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Compare the published Medicare service mix of Naum Spiegel, MD with clinicians in the same registry specialty: Urology (CMS).

UKIAH, CA · 100 milesEdit location
Within 100 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 · 30 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Benjamin C Dudley, MD

Urology (CMS) · Petaluma, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
70%Service-mix similarity~69.9 milesView profile →

Rhunjay James Yu, M.D.

Urology (CMS) · Greenbrae, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
68%Service-mix similarity~90.7 milesView profile →

Robert James, M.D.

Specialty details in registry · Santa Rosa, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
66%Service-mix similarity~55.8 milesView profile →

Patrick Fisher, MD

Urology (CMS) · Vacaville, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
66%Service-mix similarity~87.1 milesView profile →

Joyce Ann Loeffler, MD

Specialty details in registry · Woodland, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
66%Service-mix similarity~81.6 milesView profile →

Ahmed Alghrouz, MD

Urology (CMS) · Yuba City, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
63%Service-mix similarity~84.5 milesView profile →

Herkanwal S. Khaira, MD

Urology (CMS) · Fairfield, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
63%Service-mix similarity~87.6 milesView profile →

Patrick Mulvey Bennett, M.D.

Urology (CMS) · Greenbrae, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
63%Service-mix similarity~90.7 milesView profile →

Thomas Duckett, M.D.

Specialty details in registry · Santa Rosa, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
62%Service-mix similarity~56.9 milesView profile →

Harry Neuwirth, M.D.

Urology (CMS) · Greenbrae, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
60%Service-mix similarity~90.7 milesView profile →

Kathryn F Sullivan, MD

Urology (CMS) · Travis Afb, CA

Shared published services
3 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)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
60%Service-mix similarity~90.8 milesView profile →

Allison Sue Glass, M.D.

Urology (CMS) · Woodland, 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)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Diagnostic exam of bladder and urethra using an endoscope (52000)
60%Service-mix similarity~81.6 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.