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Compare the published Medicare service mix of Purnima V Balachandran, MD with clinicians in the same registry specialty: Gastroenterology (CMS).

CHICAGO, IL · Exact areaEdit location

2024 published service data · 158 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Stephen Y Chang, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Biopsy of large bowel using a flexible endoscope (45380)
83%Service-mix similarityView profile →

Andrew Albert, MD

Gastroenterology (CMS) · Chicago, IL

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)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
82%Service-mix similarityView profile →

Ruchi Patel, M.D.

Gastroenterology · Hospitalist · Internal Medicine (CMS) · Chicago, IL

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)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
82%Service-mix similarityView profile →

Omar Said Nehme, MD

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

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)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
81%Service-mix similarityView profile →

Leila Kia, MD

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Biopsy of large bowel using a flexible endoscope (45380)
80%Service-mix similarityView profile →

Carl K Atallah, DO

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
80%Service-mix similarityView profile →

Samuel F Castillo, M.D.

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
80%Service-mix similarityView profile →

Amit Ishwarlal Patel, M.D

Internal Medicine (CMS) · Chicago, IL

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)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
79%Service-mix similarityView profile →

Saad Q Aziz, D.O.

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
78%Service-mix similarityView profile →

Arun K Verma, M.D.

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

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)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
77%Service-mix similarityView profile →

Paul V Fahrenbach, MD

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

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)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
77%Service-mix similarityView profile →

David M. Shapiro, MD

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Biopsy of large bowel using a flexible endoscope (45380)
77%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.