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Compare the published Medicare service mix of Hridaya Premnath Iyer, M.D with clinicians in the same registry specialty: Anesthesiology.

TUCSON, AZ · Exact areaEdit location

2024 published service data · 156 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Julie Lynn Holroyd

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
62%Service-mix similarityView profile →

Lakshminarayana Guttikonda, M.D.

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
60%Service-mix similarityView profile →

David Carlton Williamson, M.D.

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for procedure to assess heart electrical activity (00537)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
59%Service-mix similarityView profile →

Elizabeth Ann Mcintyre, M.D.

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Insertion of artery tube for blood sampling or infusion through skin (36620)
59%Service-mix similarityView profile →

James Anthony Aguilar, M.D.

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
58%Service-mix similarityView profile →

Rebecca Schofield Madigan, D.O.

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
58%Service-mix similarityView profile →

Ghada Isaac, M.D.

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
56%Service-mix similarityView profile →

Jason Lent

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for x-ray on artery of brain, heart, or chest (01926)
56%Service-mix similarityView profile →

Jiravud Chanvitayapongs, MD

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
56%Service-mix similarityView profile →

Aristidis George Delis, MD

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
  • Anesthesia for other procedure on lower abdomen (00840)
56%Service-mix similarityView profile →

Murray Eugene Dangelo, MD

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
54%Service-mix similarityView profile →

William Ryan Foster, MD

Anesthesiology · Tucson, AZ

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for exam of colon using an endoscope (00812)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on large bowel using an endoscope (00811)
54%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.