Colonoscopy clinicians in Tucson, Arizona

CMS lists 49 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 Tucson, Arizona (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
John McNerney, MD	385	98%
Rizwan Safdar, MD	379	98%
Bryan Contreras, MD	360	97%
Larissa Allen, MD	347	97%
Bechara Mezher, MD	336	97%
Fadi Deeb, MD	333	97%
Michele Dodman, DO	308	96%
Anis Hanna, MD	293	96%
Robert McCallum, MD	283	95%
Rehan Iftikhar, MD	280	95%
Miguel Arenas, MD	274	95%
Scott Blinkoff, MD	274	95%
Bassel Kisso, MD	251	93%
Kavitha Waggoner, DO	243	93%
Le Roi Baez, MD	212	90%
Ibraheem Mizyed, MD	195	88%
Gary Monash, MD	118	70%
John Shekleton, MD	118	70%
Avin Aggarwal, MD	110	68%
Joshua Melson, MD	97	63%
Pooja Lal, MD	89	59%
Mark Lin, MD	89	59%
Rilwan Balogun, MD	87	58%
Rolando Leal, MD	83	56%
Vijit Chouhan, MD	75	52%
Sasha Taleban, MD	73	51%
Craig Gross, MD	71	50%
Cristiana Bortuzzo, MD	70	50%
Navin Barot, MD	65	47%
Stephanie Martinez Hawthorne, MD	52	40%
Diane Rodden, MD	51	39%
Gebran Abboud, MD	50	39%
Hemanth Gavini, MD	48	38%
Sylvain Sidi, MD	40	33%
Gary Gottlieb, MD	36	30%
Kristen Barrett, MD	29	25%
Kai Rou Tey, MD	27	24%
Ibrahim Yaghnam, MD	20	19%
Oleh Haluszka, MD	19	19%
Charles Krone, MD	17	17%
Juanita Merchant, MD	17	17%
Shivanand Bomman, MD	13	15%
Murray Orbuch, MD	12	14%
Geoffrey Block, MD	1-10	13% or below
Edmund Krasinski, DO	1-10	13% or below
Haripriya Maddur, MD	1-10	13% or below
Abdul Oseini, MD	1-10	13% or below
Bhupesh Pokhrel, MD	1-10	13% or below
Ahmad Shaban, 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).