A DIFFERENT WAY TO EXPLORE

Similar work.
More providers to explore.

Compare the published Medicare service mix of John Spehlmann, MD with clinicians in the same registry specialty: Anesthesiology.

LAKE FOREST, IL · Exact areaEdit location

2024 published service data · 22 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Matthew Kevin Reda, MD

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
87%Service-mix similarityView profile →

David Rosen, MD

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
86%Service-mix similarityView profile →

Janny Jun-Kim, M.D.

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
86%Service-mix similarityView profile →

Anuja Thakkar Walsh, D.O.

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
85%Service-mix similarityView profile →

Joseph Colligan, MD

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
85%Service-mix similarityView profile →

Brian C Rojek, DO

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
85%Service-mix similarityView profile →

Stanley Dee

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for lens surgery (00142)
85%Service-mix similarityView profile →

Craig Sopko, MD

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
84%Service-mix similarityView profile →

Mark Steveson

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
81%Service-mix similarityView profile →

Brian Zider, M.D.

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray or radiation therapy (01922)
80%Service-mix similarityView profile →

Eric E Meyer, MD

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for lens surgery (00142)
79%Service-mix similarityView profile →

George Hefner, MD

Anesthesiology · Lake Forest, IL

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for lens surgery (00142)
78%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.