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	267	94%
Brian Clark, MD	221	91%
Ronald Ste. Marie, MD	155	81%
Khadija Chaudrey, MD	137	76%
Stella Chow, MD	119	71%
Kristen Farwell, MD	116	70%
James Piper, MD	115	69%
Kenneth Shieh, MD	115	69%
Lawrence Murphy, MD	110	68%
Randall Pellish, MD	110	68%
Michelle Stefka, MD	110	68%
Annette Tobar, MD	106	66%
Mena Bakhit, MD	103	65%
Pujitha Kudaravalli	102	65%
Yasmine Hussein Agha, MD	101	64%
Khaldoon Khirfan, MD	100	64%
Timothy Smith, MD	100	64%
Seth Homer	99	64%
Bryan Zoll, MD	97	63%
Rosa Bui, MD	96	62%
Anna Leszczynski, MD	95	62%
Charles Buzanis, MD	94	62%
Haider Rahman	94	62%
David Burns, MD	90	60%
Jay Luther, MD	87	58%
Maria Lonshteyn, MD	85	57%
Ram Narasimhan, MD	81	55%
Joseph Dailey, MD	77	54%
Syed Mahmood, MD	71	50%
Bonnie Ewald, MD	52	40%
Nicole Hanley-Williams, MD	47	37%
Katherine Brunner, MD	42	34%
Ruth Ross McCormack, MD	29	25%
Aurada Cholapranee, MD	24	22%
Stephen Fabry, MD	19	19%
Kristen Robson, MD	19	19%
Carmi Punzalan, 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	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 (August 18, 2026 release).