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Compare the published Medicare service mix of Karen Hsia Ma, MD, PHARMD with clinicians in the same registry specialty: Gastroenterology · Internal Medicine (CMS).

ELMHURST, IL · Exact areaEdit location

2024 published service data · 12 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Jason Bradley Kramer, M.D.

Gastroenterology (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
79%Service-mix similarityView profile →

Allison Patricia Rzepczynski, MD

Gastroenterology (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
79%Service-mix similarityView profile →

Shakthi D Kumar, MD

Gastroenterology (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
74%Service-mix similarityView profile →

Patrick J Lynch, MD

Gastroenterology · Internal Medicine (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
70%Service-mix similarityView profile →

Danish Shahab, M.D.

Gastroenterology · Internal Medicine (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
69%Service-mix similarityView profile →

George Stathopoulos, MD

Gastroenterology (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
61%Service-mix similarityView profile →

Christopher A Boutin, MD

Gastroenterology · Internal Medicine (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43235)
  • Diagnostic exam of large bowel using a flexible endoscope (45378)
53%Service-mix similarityView profile →

Atena Lodhi, MD

Gastroenterology (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
50%Service-mix similarityView profile →

Ashish K Arora, MD

Gastroenterology (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
48%Service-mix similarityView profile →

Michael Greenspan, MD

Gastroenterology · Internal Medicine (CMS) · Elmhurst, IL

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43235)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
46%Service-mix similarityView profile →

Arouj Bajwa, MD

Gastroenterology · Internal Medicine (CMS) · Elmhurst, IL

Shared published services
1 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
22%Service-mix similarityView profile →

Eric Michael Montminy, MD

Gastroenterology · Internal Medicine (CMS) · Elmhurst, IL

Shared published services
2 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
15%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.