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Colonoscopy clinicians in San Francisco, California

CMS lists 91 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 San Francisco, California (details below).

Colonoscopy volume

Clinician Colonoscopies billed Percentile rank
Dennis Shen, MD 505 99%
Jesse Liu, MD 343 97%
James Yan, DO 335 97%
Kenneth Binmoeller, MD 300 96%
Susan Ripper, MD 297 96%
Michael Verhille, MD 273 95%
Annette Kwon, MD 250 94%
Timothy Chen, MD 232 92%
Natalie Lee, MD 200 89%
Andrew Nett, MD 199 89%
Aristotle Mendiola, MD 185 87%
Christopher Hogan, MD 182 86%
Elijah Verheyen, MD 182 86%
Daniel Conlin, MD 181 86%
Robert Elsen, MD 170 84%
Frank Farrell, MD 168 84%
Jennifer Frankel, MD 167 84%
Vikram Malladi, MD 163 83%
Ripple Sharma, MD 152 80%
Waseem Ahmad, MD 148 79%
Amir Prushani, MD 139 77%
Myung Ko, MD 124 73%
James Torosis, MD 122 72%
Connie Wang, MD 113 69%
Vicky Yang, MD 110 68%
Sirisha Grandhe, MD 105 66%
Sara Lewin, MD 101 65%
Jonathan Terdiman, MD 101 65%
Thomas Myint, MD 96 63%
Yen Quang, MD 93 61%
Shreya Patel, MD 88 59%
Cheikh Njie, MD 85 58%
Kendall Beck, MD 78 54%
Kevin Man, MD 78 54%
Priya Kathpalia, MD 72 51%
Patrick Avila, MD 71 50%
Ma Somsouk, MD 71 50%
Jeffrey Singerman, MD 70 50%
Mimi Lin, MD 63 46%
Justin Field, MD 62 45%
Daniel Rengstorff, MD 61 45%
Cathleen Cabansag, MD 59 44%
Max Brondfield, MD 57 42%
Laura Chiu, MD 56 42%
Rishika Chugh, MD 56 42%
Colin Feuille, MD 56 42%
Anupam Aditi, MD 55 41%
Sun Chuan Dai, MD 51 39%
Michael Larsen, MD 51 39%
Benjamin Yip, MD 51 39%
Tonya Kaltenbach, MD 50 38%
Pooja Dharwadkar, MD 48 37%
Christopher Rombaoa, MD 48 37%
Justin Sewell, MD 45 35%
Yongyan Cui, MD 44 34%
James Reed, MD 43 34%
John Bettinger, MD 39 31%
Rena Mei, MD 39 31%
Maria Duarte, MD 38 30%
Adam Blaisdell, MD 37 30%
Uma Mahadevan, MD 36 29%
Aparajita Singh, MD 36 29%
Abdul Kouanda, MD 35 28%
Michele Tana, MD 35 28%
Cynthia Leung, MD 34 28%
Ruzbeh Mosadeghi, MD 28 24%
Allyson Richardson, MD 28 24%
Michael Li, MD 24 21%
Arielle Klepper, MD 23 21%
Dean Rider, MD 22 20%
Madhuri Badrinath, MD 17 17%
Jin Ge, MD 17 17%
Jacquelyn Maher, MD 16 16%
Jennifer Chen, MD 13 14%
Vivek Rudrapatna, MD 13 14%
Nghiem Ha, MD 11 13%
Nancy Ho, MD 11 13%
Matthew Chang, MD 1-10 13% or below
Timothy Davern, MD 1-10 13% or below
Jeffrey Fox, MD 1-10 13% or below
Richard Frederick, MD 1-10 13% or below
Gregory Fung, MD 1-10 13% or below
Nazia Hasan, MD 1-10 13% or below
Yao Heng, MD 1-10 13% or below
Edward Holt, MD 1-10 13% or below
Neil Mehta, MD 1-10 13% or below
Raphael Merriman, MD 1-10 13% or below
Nizar Mukhtar, MD 1-10 13% or below
Yume Nguyen, MD 1-10 13% or below
Francis Yao, MD 1-10 13% or below
Debra Yen, 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.

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).