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Colonoscopy clinicians in Boston, Massachusetts

CMS lists 222 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 Boston, Massachusetts (details below).

Colonoscopy volume

Clinician Colonoscopies billed Percentile rank
Harry Anastopoulos, MD 264 94%
Catherine Cheney, MD 257 94%
Joseph Feuerstein, MD 203 89%
Douglas Pleskow, MD 195 88%
Tyler Berzin, MD 194 88%
Sunil Sheth, MD 193 88%
Mandeep Sawhney, MD 184 87%
Norman Nishioka, MD 172 85%
Ewa Preneta, MD 169 84%
Hiroyuki Aihara, MD 165 83%
Douglas Horst, MD 156 81%
Steven Fine, MD 152 80%
Daniel Stein, MD 142 78%
Cameron Parent, MD 132 75%
James Piper, MD 128 74%
Manish Gala, MD 125 73%
Katharine Germansky, MD 125 73%
Anne Liu, MD 124 73%
Michael Thiim, MD 120 71%
Iman Boston 117 70%
Steven Shields, MD 115 70%
Vikram Rangan, MD 107 67%
Jacqueline Wolf, MD 105 66%
Irena Maier, MD 103 65%
Nikroo Hashemi, MD 102 65%
Roshan Razik, MD 97 63%
Matthew Hamilton, MD 96 63%
James Richter, MD 96 63%
Khaldoon Khirfan, MD 95 62%
Joseph Yarze, MD 91 60%
Jaime Oviedo, MD 88 59%
Esperance Schaefer, MD 88 59%
Hong Gi Shim, MD 88 59%
Sveta Oza, MD 87 59%
Jay Luther, MD 84 57%
Ryan Flanagan, MD 81 55%
David Nagle, MD 81 55%
Aarti Kakkar, MD 80 55%
Gale Fiarman, MD 79 54%
Elisa Valente, MD 78 54%
Jacques Reichling, MD 77 53%
Chethan Ramprasad 75 52%
Erik Holzwanger, MD 74 52%
Fernando Martinez, MD 74 52%
Seth Homer 73 51%
Nikola Natov, MD 73 51%
David Jin, MD 72 51%
Wanda Blanton, MD 70 50%
Samantha Zullow, MD 70 50%
Alykhan Shamji, MD 69 49%
Kenneth Falchuk, MD 68 49%
Caroline Jouhourian, MD 68 49%
Steven Freedman, MD 67 48%
Andres Mogollon, MD 67 48%
Barbara Nath, MD 67 48%
Steven Steinway, MD 67 48%
Vlaicu Botoman, MD 66 47%
Johanna Iturrino, MD 66 47%
Amit Ringel, MD 66 47%
Alexander Goldowsky, MD 64 46%
Brian Surjanhata 64 46%
Brian Li 63 46%
Judy Nee, MD 63 46%
Sanskriti Varma, MD 61 45%
Kathleen Corey, MD 60 44%
Sonali Palchaudhuri, MD 60 44%
Veronica Baptista, MD 58 43%
Adam Cheifetz, MD 58 43%
Phoenix Fung, MD 58 43%
Sarah Shannahan, MD 58 43%
Charles Buzanis, MD 56 42%
Daniel Chung, MD 56 42%
Christopher Velez, MD 56 42%
Alan Wong, MD 55 41%
Michal Tomczak, MD 54 41%
Shana Rakowsky, MD 53 40%
Zhenglun Zhu, MD 53 40%
William Brugge, MD 52 40%
Laurie Grossberg, MD 52 40%
Ramona M Lim 52 40%
Shilpa Grover, MD 51 39%
Sitharthan Sekar, MD 51 39%
Peter Carolan, MD 50 38%
Sarah Flier, MD 49 38%
Sonia Friedman, MD 48 37%
Loren Rabinowitz, MD 48 37%
Amelie Therrien, MD 48 37%
Ruma Rajbhandari, MD 47 36%
Rohini Vij Bhatia, MD 45 35%
Colleen Kelly, MD 45 35%
Jonah Cohen, MD 43 34%
Kunal Jajoo, MD 43 34%
Kyle Staller, MD 43 34%
Michael Dougan 41 32%
Mark Ferreira 41 32%
Daniel Mishkin, MD 41 32%
David Nunes, MD 41 32%
Nezam Afdhal, MD 40 32%
Razvan Arsenescu, MD 40 32%
Arushi Kohli, MD 40 32%
Harmony Allison, MD 39 31%
Nir Bar, MD 39 31%
Brian Jacobson, MD 39 31%
Lori Olans, MD 39 31%
Diane Abraczinskas, MD 38 30%
Cindy Law, MD 37 30%
Jordan Sack, MD 37 30%
Kathleen Viveiros, MD 37 30%
Charles Bliss, MD 36 29%
Uri Avissar, MD 35 28%
Christopher Huang, MD 35 28%
Bharati Kochar, MD 35 28%
Lynne Ahn, MD 34 28%
Anna Rutherford, MD 34 28%
Leah Creahan, MD 33 27%
Sushrut Jangi, MD 32 27%
Jennifer Cai 31 26%
Navin Kumar, MD 31 26%
Jonathan Downie 30 25%
Long Nguyen 30 25%
Ashwin Ananthakrishnan 29 25%
Walter Chan, MD 29 25%
Raymond Chung, MD 29 25%
Madeleine Haff, MD 29 25%
Rachel Winter, MD 29 25%
Xiaocen Zhang, MD 29 25%
Disentuwahandi De Silva 28 24%
Russell Goodman 28 24%
Sanchit Gupta, MD 28 24%
Thomas Moore, MD 28 24%
Lin Shen, MD 28 24%
Karin Andersson, MD 27 23%
Hamed Khalili 27 23%
Emilie Mitten, MD 27 23%
Marc Sherman, MD 27 23%
Nayantara Orekondy, MD 26 23%
Wei Zhang, MD 26 23%
Zachary Fricker, MD 25 22%
Scott Minchenberg, MD 25 22%
Xiao Tan, MD 25 22%
Kristin Burke, MD 24 21%
Andrew Chan, MD 24 21%
Nicolette Rodriguez 24 21%
Gaurav Gaiha, MD 23 21%
Sara Khaled Ghoneim, MD 23 21%
Linda Lee, MD 23 21%
Michael Curry, MD 22 20%
Puja Rai, MD 22 20%
Aurada Cholapranee, MD 21 20%
Irun Bhan, MD 20 19%
John Paul Nsubuga, MD 20 19%
Eric Przybyszewski, MD 20 19%
Emily Lopes, MD 19 18%
Marvin Ryou, MD 19 18%
Alan Bonder, MD 18 18%
Rahul Dalal 18 18%
Katie Dunleavy, MD 18 18%
Javier Villafuerte Galvez, MD 18 18%
Suzanne Chan, MD 17 17%
Pichamol Jirapinyo 17 17%
Robert Lowe, MD 17 17%
Rupa Mukherjee, MD 17 17%
Adjoa Anyane-Yeboa 16 16%
Stephanie Owyang, MD 16 16%
Sharmeel Wasan, MD 16 16%
Yousef Badran, MD 15 16%
Julia Ding, MD 15 16%
Adnan Khan, MD 15 16%
Ansu Noronha, MD 15 16%
Kevin Huang, MD 14 15%
Kumar Krishnan, MD 14 15%
Michelle Lai, MD 14 15%
Arpan Mohanty 14 15%
Jaspreet Sandhu 14 15%
Amandeep Singh, MD 14 15%
Zhuo Geng, MD 13 14%
Harishankar Gopakumar, MD 13 14%
Molly Perencevich, MD 13 14%
John Saltzman, MD 13 14%
Michael Talanian 13 14%
David Cave, MD 12 14%
Xing Li, MD 12 14%
Wai-Kit Lo, MD 12 14%
Daniel Szvarca, MD 12 14%
Brenna Casey, MD 11 13%
Behnam Saberi, MD 11 13%
Nneka Ufere, MD 11 13%
Jessica Allegretti, MD 1-10 13% or below
Akwi Asombang, MD 1-10 13% or below
Emily Bethea, MD 1-10 13% or below
Maria Catana, MD 1-10 13% or below
Doan Dao, MD 1-10 13% or below
Eric Goldberg, MD 1-10 13% or below
Jasmine Hanifi, MD 1-10 13% or below
Yasmin Hernandez-Barco, MD 1-10 13% or below
Zhenghui Jiang, MD 1-10 13% or below
Casey Johnson, MD 1-10 13% or below
Marisa Jupiter, MD 1-10 13% or below
Alyson Kaplan, MD 1-10 13% or below
Gila Kriegel, MD 1-10 13% or below
John Leung, MD 1-10 13% or below
Phillip Levine, MD 1-10 13% or below
Chien Lin, MD 1-10 13% or below
Nayna Lodhia, MD 1-10 13% or below
Vanessa Mitsialis, MD 1-10 13% or below
Alan Moss, MD 1-10 13% or below
Alan Noll, MD 1-10 13% or below
Charles Parsons, MD 1-10 13% or below
Trisha Pasricha, MD 1-10 13% or below
Vilas Patwardhan, MD 1-10 13% or below
Lilani Perera, MD 1-10 13% or below
Sheela Reddy, MD 1-10 13% or below
Andrea Reid, MD 1-10 13% or below
Daniel Sands, MD 1-10 13% or below
Tracey Simon, MD 1-10 13% or below
Christopher Thompson, MD 1-10 13% or below
Carlo Traverso, MD 1-10 13% or below
Trent Walradt 1-10 13% or below
Horst Weber, MD 1-10 13% or below
Harland Winter, MD 1-10 13% or below
Lauren Yang, MD 1-10 13% or below
Rubaina Zaman, 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).