Colonoscopy clinicians in Burlington, Massachusetts

CMS lists 45 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 Burlington, Massachusetts (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Harry Elvanides, MD	228	92%
Brian Clark, MD	186	87%
Ronald Ste. Marie, MD	156	81%
Bryan Zoll, MD	145	79%
James Piper, MD	128	74%
Stella Chow, MD	126	73%
Khadija Chaudrey, MD	119	71%
Anna Leszczynski, MD	113	69%
Kristen Farwell, MD	111	68%
Annette Tobar, MD	111	68%
Lawrence Murphy, MD	110	68%
Randall Pellish, MD	110	68%
Rosa Bui, MD	108	67%
Yasmine Hussein Agha, MD	105	66%
Michelle Stefka, MD	100	64%
Mena Bakhit, MD	99	64%
Kenneth Shieh, MD	99	64%
Timothy Smith, MD	97	63%
David Burns, MD	96	63%
Pujitha Kudaravalli	96	63%
Khaldoon Khirfan, MD	95	62%
Haider Rahman	91	60%
Jay Luther, MD	84	57%
Ram Narasimhan, MD	83	57%
Katherine Brunner, MD	76	53%
Joseph Dailey, MD	76	53%
Seth Homer	73	51%
Syed Mahmood, MD	71	50%
Maria Lonshteyn, MD	69	49%
Charles Buzanis, MD	56	42%
Nicole Hanley-Williams, MD	54	41%
Bonnie Ewald, MD	41	32%
Ruth Ross McCormack, MD	33	27%
Stephen Fabry, MD	24	21%
Aurada Cholapranee, MD	21	20%
Carmi Punzalan, MD	12	14%
Kristen Robson, MD	11	13%
Chien Lin, MD	1-10	13% or below
Ming Lin, MD	1-10	13% or below
Raza Malik, MD	1-10	13% or below
Alan Noll, MD	1-10	13% or below
Amir Qamar, MD	1-10	13% or below
Amy Tien, MD	1-10	13% or below
Christopher Ward, MD	1-10	13% or below
Dmitriy Zilber, 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).