Colonoscopy clinicians in Tulsa, Oklahoma

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 Tulsa, Oklahoma (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Christian Clark, MD	246	93%
John Hood, MD	232	92%
Michael Martin, MD	226	91%
Kevin McNamara, MD	216	90%
Matt Blankenship, MD	196	88%
William Briggs, MD	187	87%
Febin John, MD	180	86%
Andrew Crawford, DO	177	85%
Amjad Mreyoud, MD	151	80%
Markham Nightengale, MD	146	79%
Brandon Conkling, DO	141	78%
Geoffrey Fillmore, DO	141	78%
David Meehan, DO	133	75%
Aatish Patel, MD	132	75%
Richard Jesudass, MD	128	74%
Aaron Fieker, DO	127	74%
Sarah Oberste, DO	124	73%
Michael Warren, DO	124	73%
Eric Cottrill, MD	123	72%
Jeffery Blonsky, MD	121	72%
Christopher Lynch, MD	120	71%
Roy Thompson, MD	120	71%
Dushyant Singh, MD	119	71%
Robert Aran, DO	111	68%
Kishore Vipperla, MD	110	68%
Jeffrey Bigler, MD	101	65%
Harvey Tatum, MD	101	65%
Michael Sutton, DO	96	63%
Vasudevan Raghuraman, MD	94	62%
Scott Hendrickson, DO	75	52%
Jeffrey Hunt, DO	73	51%
Mohamad Al-Rifai, DO	63	46%
Bernadette Lamb, MD	63	46%
Sheldon Berger, DO	24	21%
Scott Keller, MD	24	21%
Sanjay Sikka, MD	19	18%
Clayton Flanary, DO	1-10	13% or below
Trey Johnson, DO	1-10	13% or below
Abhishek Polavarapu, 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.

Ashley Scott, DO 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).