Colonoscopy clinicians in Saint Paul, Minnesota

CMS lists 44 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	296	96%
Chimaobi Anugwom	141	78%
Neil Phelan, MD	117	70%
Edward Schaefer	91	60%
Alyssa Anderson	88	59%
Charoen Mankongpaisarnrung	84	57%
Krista Newman, MD	81	55%
Dharma Sunjaya	75	52%
Patrick Hoversten, MD	74	52%
Ahmad Abdulkarim, MD	73	51%
Stanley Go, MD	70	50%
Ivo Ditah, MD	67	48%
Mustafa Tiewala, MD	65	47%
Sheila Bharmal, MD	63	46%
Adam Kim, MD	63	46%
John Liveringhouse, MD	63	46%
Paul Dambowy	58	44%
Christopher Steevens	57	43%
Irshad Jafri, MD	50	39%
Hashim Nemat, MD	49	38%
Patrick Oreilly, MD	49	38%
Erica Roberson, MD	47	37%
Catherine Skagen, MD	46	36%
Anupama Nookala	45	36%
Ahmed Kandiel, MD	43	34%
Ahmed Dirweesh	41	33%
Karin Hagen, MD	35	29%
Nabeel Azeem, MD	34	29%
Nicholas Boetticher, MD	34	29%
David Hanson, MD	34	29%
Dahlia Awais, MD	32	27%
Emily Carver, MD	31	27%
Yuri Hanada, MD	31	27%
Peter Pico, MD	31	27%
Jeffrey Albrecht, MD	30	26%
Joanna Lenik-Oliva, MD	29	25%
Ronald Schwartz, MD	27	24%
Ioannis Pothoulakis, MD	24	22%
Rebecca Li, MD	19	19%
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 (August 18, 2026 release).