Colonoscopy clinicians in Washington, District of Columbia

CMS lists 117 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	291	96%
Thomas Loughney, MD	265	94%
Gary Thompson, MD	223	91%
Momodu Jack, MD	219	91%
Mark Real, MD	216	90%
Javad Khalilzadeh, MD	208	90%
Michael Schindler, MD	175	85%
Jonathan Koff, MD	171	85%
Walid Chalhoub, MD	168	84%
Robert Musselman, MD	160	82%
Robert Finkel, MD	159	82%
Marie Borum, MD	157	82%
Samuel Kallus, MD	142	78%
Stephen Humm, MD	140	77%
Zaifi Shanavas, MD	135	76%
Steven Zeddun, MD	128	74%
Olaya Brewer Gutierrez, MD	127	74%
Kathryn Kirk, MD	122	72%
Paolo Peghini, MD	122	72%
Samuel Schueler, MD	122	72%
Arthur West, MD	119	71%
Danny Shearer, MD	118	71%
Ramin Farboudmanesch, MD	111	68%
John Carroll, MD	109	67%
Getachew Mekasha, MD	106	66%
Kasra Adham, MD	105	66%
Marc Kozam, MD	105	66%
Nissrin Ezmerli, MD	102	65%
Ira Shocket, MD	100	64%
Mark Mattar, MD	95	62%
Alia Dadabhai, MD	93	61%
Akriti Saxena, MD	93	61%
Alireza Meighani, MD	91	60%
Ruben Acosta, MD	89	59%
Soorya Aggarwal, MD	89	59%
Robert Schenck, MD	89	59%
Venkata Akshintala, MD	88	59%
Raena Olsen, DO	86	58%
Samer Charbel, MD	85	58%
Brian Kirsh, MD	85	58%
Zone-En Lee, MD	85	58%
James Butler, MD	84	57%
Roderick Kreisberg, MD	83	57%
Stephen Park, MD	83	57%
Kevin Collier, MD	82	56%
Joseph Jennings, MD	80	55%
Stanley Pietrak, MD	80	55%
Julio Salcedo, MD	80	55%
Richard Chasen, MD	79	54%
Joseph Genovese, MD	79	54%
Zadid Haq, MD	78	54%
Abdulhosein Adham, MD	76	53%
Erica Cohen, MD	76	53%
James Frank, MD	76	53%
Raymond Janowski, MD	76	53%
Eric Margulies, MD	76	53%
Sean Karp, MD	75	52%
Marvin Lawrence, MD	75	52%
Jeffrey Kim, MD	74	52%
Samuel Muench, MD	74	52%
Annmarie Stephenson Thomas, DO	71	50%
Aaron Fond, MD	70	50%
Megan Murphy, MD	70	50%
Shervin Shafa, MD	70	50%
Lauren George, MD	67	48%
Nikiya Asamoah-Clark, MD	66	47%
Leen Raddaoui, MD	65	47%
Dominique Howard, MD	61	45%
Ghassan Alzayer, MD	60	44%
Ramsey Daher, MD	60	44%
Antoinette Saddler, MD	59	44%
Karen Chachu	58	43%
Sumona Bhattacharya, MD	55	41%
Sanam Razeghi, MD	53	40%
Alexis McCary, MD	51	39%
Zilla Hussain, MD	50	38%
Priyanka Kanth, MD	49	38%
Barathi Sivasailam, MD	49	38%
Humimin Yu, MD	49	38%
Kirsti Campbell, MD	47	36%
Aline Charabaty Pishvaian, MD	47	36%
Nadim Haddad, MD	42	33%
Ripple Mehta, MD	42	33%
Sneha Patel, MD	41	32%
Scott Friedberg, MD	40	32%
Elham Afghani, MD	39	31%
Farshad Aduli, MD	37	30%
Margaret Keane, MD	37	30%
Annie Wong, MD	37	30%
Angesom Kibreab, MD	36	29%
Hemanth Gavini, MD	34	28%
Seema Patil, MD	34	28%
Sameer Khan, MD	31	26%
Jemilat Badamas, MD	30	25%
Michele Fischer, MD	30	25%
Bilal Ali, MD	29	25%
Angelica Nocerino, MD	29	25%
Leland Stratton, MD	27	23%
Joseph Clinton, MD	26	23%
Adeyinka Laiyemo, MD	26	23%
Caren Palese, MD	26	23%
Georgia Richards, MD	26	23%
Shandiz Shahbazi, MD	24	21%
Camille Boustani, MD	23	21%
Abdalla Khouqeer, MD	21	20%
Katherine Murphy, MD	19	18%
Sarit Kipnis, MD	18	18%
Kathleen Nilles, MD	15	16%
Zahid Vahora, MD	14	15%
Nalini Sharma, MD	13	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.

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.

Jeffrey Bernstein, MD 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).