Colonoscopy clinicians in Boston, Massachusetts

CMS lists 219 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	268	94%
Catherine Cheney, MD	240	93%
Sunil Sheth, MD	211	90%
Douglas Pleskow, MD	206	89%
Tyler Berzin, MD	198	88%
Joseph Feuerstein, MD	196	88%
Ewa Preneta, MD	177	85%
Steven Fine, MD	171	84%
Mandeep Sawhney, MD	168	84%
Norman Nishioka, MD	162	82%
Hiroyuki Aihara, MD	159	82%
Cameron Parent, MD	149	80%
Douglas Horst, MD	143	78%
Daniel Stein, MD	138	77%
Michael Thiim, MD	133	75%
Anne Liu, MD	129	74%
Katharine Germansky, MD	127	73%
Steven Shields, MD	121	71%
Irena Maier, MD	115	69%
James Piper, MD	115	69%
Roshan Razik, MD	111	68%
James Richter, MD	110	68%
Kenneth Falchuk, MD	108	67%
Nikroo Hashemi, MD	107	67%
Iman Boston	105	66%
Manish Gala, MD	102	65%
Khaldoon Khirfan, MD	100	64%
Seth Homer	99	64%
Vikram Rangan, MD	95	62%
Charles Buzanis, MD	94	62%
Matthew Hamilton, MD	94	62%
Esperance Schaefer, MD	93	61%
Gale Fiarman, MD	91	60%
Joseph Yarze, MD	90	60%
Sveta Oza, MD	88	59%
Jay Luther, MD	87	58%
Jacqueline Wolf, MD	85	57%
Ryan Flanagan, MD	83	56%
Andres Mogollon, MD	82	56%
Aarti Kakkar, MD	81	55%
Hong Gi Shim, MD	81	55%
Steven Steinway, MD	77	54%
Fernando Martinez, MD	75	52%
Barbara Nath, MD	75	52%
Jaime Oviedo, MD	75	52%
Vlaicu Botoman, MD	74	52%
Nikola Natov, MD	74	52%
Erik Holzwanger, MD	72	51%
Jacques Reichling, MD	72	51%
Samantha Zullow, MD	72	51%
Michal Tomczak, MD	70	50%
Steven Freedman, MD	68	49%
Johanna Iturrino, MD	68	49%
David Jin, MD	68	49%
Caroline Jouhourian, MD	68	49%
Judy Nee, MD	68	49%
Chethan Ramprasad	68	49%
Alykhan Shamji, MD	68	49%
William Brugge, MD	66	48%
Elisa Valente, MD	66	48%
Wanda Blanton, MD	65	47%
Peter Carolan, MD	65	47%
Adam Cheifetz, MD	64	47%
Veronica Baptista, MD	61	45%
Sonali Palchaudhuri, MD	61	45%
Zhenglun Zhu, MD	61	45%
Sarah Shannahan, MD	60	45%
Brian Surjanhata	60	45%
Sarah Flier, MD	59	44%
Navin Kumar, MD	58	44%
Christopher Velez, MD	58	44%
Alan Wong, MD	57	43%
Daniel Chung, MD	56	42%
David Nagle, MD	56	42%
Michael Dougan	54	41%
Alexander Goldowsky, MD	54	41%
Shilpa Grover, MD	50	39%
Harmony Allison, MD	49	38%
Kathleen Corey, MD	49	38%
Kathleen Viveiros, MD	48	38%
Laurie Grossberg, MD	47	37%
David Nunes, MD	47	37%
Rohini Vij Bhatia, MD	46	36%
Ruma Rajbhandari, MD	46	36%
Sanskriti Varma, MD	46	36%
Phoenix Fung, MD	45	36%
Amit Ringel, MD	45	36%
Amelie Therrien, MD	45	36%
Mark Ferreira	44	35%
Kunal Jajoo, MD	44	35%
Daniel Mishkin, MD	44	35%
Nezam Afdhal, MD	43	34%
Nir Bar, MD	43	34%
Braden Kuo, MD	43	34%
Jordan Sack, MD	43	34%
Kyle Staller, MD	43	34%
Xiaocen Zhang, MD	41	33%
Charles Bliss, MD	40	33%
Raymond Chung, MD	40	33%
Loren Rabinowitz, MD	40	33%
Uri Avissar, MD	39	32%
Sanchit Gupta, MD	39	32%
Ramona M Lim	39	32%
Jonah Cohen, MD	38	31%
Colleen Kelly, MD	38	31%
Lynne Ahn, MD	35	29%
Razvan Arsenescu, MD	35	29%
Jennifer Cai	35	29%
Walter Chan, MD	35	29%
Julia Ding, MD	35	29%
Brian Li	35	29%
Lori Olans, MD	35	29%
Shana Rakowsky, MD	35	29%
Nicolette Rodriguez	35	29%
Long Nguyen	34	29%
Christopher Huang, MD	33	28%
Bharati Kochar, MD	33	28%
Thomas Moore, MD	33	28%
Diane Abraczinskas, MD	32	27%
Nayantara Orekondy, MD	32	27%
Andrew Chan, MD	31	27%
Sonia Friedman, MD	31	27%
Brian Jacobson, MD	31	27%
Anna Rutherford, MD	31	27%
Sushrut Jangi, MD	30	26%
Karin Andersson, MD	29	25%
Madeleine Haff, MD	29	25%
Lin Shen, MD	29	25%
Xiao Tan, MD	29	25%
Gaurav Gaiha, MD	28	25%
Wei Zhang, MD	28	25%
Javier Villafuerte Galvez, MD	27	24%
Sitharthan Sekar, MD	26	23%
Rachel Winter, MD	26	23%
Cindy Law, MD	25	23%
Linda Lee, MD	25	23%
Marvin Ryou, MD	25	23%
Ashwin Ananthakrishnan	24	22%
Aurada Cholapranee, MD	24	22%
Hamed Khalili	24	22%
Emilie Mitten, MD	24	22%
Sharmeel Wasan, MD	24	22%
Zachary Fricker, MD	23	22%
Michael Curry, MD	22	21%
Disentuwahandi De Silva	22	21%
Marc Sherman, MD	22	21%
Kristin Burke, MD	21	20%
David Cave, MD	21	20%
Eric Goldberg, MD	20	19%
Harishankar Gopakumar, MD	20	19%
Emily Lopes, MD	20	19%
Ansu Noronha, MD	20	19%
Eric Przybyszewski, MD	20	19%
Puja Rai, MD	20	19%
Russell Goodman	19	19%
Wai-Kit Lo, MD	19	19%
Rupa Mukherjee, MD	19	19%
Nneka Ufere, MD	19	19%
Irun Bhan, MD	18	18%
Alan Bonder, MD	18	18%
Katie Dunleavy, MD	18	18%
Yasmin Hernandez-Barco, MD	18	18%
Scott Minchenberg, MD	18	18%
Arpan Mohanty	18	18%
Stephanie Owyang, MD	18	18%
Amandeep Singh, MD	18	18%
Jasmine Hanifi, MD	17	17%
Molly Perencevich, MD	17	17%
Adjoa Anyane-Yeboa	16	17%
Yousef Badran, MD	16	17%
Adnan Khan, MD	16	17%
Arushi Kohli, MD	16	17%
John Paul Nsubuga, MD	16	17%
Doan Dao, MD	15	16%
Robert Lowe, MD	15	16%
Jonathan Downie	14	15%
Andrea Reid, MD	14	15%
Suzanne Chan, MD	13	15%
Zhuo Geng, MD	13	15%
Brenna Casey, MD	12	14%
Kumar Krishnan, MD	12	14%
Behnam Saberi, MD	12	14%
John Saltzman, MD	12	14%
Sara Khaled Ghoneim, MD	11	13%
Kevin Huang, MD	11	13%
Vanessa Mitsialis, 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
Zhenghui Jiang, MD	1-10	13% or below
Pichamol Jirapinyo	1-10	13% or below
Casey Johnson, MD	1-10	13% or below
Gila Kriegel, MD	1-10	13% or below
Michelle Lai, MD	1-10	13% or below
John Leung, MD	1-10	13% or below
Phillip Levine, MD	1-10	13% or below
Xing Li, MD	1-10	13% or below
Chien Lin, MD	1-10	13% or below
Alan Moss, MD	1-10	13% or below
Mayssan Muftah, 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
Jaspreet Sandhu	1-10	13% or below
Daniel Sands, MD	1-10	13% or below
Gila Sasson	1-10	13% or below
Tracey Simon, MD	1-10	13% or below
Daniel Szvarca, MD	1-10	13% or below
Michael Talanian	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
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.

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).