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Compare the published Medicare service mix of Christian G Zimmerman, MD with clinicians in the same registry specialty: Neurosurgery (CMS).

BOISE, ID · Exact areaEdit location

2024 published service data · 14 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Kenneth M Little, MD

Neurosurgery (CMS) · Boise, ID

Shared published services
3 shared services · view billing descriptions
  • Partial removal of spine bone with release of lower spinal cord or nerves and/or removal of disc (63030)
  • Insertion of cage or mesh device to spine bone and disc space during spine fusion (22853)
  • Partial removal of spine bone with release of lower spinal cord and/or nerves, 1 segment (63047)
79%Service-mix similarityView profile →

Michael V Hajjar, MD

Neurosurgery (CMS) · Boise, ID

Shared published services
3 shared services · view billing descriptions
  • Insertion of cage or mesh device to spine bone and disc space during spine fusion (22853)
  • Partial removal of spine bone with release of lower spinal cord and/or nerves, 1 segment (63047)
  • Partial removal of spine bone with release of spinal cord and/or nerves, each additional segment (63048)
39%Service-mix similarityView profile →

Paul Joseph Montalbano, MD

Neurosurgery (CMS) · Boise, ID

Shared published services
3 shared services · view billing descriptions
  • Insertion of cage or mesh device to spine bone and disc space during spine fusion (22853)
  • Partial removal of spine bone with release of lower spinal cord and/or nerves, 1 segment (63047)
  • Partial removal of spine bone with release of spinal cord and/or nerves, each additional segment (63048)
39%Service-mix similarityView profile →

Thomas Crellin Manning, MD

Neurosurgery (CMS) · Boise, ID

Shared published services
3 shared services · view billing descriptions
  • Insertion of cage or mesh device to spine bone and disc space during spine fusion (22853)
  • Partial removal of spine bone with release of lower spinal cord and/or nerves, 1 segment (63047)
  • Partial removal of spine bone with release of spinal cord and/or nerves, each additional segment (63048)
38%Service-mix similarityView profile →

Richard Lochhead, MD

Neurosurgery (CMS) · Boise, ID

Shared published services
3 shared services · view billing descriptions
  • Insertion of cage or mesh device to spine bone and disc space during spine fusion (22853)
  • Partial removal of spine bone with release of lower spinal cord and/or nerves, 1 segment (63047)
  • Fusion of spine in lower back (22612)
30%Service-mix similarityView profile →

Kelly Jean Bridges, M.D.

Neurosurgery (CMS) · Boise, ID

Shared published services
2 shared services · view billing descriptions
  • Insertion of cage or mesh device to spine bone and disc space during spine fusion (22853)
  • Fusion of upper spine bone with removal of disc and release of spinal cord or nerve, 1 disc (22551)
23%Service-mix similarityView profile →

Graham Charles Hall, MD

Neurosurgery (CMS) · Boise, ID

Shared published services
2 shared services · view billing descriptions
  • Partial removal of spine bone with release of lower spinal cord and/or nerves, 1 segment (63047)
  • Placement of stabilizing device to back of 1 spine bone in neck (22840)
21%Service-mix similarityView profile →

Timothy J Johans, MD

Neurosurgery (CMS) · Boise, ID

Shared published services
2 shared services · view billing descriptions
  • Placement of stabilizing device to back of 1 spine bone in neck (22840)
  • Fusion of spine in lower back (22612)
19%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.