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Compare the published Medicare service mix of Carl K Atallah, DO with clinicians in the same registry specialty: Gastroenterology · Internal Medicine (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.

Manish Kumar Dhamija, M.D.

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
93%Service-mix similarityView profile →

Mona Lalehzari, MD

Internal Medicine (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
92%Service-mix similarityView profile →

Michael Flicker, M.D.

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
90%Service-mix similarityView profile →

Arturo Olivera, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
87%Service-mix similarityView profile →

Ruchi Patel, M.D.

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

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Biopsy of large bowel using a flexible endoscope (45380)
86%Service-mix similarityView profile →

Omar Said Nehme, MD

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
85%Service-mix similarityView profile →

Saad Q Aziz, D.O.

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
85%Service-mix similarityView profile →

Samuel F Castillo, M.D.

Gastroenterology · Internal Medicine (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
84%Service-mix similarityView profile →

Andrew Albert, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
82%Service-mix similarityView profile →

Krutika Lakhoo, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Biopsy of large bowel using a flexible endoscope (45380)
80%Service-mix similarityView profile →

Nidhi Akhileshwar Singh, M.D.

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
80%Service-mix similarityView profile →

Purnima V Balachandran, MD

Gastroenterology (CMS) · Chicago, IL

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
80%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.