Colonoscopy clinicians in Santa Monica, California

CMS lists 71 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 Santa Monica, California (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Hamed Nayeb-Hashemi, MD	181	86%
William Katkov, MD	164	83%
Michael Quon, MD	148	79%
Rudolph Bedford, MD	134	76%
Danny Issa, MD	127	74%
Alireza Sedarat, MD	126	73%
Marc Wishingrad, MD	126	73%
Anna Skay, MD	123	72%
Kevin Ghassemi, MD	110	68%
James Sul, MD	110	68%
David Yamini, MD	109	67%
Benjamin Nulsen, MD	108	67%
Lenna Martyak, MD	98	63%
Sean Lai, MD	96	63%
Shahrad Shamsi, MD	95	62%
Mark Ovsiowitz, MD	91	60%
Kareem Sassi, MD	89	59%
Chanthel Kokoy Mondragon, MD	88	59%
Steven Seizer, MD	88	59%
Alexander Nguyen, MD	85	58%
Kevork Khadarian, MD	82	56%
Ronald Omino, MD	80	55%
Devin Patel, MD	80	55%
Venkataraman Muthusamy, MD	77	53%
Kamyar Shahedi, MD	77	53%
Samik Shah, MD	76	53%
Sterling Dubin, MD	75	52%
Andrew Gregg	70	50%
Demetrios Stavrakis, MD	68	49%
Sadeea Abbasi, MD	67	48%
Stephen Kim, MD	66	47%
Daisy Lankarani, MD	65	47%
Adrienne Lenhart, MD	65	47%
Bao Sean Nguyen, MD	62	45%
Daniel Eshtiaghpour, MD	60	44%
Adarsh Thaker, MD	60	44%
Terri Getzug	58	43%
Claudia Sanmiguel, MD	58	43%
Priyam Tripathi, MD	58	43%
Sonya Dasharathy, MD	57	42%
Rahul Dixit, MD	55	41%
Mary Farid, DO	53	40%
Didi Mwengela, MD	51	39%
Guy Weiss, MD	51	39%
Ellie Chen, MD	49	38%
Martha Hierro, MD	48	37%
Mona Rezapour, MD	47	36%
F Otis Stephen, MD	47	36%
Nirali Sheth, DO	45	35%
Camille Soroudi, MD	45	35%
Vikas Pabby, MD	43	34%
Jennifer Kolb, MD	41	32%
Niharika Mallepally, MD	39	31%
Vivy Cusumano, MD	38	30%
Carl Nordstrom, MD	38	30%
Anthony Myint, MD	35	28%
Nimah Ather, MD	34	28%
Uzoamaka Dike, MD	32	27%
Shida Haghighat, MD	26	23%
Dorian Mendoza, MD	26	23%
Gaurav Syal, MD	22	20%
Dennis Jensen, MD	19	18%
Amanda Krause, MD	17	17%
Berkeley Limketkai, MD	17	17%
Amir Ghaffari, MD	12	14%
Lynn Connolly, MD	11	13%
Martin Alpert, MD	1-10	13% or below
Nirupama Bonthala, MD	1-10	13% or below
David Chen, MD	1-10	13% or below
Brian Horwich, MD	1-10	13% or below
Jason Pan, 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).