Colonoscopy clinicians in Columbia, Maryland

CMS lists 47 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 Columbia, Maryland (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Preston Kim, MD	224	91%
Biju Alex, MD	206	89%
Kester Crosse, MD	189	87%
Louis Salas, MD	174	85%
Rudrajit Rai, MD	156	81%
Neeraj Sardana, MD	152	80%
Joshua Rosenbloom, DO	145	79%
Thomas Abernathy, MD	125	73%
Alexander Mamunes, MD	118	70%
Grishma Joy, MD	110	68%
Missale Solomon, MD	102	65%
Dabo Xu, MD	102	65%
Tokunbo Ajayi, MD	101	64%
Allen Banegura, MD	100	64%
Neil Julie, MD	100	64%
Eduardo Castillo Del Castillo, MD	92	61%
Richard Chasen, MD	85	57%
Alia Dadabhai, MD	83	56%
Sean Karp, MD	83	56%
Darryn Potosky, MD	78	54%
Monika Lammi, MD	76	53%
Marvin Lawrence, MD	62	46%
Mian Khalid, MD	61	45%
Grice McMullan, MD	60	45%
Russell Schub, DO	58	44%
Sanam Razeghi, MD	56	42%
Zadid Haq, MD	55	42%
Dhruv Lowe, MD	54	41%
Shaffer Mok, MD	54	41%
Maaza Abdi, MD	53	41%
Farzin Rashti, MD	53	41%
Lauren Halvorson, MD	42	34%
Urooj Ahmed, MD	41	33%
Thi Khuc, MD	41	33%
Seema Patil, MD	38	31%
Monica Passi, MD	37	31%
Pia Prakash, MD	36	30%
Omer Shahab, MD	36	30%
Priti Bijpuria, MD	27	24%
Tsion Abdi, MD	22	21%
Florin Selaru, MD	22	21%
Rushi Talati, MD	21	20%
Robert Byrne	20	19%
Tinsay Woreta, MD	15	16%
Joseph Clinton, MD	12	14%
Jennie Zhang, DO	12	14%
Mateen Awan, 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).