Colonoscopy clinicians in Bee Cave, Texas

CMS lists 8 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 Bee Cave, Texas (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Benjamin Havemann, MD	452	99%
John Tsai, MD	242	93%
Daniel Emmett, MD	205	89%
Sheila Reddy, MD	176	85%
Erik Rahimi, MD	114	69%
Dan Cohen, MD	106	66%
Kristen Ankrom, MD	78	54%
Eimile Dalton, MD	65	47%

Sorted by the number of colonoscopies billed to Medicare, highest first, not by quality or skill.

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).