Colonoscopy clinicians in Ann Arbor, Michigan

CMS lists 62 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 Ann Arbor, Michigan (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Jonathan Xia, MD	83	56%
Eric Shah, MD	72	51%
Mary Mortell, MD	70	50%
Shanti Eswaran, MD	66	48%
Beth Manoogian, MD	65	47%
Gregory Piech, MD	65	47%
Matthew Sturm, MD	63	46%
Albert Kim, MD	59	44%
Juhee Kim	55	42%
Darashana Punglia, MD	51	39%
Margaret Blayney	48	38%
Mary Takami, MD	48	38%
Matthew Dimagno, MD	47	37%
Erik-Jan Wamsteker	43	34%
Michael Rice, MD	42	34%
Jeffery Berinstein, MD	39	32%
Borko Nojkov, MD	39	32%
Ryan Stidham, MD	38	31%
Zachary Junga	36	30%
Neil Sheth, MD	36	30%
Molly Stone	35	29%
Andrea Todisco, MD	33	28%
Tannaz Guivatchian, MD	30	26%
Joan Chen, MD	27	24%
Shrinivas Bishu, MD	23	22%
Kira Newman, MD	23	22%
Elena Stoffel, MD	23	22%
Sonja Dawsey, MD	21	20%
Joseph Kolars, MD	21	20%
Stephanie Melquist	20	19%
Alexandra Shingina, MD	19	19%
Richard Kwon, MD	18	18%
Stacy Menees, MD	18	18%
Joel Rubenstein, MD	18	18%
Prashant Singh	18	18%
Robert Fontana, MD	17	17%
Peter Higgins, MD	17	17%
Frederick Askari, MD	16	17%
Alisa Likhitsup, MD	16	17%
Jessica Sheehan, MD	16	17%
Graham Brady, MD	14	15%
Neehar Parikh, MD	14	15%
Elizabeth Speliotes, MD	14	15%
George Philips, MD	13	15%
Andrew Read, MD	13	15%
Allen Lee, MD	11	13%
Winnie Zou	11	13%
Marc Cantwell, MD	1-10	13% or below
Joy Chang, MD	1-10	13% or below
Vincent Chen, MD	1-10	13% or below
William Chey, MD	1-10	13% or below
Hari Conjeevaram, MD	1-10	13% or below
Kelly Cushing-Damm, MD	1-10	13% or below
John Delvalle, MD	1-10	13% or below
Jacob Kurlander, MD	1-10	13% or below
Hellan Kwon, MD	1-10	13% or below
Jorge Machicado Rivero, MD	1-10	13% or below
Nikhilesh Mazumder	1-10	13% or below
Nataliya Razumilava, MD	1-10	13% or below
Samara Rifkin	1-10	13% or below
Allison Schulman, MD	1-10	13% or below
Pratima Sharma	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).