Colonoscopy clinicians in Saint Paul, Minnesota

CMS lists 45 clinicians with a primary specialty of Gastroenterology, Internal Medicine, Family Practice, or General Practice who have billed Medicare for at least one colonoscopy and practice in Saint Paul, Minnesota (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Ahsan Bhatti, MD	315	96%
Chimaobi Anugwom	141	78%
Neil Phelan, MD	123	72%
Krista Newman, MD	112	69%
Charoen Mankongpaisarnrung	104	66%
Alyssa Anderson	94	62%
Edward Schaefer	89	59%
Ahmad Abdulkarim, MD	85	58%
Dharma Sunjaya	77	53%
Sheila Bharmal, MD	74	52%
Joanna Lenik-Oliva, MD	74	52%
Mustafa Tiewala, MD	68	49%
Adam Kim, MD	66	47%
Stanley Go, MD	64	46%
Paul Dambowy	63	46%
Hashim Nemat, MD	53	40%
Patrick Oreilly, MD	53	40%
Ahmed Kandiel, MD	52	40%
Catherine Skagen, MD	52	40%
Ivo Ditah, MD	50	38%
David Hanson, MD	50	38%
Anupama Nookala	49	38%
John Liveringhouse, MD	48	37%
Christopher Steevens	48	37%
Irshad Jafri, MD	46	36%
Emily Carver, MD	45	35%
Yuri Hanada, MD	44	34%
Erica Roberson, MD	44	34%
Nicholas Boetticher, MD	41	32%
Ahmed Dirweesh	40	32%
Karin Hagen, MD	38	30%
Peter Pico, MD	38	30%
Ioannis Pothoulakis, MD	37	30%
Dahlia Awais, MD	35	28%
Patrick Hoversten, MD	35	28%
Ronald Schwartz, MD	30	25%
Nabeel Azeem, MD	27	23%
Jeffrey Albrecht, MD	24	21%
Rebecca Li, MD	24	21%
Joshua Sloan, DO	11	13%
Stuart Amateau, MD	1-10	13% or below
Sara Frankwick, MD	1-10	13% or below
Peter Ganzer, MD	1-10	13% or below
James Hougas, MD	1-10	13% or below
Lourdes Villaume, MD	1-10	13% or below

Sorted by the number of colonoscopies billed to Medicare, highest first, not by quality or skill. CMS suppresses counts between 1 and 10 to protect patient privacy and publishes the range instead.

Understanding CMS Data

CMS's "Colonoscopy" category combines specific billing codes for colonoscopy to calculate the number of times each clinician billed Medicare for a "Colonoscopy." These include screening colonoscopy, diagnostic colonoscopy, and colonoscopy with biopsy or polyp removal. CMS's list also includes flexible sigmoidoscopy and laparoscopic appendectomy, so a clinician's count may include those procedures. CMS counts one procedure per patient per day, so a colonoscopy that included both a biopsy and a polyp removal counts once. CMS reports only procedures that clinicians billed to Original Medicare and Medicare Advantage. Therefore, CMS's procedure volume data does not include procedures that clinicians may have performed on patients who have other health care coverage (e.g., commercial insurance, self-pay, or the VA). Billing variation and coding errors can also affect CMS's data. Therefore, the number of procedures that CMS reports for a clinician may be higher or lower than the actual number of colonoscopies a clinician performed during the reporting period. Lastly, only clinicians with a primary specialty of Gastroenterology, Internal Medicine, Family Practice, or General Practice (as reported to Medicare) are presented.

Source: Centers for Medicare & Medicaid Services (October 2, 2026 release).