Colonoscopy clinicians in San Antonio, Texas

CMS lists 71 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 San Antonio, Texas (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Russell Havranek, MD	273	95%
Ernesto Guerra, MD	245	93%
Gary Gossen, MD	233	92%
Joseph Johnson, MD	230	92%
David Jones, DO	226	91%
Jeff Bullock, MD	205	89%
Charles Randall	202	89%
Richard Otero, MD	197	88%
Antonio Serna, MD	185	86%
Kevin Franklin, MD	177	85%
James Alvarez, MD	142	78%
Emuejevoke Okoh, MD	140	77%
Harsh Patel, MD	135	76%
Marco Bustamante Bernal, MD	134	76%
Joycelyn Theard, MD	131	75%
Roberto Ponce, MD	113	69%
Gregg Wendorf, MD	110	68%
Bassem Mazloum, MD	109	67%
Abhishek Challa, MD	105	66%
Eddie Flores, MD	104	66%
Balaji Ayyar, MD	103	65%
Nicholas Martinez, MD	102	65%
John Vizuete, MD	102	65%
Mark Cossentino, MD	101	64%
Alfredo Chavez, MD	93	61%
Elissa Lin, MD	90	60%
Bijo John, MD	89	59%
Victor Zurita, MD	89	59%
Desh Sharma, MD	84	57%
Laura Rosenkranz, MD	83	56%
Amit Goyal, MD	79	54%
John Alvarez, MD	78	54%
Babusai Rapaka, MD	69	49%
Jason Rocha, MD	66	48%
Chaithanya Mallikarjun, MD	65	47%
Obinna Ukabam, MD	55	42%
Randy Wright, MD	49	38%
Meher Sindhoora Mavuram, MD	48	38%
Orestes Moldes-Rodriguez, MD	48	38%
Seema Dar, MD	47	37%
Mohammad Taheri, MD	46	36%
Rajat Garg, MD	44	35%
Ruben Ramirez, MD	42	34%
Charles Miller, MD	41	33%
Alexis Pavle, MD	35	29%
Juan Echavarria, MD	29	25%
Allison Sirakos, MD	26	23%
Prabhleen Chahal, MD	22	21%
Souleymane Diallo, DO	20	19%
Sandeep Patel, MD	20	19%
Mahesh Gajendran, MD	18	18%
Paul Kaimakliotis, MD	16	17%
Andres Gomez-Aldana, MD	15	16%
Pradeep Yarra, MD	14	15%
Karolina Dziadkowiec, MD	13	15%
Sarah Marucci, MD	12	14%
Kamran Safdar, MD	11	13%
Hopethe Baker, MD	1-10	13% or below
John Dickson, MD	1-10	13% or below
Leo Edwards, MD	1-10	13% or below
Angel Gonzalez, MD	1-10	13% or below
Omer Junaidi, MD	1-10	13% or below
Gabriel Magraner, MD	1-10	13% or below
Albert Manudhane, MD	1-10	13% or below
Fernando Membreno, MD	1-10	13% or below
Madhavi Rudraraju, MD	1-10	13% or below
Hari Sayana, MD	1-10	13% or below
Patrick Snyder, MD	1-10	13% or below
Qingguo Tao, MD	1-10	13% or below
Kavitha Thudi, MD	1-10	13% or below
Eugenia Tsai, 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).