Colonoscopy clinicians in Portland, Maine

CMS lists 39 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 Portland, Maine (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Joel Joseph, MD	235	92%
Miguel Arguedas-Brollo, MD	153	81%
Calin Stoicov, MD	126	73%
Michael Kelso, MD	120	71%
Igor Prokopiw, MD	110	68%
Gordon Millspaugh, MD	101	65%
Kellen Hipp, DO	96	63%
Shishira Bharadwaj, MD	93	61%
John Thompson, MD	88	59%
Benjamin Potter, MD	85	58%
Joshua Goldman, MD	81	55%
Catherine McCrann, MD	77	53%
Cristina Rutherford, MD	77	53%
James Morse, MD	76	53%
Kelly Pizzo, MD	76	53%
Nizar Hallak, MD	75	52%
Andreas Stefan, MD	75	52%
Matthew Grunwald, MD	74	52%
John Walker, DO	74	52%
Eric Elton, MD	69	49%
Christopher Kleeman, MD	69	49%
Kate Kennedy, MD	68	49%
Noemi Baffy, MD	65	47%
Thalia Mayes, MD	63	46%
Duncan Flynn, MD	62	45%
Eric Vecchio, MD	59	44%
Fernando Calmet, MD	57	42%
Daniil Rolshud, MD	51	39%
Mark Branda, MD	48	37%
Andrew Hsu, MD	48	37%
Stephen Eskin, MD	44	34%
Shadab Saboori, MD	36	29%
Robert McCabe, MD	34	28%
Sara Zelman, MD	30	25%
Angelo Fernandes, MD	27	23%
Martin Moehlen, MD	27	23%
Adam Winters, MD	25	22%
Amy Tan, MD	1-10	13% or below
Jered Windorski, 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.

Amy Smithline, MD Last reported August 18, 2026

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).