Colonoscopy clinicians in Tulsa, Oklahoma

CMS lists 37 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	239	93%
Matt Blankenship, MD	218	91%
Kevin McNamara, MD	210	90%
Michael Martin, MD	205	89%
William Briggs, MD	201	89%
John Hood, MD	187	87%
Febin John, MD	175	85%
Andrew Crawford, DO	168	84%
Markham Nightengale, MD	167	84%
Brandon Conkling, DO	158	82%
Amjad Mreyoud, MD	145	79%
Richard Jesudass, MD	142	78%
Geoffrey Fillmore, DO	128	74%
Eric Cottrill, MD	126	73%
Michael Warren, DO	123	72%
Christopher Lynch, MD	122	72%
Jeffery Blonsky, MD	120	71%
Roy Thompson, MD	115	69%
Dushyant Singh, MD	109	67%
Aaron Fieker, DO	106	66%
Robert Aran, DO	104	66%
Sarah Oberste, DO	103	65%
Vasudevan Raghuraman, MD	102	65%
Kishore Vipperla, MD	102	65%
Jeffrey Bigler, MD	85	57%
Harvey Tatum, MD	84	57%
David Meehan, DO	83	56%
Scott Hendrickson, DO	81	55%
Jeffrey Hunt, DO	80	55%
Mohamad Al-Rifai, DO	53	41%
Sheldon Berger, DO	48	38%
Bernadette Lamb, MD	35	29%
Sanjay Sikka, MD	29	25%
Scott Keller, MD	22	21%
Clayton Flanary, DO	1-10	13% or below
Trey Johnson, DO	1-10	13% or below
Ashley Scott, DO	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).