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Colonoscopy clinicians in Denver, Colorado

CMS lists 72 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 161 82%
Bahri Bilir, MD 160 82%
Michael Rowley, MD 147 79%
Amir Kalani, MD 146 79%
James Higham Kessler, MD 130 75%
Scott Hallgren, DO 115 70%
Tamas Otrok, MD 115 70%
Jonathon Fishman, MD 103 65%
Ariana Greenwood, MD 93 61%
Carlene Chun, MD 89 59%
Benjamin Click, MD 88 59%
Rohan Clarke, MD 86 58%
Daniel Siegel, MD 85 58%
Thomas Trouillot, MD 84 57%
Ryan McWilliams, MD 83 57%
Blair Fennimore, MD 80 55%
Pujyitha Mandiga, MD 80 55%
Jennifer Brenner, MD 76 53%
Kevin Sieja, MD 75 52%
Kelli Delay, MD 70 50%
Calen Steiner, MD 60 44%
Brian Dooreck, MD 59 44%
Kyley Leroy, DO 57 42%
Colin Leffert, DO 56 42%
Stephen New, MD 56 42%
Lawrence Miller, MD 51 39%
Jeffrey King, MD 47 36%
Frank Scott, MD 47 36%
Christie Blanton, MD 34 28%
Natasha Klemm, MD 34 28%
Pranav Periyalwar, MD 33 27%
Arash Babaei, MD 31 26%
Mathew Francis, MD 30 25%
Kevin Rufner, MD 30 25%
Laura Wolfe, MD 29 25%
John Goff, MD 23 21%
Bharat Maraj, MD 20 19%
Donald Kirkpatrick, MD 19 18%
Alvaro Martinez Comacho, MD 18 18%
Julie Polson, MD 18 18%
Nipun Reddy, MD 18 18%
Cameron Thompson, MD 18 18%
Swati Patel, MD 17 17%
Benjamin Cassell, MD 16 16%
Robert Simril, MD 16 16%
Kathleen Yan, MD 16 16%
Emily Harding-Theobald, MD 15 16%
Jonathan Scott, DO 15 16%
Augustin Attwell, MD 13 14%
Neil Toribara, MD 13 14%
Jennifer Czwornog, MD 12 14%
Nicole Doria, MD 12 14%
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
John Riopelle, DO 1-10 13% or below
Jack Scolaro, MD 1-10 13% or below
Stephen Sears, 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.

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).