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Compare the published Medicare service mix of Karl Greer, MD with clinicians in the same registry specialty: Family Medicine.

ROHNERT PARK, 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 · 53 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Robert Isaacs, MD

Family Medicine · Santa Rosa, CA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
80%Service-mix similarity~7.6 milesView profile →

James Jerome Wu, MD

Family Medicine · Petaluma, CA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
64%Service-mix similarity~7.8 milesView profile →

Douglas Jimenez, M.D.

Family Medicine · Santa Rosa, CA

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
64%Service-mix similarity~7.6 milesView profile →

Christopher Robertson Nyland, MD

Family Medicine · Santa Rosa, CA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
48%Service-mix similarity~6.8 milesView profile →

Ashmi Shyam Ullal

Family Medicine · Santa Rosa, CA

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
38%Service-mix similarity~6.9 milesView profile →

Jennifer Devries, MD, MPH

Family Medicine · Santa Rosa, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
36%Service-mix similarity~5.0 milesView profile →

Jeannette Barbarella Currie, M.D.

Family Medicine · Santa Rosa, CA

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
34%Service-mix similarity~6.9 milesView profile →

Briga Inanna Mullin, MD

Family Medicine · Santa Rosa, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
28%Service-mix similarity~7.6 milesView profile →

Lawrence Kaiqi Hou, DO

Family Medicine · Petaluma, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
22%Service-mix similarity~7.8 milesView profile →

Jan O Sonander, MD

Family Medicine · Santa Rosa, CA

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
13%Service-mix similarity~6.9 milesView profile →

James Francis Leoni, M.D.

Family Medicine · Petaluma, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
9%Service-mix similarity~7.8 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.