Colonoscopy clinicians in Washington, District of Columbia

CMS lists 118 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 Washington, District of Columbia (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Saowanee Ngamruengphong, MD	265	94%
Thomas Loughney, MD	262	94%
Gary Thompson, MD	236	92%
Momodu Jack, MD	229	92%
Mark Real, MD	218	91%
Javad Khalilzadeh, MD	204	89%
Jonathan Koff, MD	176	85%
Marie Borum, MD	165	83%
Walid Chalhoub, MD	163	83%
Michael Schindler, MD	163	83%
Robert Finkel, MD	160	82%
Robert Musselman, MD	140	77%
Olaya Brewer Gutierrez, MD	129	74%
Stephen Humm, MD	126	73%
Kathryn Kirk, MD	126	73%
Ira Shocket, MD	122	72%
Marc Kozam, MD	118	70%
John Carroll, MD	117	70%
Zaifi Shanavas, MD	116	70%
Steven Zeddun, MD	115	69%
Samuel Schueler, MD	114	69%
Ramin Farboudmanesch, MD	113	69%
Samuel Kallus, MD	110	68%
Brian Kirsh, MD	109	67%
Paolo Peghini, MD	108	67%
Danny Shearer, MD	108	67%
Getachew Mekasha, MD	106	66%
Arthur West, MD	104	66%
Kasra Adham, MD	103	65%
Nissrin Ezmerli, MD	102	65%
Venkata Akshintala, MD	99	64%
Alireza Meighani, MD	99	64%
James Butler, MD	92	61%
Raena Olsen, DO	91	60%
Robert Schenck, MD	91	60%
Mark Mattar, MD	90	60%
Ruben Acosta, MD	89	59%
Akriti Saxena, MD	88	59%
Samer Charbel, MD	86	58%
Richard Chasen, MD	85	57%
Alia Dadabhai, MD	83	56%
Sean Karp, MD	83	56%
Julio Salcedo, MD	83	56%
Abdulhosein Adham, MD	82	56%
Soorya Aggarwal, MD	82	56%
Kevin Collier, MD	81	55%
Joseph Jennings, MD	81	55%
Ghassan Alzayer, MD	80	55%
Aaron Fond, MD	80	55%
Sumona Bhattacharya, MD	79	54%
Stanley Pietrak, MD	79	54%
Humimin Yu, MD	79	54%
Erica Cohen, MD	77	54%
Joseph Genovese, MD	75	52%
Samuel Muench, MD	74	52%
Jeffrey Kim, MD	73	51%
Zone-En Lee, MD	73	51%
Megan Murphy, MD	72	51%
Leen Raddaoui, MD	72	51%
Shervin Shafa, MD	72	51%
Nikiya Asamoah-Clark, MD	71	50%
James Frank, MD	71	50%
Raymond Janowski, MD	71	50%
Annmarie Stephenson Thomas, DO	71	50%
Kirsti Campbell, MD	70	50%
Aline Charabaty Pishvaian, MD	65	47%
Lauren George, MD	65	47%
Karen Chachu	63	46%
Marvin Lawrence, MD	62	46%
Stephen Park, MD	61	45%
Roderick Kreisberg, MD	60	45%
Sanam Razeghi, MD	56	42%
Zadid Haq, MD	55	42%
Antoinette Saddler, MD	55	42%
Dominique Howard, MD	54	41%
Zilla Hussain, MD	51	39%
Ramsey Daher, MD	49	38%
Farshad Aduli, MD	48	38%
Hemanth Gavini, MD	48	38%
Angesom Kibreab, MD	48	38%
Sneha Patel, MD	46	36%
Nadim Haddad, MD	43	34%
Eric Margulies, MD	42	34%
Priyanka Kanth, MD	40	33%
Elham Afghani, MD	39	32%
Margaret Keane, MD	38	31%
Seema Patil, MD	38	31%
Caren Palese, MD	36	30%
Leland Stratton, MD	36	30%
Alexis McCary, MD	35	29%
Barathi Sivasailam, MD	35	29%
Angelica Nocerino, MD	34	29%
Annie Wong, MD	34	29%
Ripple Mehta, MD	33	28%
Scott Friedberg, MD	31	27%
Jemilat Badamas, MD	30	26%
Sameer Khan, MD	28	25%
Bilal Ali, MD	26	23%
Georgia Richards, MD	26	23%
Shandiz Shahbazi, MD	25	23%
Sarit Kipnis, MD	20	19%
Abdalla Khouqeer, MD	16	17%
Adeyinka Laiyemo, MD	16	17%
Zahid Vahora, MD	16	17%
Jeffrey Bernstein, MD	13	15%
Kathleen Nilles, MD	13	15%
Joseph Clinton, MD	12	14%
Michele Fischer, MD	12	14%
Katherine Murphy, MD	12	14%
Nalini Sharma, MD	12	14%
Jennie Zhang, DO	12	14%
Ameer Abutaleb, MD	1-10	13% or below
Folabomi Ajanaku, MD	1-10	13% or below
Ruhail Kohli, MD	1-10	13% or below
Filipa Ligeiro, MD	1-10	13% or below
Adrienne Nguyen, MD	1-10	13% or below
William Park, MD	1-10	13% or below
Amol Rangnekar, 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).