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Compare the published Medicare service mix of Fangxiang Chen, M.D. with clinicians in the same registry specialty: Neurosurgery (CMS).

SAINT LOUIS, MO · Exact areaEdit location

2024 published service data · 42 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Bhuvic Patel, MD

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
73%Service-mix similarityView profile →

Paul Santiago, MD

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
60%Service-mix similarityView profile →

Peter Sylvester

Neurology (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • 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 a high level of medical decision making, if using time, 60 minutes or more (99205)
54%Service-mix similarityView profile →

Joanna Marie Kemp, M.D.

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
53%Service-mix similarityView profile →

Bassam Ar Hadi, M.D

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
52%Service-mix similarityView profile →

Terrence Fletcher Holekamp, M.D., PH.D.

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
50%Service-mix similarityView profile →

Dimitrios Mathios, MD

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • 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 a high level of medical decision making, if using time, 60 minutes or more (99205)
49%Service-mix similarityView profile →

Albert Hong-Jae Kim, MD

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
37%Service-mix similarityView profile →

Ananth Kesav Vellimana, MD

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
37%Service-mix similarityView profile →

Alex Patrick Michael, MD

Neurology · Neurosurgery (CMS) · Saint Louis, MO

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
35%Service-mix similarityView profile →

Tanya M Quinn, M.D.

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
2 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
35%Service-mix similarityView profile →

Mauricio Jose Avila Guerra, M.D.

Neurosurgery (CMS) · Saint Louis, MO

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
28%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.