView profile →

Seema R Gupta, MD

Ophthalmology · Portland, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Imaging of optic nerve (92133)
50%Service-mix similarity~9.4 milesView profile →

Nisha Nagarkatti-Gude, MD, PHD

Ophthalmology · Lake Oswego, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient complete exam of visual system (92004)
49%Service-mix similarity~3.5 milesView profile →

William D Vandecar, M.D.

Ophthalmology · Lake Oswergo, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient complete exam of visual system (92004)
49%Service-mix similarity~3.5 milesView profile →

Tyler Dallin Boulter, MD

Ophthalmology · Portland, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient complete exam of visual system (92004)
49%Service-mix similarity~8.7 milesView profile →

Martin J Balish, MD

Ophthalmology · Portland, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Imaging of optic nerve (92133)
48%Service-mix similarity~8.7 milesView profile →

Aazim Siddiqui

Ophthalmology · Portland, OR

Shared published services
3 shared services · view billing descriptions
  • Removal of cataract with insertion of prosthetic lens (66984)
  • Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
46%Service-mix similarity~9.4 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.