Colonoscopy clinicians in Portland, Oregon

CMS lists 95 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	138	77%
Mark Sofia, MD	80	55%
Navroop Nagra, MD	75	52%
Justin Lewis, MD	68	49%
Richard Brandes, MD	66	48%
Jeffrey Weprin, MD	66	48%
David Grunkemeier, MD	63	46%
Nima Motamedi, MD	63	46%
Michael Owens, MD	61	45%
Amy Wang, MD	60	45%
Elisa Boden, MD	59	44%
Ronald Lew, MD	59	44%
James Regan, MD	59	44%
Chris Hyun, MD	58	44%
Melissa Hershman, MD	57	43%
Jay Poorman, MD	56	42%
Wei Wang, MD	56	42%
Jeffrey Olson, MD	54	41%
Sarah Rodriguez, MD	54	41%
Gennadiy Bakis, MD	53	41%
Brent Lee, MD	53	41%
Matthew Smith, MD	53	41%
Ian Holmes, MD	52	40%
Sarah Lee, MD	52	40%
Shannon Lewis, MD	52	40%
Karen Saks, MD	52	40%
Derek Taylor, MD	52	40%
Albert Khine, MD	51	39%
Michael Phillips, MD	51	39%
Willscott Naugler, MD	50	39%
Margot Herman, MD	48	38%
Cristian Vallejos, MD	48	38%
Emily Jonica, MD	47	37%
Elliot Joo, MD	47	37%
Karl Kim, MD	47	37%
Lehel Somogyi, MD	47	37%
Ting Zheng, MD	46	36%
Ginger Degravelle, MD	45	36%
Erik Vankleek, MD	44	35%
Meghan Nesmith, MD	43	34%
Michael Chew, MD	42	34%
Susan Johnson, MD	42	34%
Paul Anderson, MD	40	33%
Debbie Cheng, MD	40	33%
Benjamin Hornung, MD	40	33%
Ajay Singhvi, MD	40	33%
Sidharth Bhardwaj, MD	39	32%
Alan Savoy, MD	39	32%
Katherine Black, MD	37	31%
Anil Sharma, MD	37	31%
Jeremy Holden, MD	36	30%
Donald Lum, MD	36	30%
Amy Zhu, MD	36	30%
Rebecca Fausel, MD	35	29%
Molly Thomas, MD	35	29%
Ross Vyhmeister, MD	35	29%
Kellie Young, MD	35	29%
Sergio Crespo, MD	34	29%
Monina Pascua, MD	33	28%
Jeffrey Douglass, MD	32	27%
Anne Wang, MD	32	27%
Sarah Diamond, MD	31	27%
Branden Tarlow, MD	31	27%
Brintha Enestvedt, MD	29	25%
Saad Jazrawi, MD	29	25%
Betty Kim, MD	29	25%
James Kurtz, DO	29	25%
Hong Shen, MD	29	25%
Manisha Apte, MD	28	25%
Stephen Vindigni, MD	28	25%
Robert Wilechansky, MD	28	25%
Viju Deenadayalu, MD	27	24%
Erich Vorlop, MD	27	24%
Kaveh Sharzehi, MD	26	23%
Jeffrey Buehler, MD	25	23%
Thienluong Domi Le, MD	24	22%
Deron Amador, MD	23	22%
Young Choi, MD	22	21%
Jessica Yu, MD	22	21%
Aditi Reddy, MD	20	19%
Seth Crockett, MD	19	19%
Tiffany Lambrou, MD	17	17%
Atif Zaman, MD	17	17%
Gregory Cote, MD	16	17%
Manida Wungjiranirun, MD	16	17%
Siddharth Javia, MD	15	16%
Jennifer Rodriguez, MD	15	16%
Arnab Mitra, MD	14	15%
Fouad Otaki, MD	14	15%
Dekey Lhewa, MD	13	15%
Jennifer Yeh, MD	12	14%
Jenna Anderson, MD	1-10	13% or below
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.

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).