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Compare the published Medicare service mix of John David Nerva, MD with clinicians in the same registry specialty: Neurosurgery (CMS).

GLENDALE, AZ · 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 · 24 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Aristotelis Filippidis, M.D., PH.D.

Neurosurgery (CMS) · Phoenix, AZ

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)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
43%Service-mix similarity~8.0 milesView profile →

Lee Hwang, MD

Neurosurgery (CMS) · Phoenix, AZ

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)
30%Service-mix similarity~9.4 milesView profile →

Anna Lea Huguenard, MD

Neurosurgery (CMS) · Phoenix, AZ

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)
25%Service-mix similarity~8.0 milesView profile →

Michael Joseph Lang, M.D.

Neurosurgery (CMS) · Phoenix, AZ

Shared published services
2 shared services · view billing descriptions
  • Insertion of tube into intracranial artery for diagnosis or treatment with review by radiologist (36223)
  • Insertion of tube into external neck artery for diagnosis or treatment with review by radiologist (36227)
24%Service-mix similarity~8.0 milesView profile →

Felipe C Albuquerque, MD

Specialty details in registry · Phoenix, AZ

Shared published services
2 shared services · view billing descriptions
  • Insertion of tube into intracranial artery for diagnosis or treatment with review by radiologist (36223)
  • Insertion of tube into external neck artery for diagnosis or treatment with review by radiologist (36227)
22%Service-mix similarity~8.0 milesView profile →

Andrew Frederick Ducruet, M.D.

Neurosurgery (CMS) · Phoenix, AZ

Shared published services
2 shared services · view billing descriptions
  • Insertion of tube into intracranial artery for diagnosis or treatment with review by radiologist (36223)
  • Insertion of tube into external neck artery for diagnosis or treatment with review by radiologist (36227)
21%Service-mix similarity~8.0 milesView profile →

Mark Edward Oppenlander, MD

Neurosurgery (CMS) · Phoenix, AZ

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)
13%Service-mix similarity~9.4 milesView profile →

Bryan S Lee, M.D.

Neurosurgery (CMS) · Phoenix, AZ

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)
11%Service-mix similarity~9.4 milesView profile →

Rory Kenneth Murphy, MD

Neurosurgery (CMS) · Phoenix, AZ

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)
10%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.