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Compare the published Medicare service mix of Michael J. Alexander, M.D. with clinicians in the same registry specialty: Interventional Radiology · Neurosurgery (CMS).

LOS ANGELES, CA · Exact areaEdit location

2024 published service data · 44 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

William Jacob Mack, M.D.

Diagnostic Radiology · Neurosurgery (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)
  • Imaging of blood vessel (75898)
  • Insertion of tube into brain artery for diagnosis or treatment with review by radiologist (36226)
60%Service-mix similarityView profile →

Geoffrey P. Colby, M.D., PH.D.

Neurosurgery (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)
  • Imaging of blood vessel (75898)
  • Insertion of tube into brain artery for diagnosis or treatment with review by radiologist (36226)
56%Service-mix similarityView profile →

Tyler Scott Cole, MD

Neurosurgery (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)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • Imaging of blood vessel (75898)
54%Service-mix similarityView profile →

Thomas C. Chen, M.D., PHD

Neurosurgery (CMS) · Los Angeles, 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)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
43%Service-mix similarityView profile →

Darrin J. Lee, MD

Neurosurgery (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)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
41%Service-mix similarityView profile →

Adam Mamelak, MD

Neurosurgery (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)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
39%Service-mix similarityView profile →

Patrick C Hsieh, MD

Neurosurgery (CMS) · Los Angeles, 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)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
34%Service-mix similarityView profile →

Moise Danielpour, M.D.

Neurosurgery (CMS) · Los Angeles, CA

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)
31%Service-mix similarityView profile →

Albert Wong, M.D.

Neurosurgery (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)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
30%Service-mix similarityView profile →

Alexander Tuchman, M.D.

Neurosurgery (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)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
30%Service-mix similarityView profile →

Charles Yu Liu, M.D., PHD

Neurosurgery (CMS) · Los Angeles, 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)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
28%Service-mix similarityView profile →

Martin Cooper, M.D.

Specialty details in registry · Los Angeles, CA

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)
26%Service-mix similarityView 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 NPI 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.