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	387	98%
Rizwan Safdar, MD	366	98%
Bryan Contreras, MD	329	97%
Michele Dodman, DO	321	97%
Larissa Allen, MD	317	96%
Fadi Deeb, MD	314	96%
Anis Hanna, MD	297	96%
Rehan Iftikhar, MD	284	95%
Scott Blinkoff, MD	275	95%
Bechara Mezher, MD	273	95%
Robert McCallum, MD	257	94%
Kavitha Waggoner, DO	255	94%
Bassel Kisso, MD	242	93%
Miguel Arenas, MD	235	92%
Le Roi Baez, MD	221	91%
Ibraheem Mizyed, MD	184	87%
Gary Monash, MD	134	76%
John Shekleton, MD	129	74%
Avin Aggarwal, MD	92	61%
Rilwan Balogun, MD	88	59%
Joshua Melson, MD	85	58%
Rolando Leal, MD	83	57%
Diane Rodden, MD	81	55%
Craig Gross, MD	75	52%
Vijit Chouhan, MD	70	50%
Pooja Lal, MD	70	50%
Mark Lin, MD	67	48%
Sasha Taleban, MD	66	47%
Navin Barot, MD	64	46%
Cristiana Bortuzzo, MD	54	41%
Stephanie Martinez Hawthorne, MD	52	40%
Gebran Abboud, MD	49	38%
Gary Gottlieb, MD	42	33%
Hemanth Gavini, MD	34	28%
Yucel Aydin, MD	28	24%
Kristen Barrett, MD	26	23%
Sylvain Sidi, MD	23	21%
Ibrahim Yaghnam, MD	20	19%
Juanita Merchant, MD	19	18%
Shivanand Bomman, MD	18	18%
Oleh Haluszka, MD	17	17%
Charles Krone, MD	16	16%
Kai Rou Tey, MD	15	16%
Murray Orbuch, MD	13	14%
Geoffrey Block, MD	1-10	13% or below
Jama Darling, MD	1-10	13% or below
Edmund Krasinski, DO	1-10	13% or below
Haripriya Maddur, MD	1-10	13% or below
Bhupesh Pokhrel, 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.

Abdul Oseini, MD Last reported August 18, 2026
Ahmad Shaban, 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).