Colonoscopy clinicians in Chapel Hill, North Carolina

CMS lists 40 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 Chapel Hill, North Carolina (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Ian Grimm, MD	47	36%
Daniel Kroch, MD	46	36%
Lisa Gangarosa, MD	42	33%
Sydney Greenberg, MD	38	30%
Gabrielle Ritaccio, MD	34	28%
Walker Redd, MD	32	27%
Michael Dougherty, MD	29	25%
John Haydek, MD	28	24%
Joshua Hudson, MD	28	24%
Jonathan Hansen, MD	25	22%
Judy Trieu, MD	24	21%
Cary Cotton, MD	23	21%
Sarah McGill, MD	23	21%
Hans Herfarth, MD	22	20%
Robert Buccini, MD	20	19%
Sasha Deutsch-Link, MD	18	18%
Giselle Mahoro, MD	17	17%
Simon Gray, MD	16	16%
Morton Malkin, MD	16	16%
Julia Tang, MD	14	15%
Katherine Scholand, MD	13	14%
Animesh Jain, MD	11	13%
Katherine Allen, MD	1-10	13% or below
Shifali Arora, MD	1-10	13% or below
Edward Barnes, MD	1-10	13% or below
Todd Baron, MD	1-10	13% or below
Alfred Barritt, MD	1-10	13% or below
Spencer Dorn, MD	1-10	13% or below
Christina Gainey, MD	1-10	13% or below
Amit Gupta, MD	1-10	13% or below
Kelly Hathorn, MD	1-10	13% or below
Millie Long, MD	1-10	13% or below
Andrew Moon, MD	1-10	13% or below
Anne Peery, MD	1-10	13% or below
Craig Reed, MD	1-10	13% or below
Yolanda Scarlett, MD	1-10	13% or below
Neil Shah, MD	1-10	13% or below
Nicholas Shaheen, MD	1-10	13% or below
Shehzad Sheikh	1-10	13% or below
Hersh Shroff, 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).