Colonoscopy clinicians in Portland, Oregon

CMS lists 94 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 Portland, Oregon (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Son Do, MD	144	78%
Jeffrey Weprin, MD	73	51%
Nima Motamedi, MD	67	48%
Mark Sofia, MD	67	48%
Amy Wang, MD	66	47%
Wei Wang, MD	65	47%
Richard Brandes, MD	64	46%
David Grunkemeier, MD	62	45%
Mohamed Osman, MD	59	44%
Matthew Smith, MD	58	43%
Gennadiy Bakis, MD	57	42%
Sarah Rodriguez, MD	56	42%
Justin Lewis, MD	53	40%
James Regan, MD	53	40%
Elisa Boden, MD	52	40%
Cristian Vallejos, MD	52	40%
Ian Holmes, MD	51	39%
Chris Hyun, MD	51	39%
Elliot Joo, MD	51	39%
Ting Zheng, MD	51	39%
Karl Kim, MD	50	38%
Margot Herman, MD	49	38%
Derek Taylor, MD	49	38%
Shannon Lewis, MD	48	37%
Navroop Nagra, MD	48	37%
Michael Phillips, MD	48	37%
Melissa Hershman, MD	47	36%
Albert Khine, MD	47	36%
Sarah Lee, MD	47	36%
Emily Jonica, MD	46	36%
Karen Saks, MD	46	36%
Willscott Naugler, MD	45	35%
Meghan Nesmith, MD	45	35%
Katherine Black, MD	44	34%
Jeremy Holden, MD	44	34%
Jeffrey Olson, MD	44	34%
Jay Poorman, MD	44	34%
Anil Sharma, MD	44	34%
Brent Lee, MD	43	34%
Paul Anderson, MD	42	33%
Alan Savoy, MD	42	33%
Michael Chew, MD	41	32%
Erik Vankleek, MD	41	32%
Ronald Lew, MD	40	32%
Lehel Somogyi, MD	40	32%
Susan Johnson, MD	39	31%
Anne Wang, MD	39	31%
Amy Zhu, MD	39	31%
Benjamin Hornung, MD	38	30%
Donald Lum, MD	38	30%
Ajay Singhvi, MD	37	30%
Stephen Vindigni, MD	37	30%
Brintha Enestvedt, MD	36	29%
Erich Vorlop, MD	35	28%
Ginger Degravelle, MD	34	28%
Monina Pascua, MD	34	28%
Molly Thomas, MD	34	28%
Sergio Crespo, MD	33	27%
Kellie Young, MD	32	27%
Jeffrey Buehler, MD	31	26%
Rebecca Fausel, MD	31	26%
Ross Vyhmeister, MD	31	26%
Sidharth Bhardwaj, MD	30	25%
Jeffrey Douglass, MD	30	25%
Branden Tarlow, MD	30	25%
Thienluong Domi Le, MD	29	25%
Manisha Apte, MD	28	24%
Siddharth Javia, MD	28	24%
Saad Jazrawi, MD	28	24%
Deron Amador, MD	27	23%
Sarah Diamond, MD	27	23%
Viju Deenadayalu, MD	26	23%
Debbie Cheng, MD	25	22%
Hong Shen, MD	25	22%
Robert Wilechansky, MD	25	22%
Aditi Reddy, MD	24	21%
Betty Kim, MD	23	21%
James Kurtz, DO	23	21%
Young Choi, MD	22	20%
Seth Crockett, MD	22	20%
Tiffany Lambrou, MD	22	20%
Jennifer Rodriguez, MD	22	20%
Kaveh Sharzehi, MD	20	19%
Manida Wungjiranirun, MD	19	18%
Jennifer Yeh, MD	17	17%
Fouad Otaki, MD	16	16%
Gregory Cote, MD	15	16%
Jessica Yu, MD	14	15%
Atif Zaman, MD	14	15%
Arnab Mitra, MD	13	14%
Dekey Lhewa, MD	12	14%
Tien Dong, MD	1-10	13% or below
Kenneth Flora, MD	1-10	13% or below
Jennifer Urquhart, 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.

Reported in previous releases

CMS does not report a colonoscopy volume for these clinicians in the October 2, 2026 release. Their pages show figures from earlier releases.

Jenna Anderson, MD Last reported August 18, 2026

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).