Colonoscopy clinicians in Denver, Colorado

CMS lists 71 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 Denver, Colorado (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Thomas Welton, MD	180	86%
Bahri Bilir, MD	157	82%
Michael Rowley, MD	148	80%
Amir Kalani, MD	137	76%
Scott Hallgren, DO	118	70%
Jonathon Fishman, MD	108	67%
Benjamin Click, MD	94	62%
Ryan McWilliams, MD	94	62%
Rohan Clarke, MD	91	60%
Pujyitha Mandiga, MD	85	57%
Thomas Trouillot, MD	85	57%
Ariana Greenwood, MD	84	57%
Jennifer Brenner, MD	83	56%
Carlene Chun, MD	83	56%
Daniel Siegel, MD	82	56%
Blair Fennimore, MD	77	54%
Kevin Sieja, MD	77	54%
Colin Leffert, DO	72	51%
Kyley Leroy, DO	72	51%
Kelli Delay, MD	64	47%
Calen Steiner, MD	56	42%
Stephen New, MD	53	41%
Brian Dooreck, MD	50	39%
Frank Scott, MD	47	37%
Lawrence Miller, MD	44	35%
Laura Wolfe, MD	43	34%
Christie Blanton, MD	41	33%
Cameron Thompson, MD	40	33%
Jeffrey King, MD	39	32%
Pranav Periyalwar, MD	38	31%
Arash Babaei, MD	35	29%
Kevin Rufner, MD	32	27%
Nipun Reddy, MD	29	25%
Neil Toribara, MD	24	22%
Mathew Francis, MD	23	22%
Julie Polson, MD	23	22%
Alvaro Martinez Comacho, MD	22	21%
Jonathan Scott, DO	22	21%
Robert Simril, MD	21	20%
Jennifer Czwornog, MD	20	19%
Nicole Doria, MD	20	19%
John Goff, MD	20	19%
Donald Kirkpatrick, MD	20	19%
Kathleen Yan, MD	20	19%
Emily Harding-Theobald, MD	17	17%
Bharat Maraj, MD	17	17%
Augustin Attwell, MD	16	17%
Swati Patel, MD	14	15%
Stephen Sears, MD	14	15%
Natasha Klemm, MD	12	14%
Benjamin Cassell, MD	11	13%
Douglas Adler, MD	1-10	13% or below
Kenneth Berman, MD	1-10	13% or below
Courtney Bhat, MD	1-10	13% or below
Julie Heller, MD	1-10	13% or below
Vaman Jakribettuu, MD	1-10	13% or below
Heather Laskey, MD	1-10	13% or below
Vivian Lee, MD	1-10	13% or below
Tom Matzakos, MD	1-10	13% or below
Louis Morris, MD	1-10	13% or below
Jordan Neviackas, MD	1-10	13% or below
Mark Powis, MD	1-10	13% or below
Matthew Quallick, MD	1-10	13% or below
Thomas Queen, MD	1-10	13% or below
John Riopelle, DO	1-10	13% or below
Jack Scolaro, MD	1-10	13% or below
Christopher Shepela, MD	1-10	13% or below
Elizabeth Sofian-Conlan, MD	1-10	13% or below
Leslie Stark, MD	1-10	13% or below
Matthew Stotts, MD	1-10	13% or below
Preeyanka Sundar, 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).