Colonoscopy clinicians in Columbia, Maryland

CMS lists 46 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	253	94%
Biju Alex, MD	208	90%
Louis Salas, MD	196	88%
Kester Crosse, MD	191	87%
Joshua Rosenbloom, DO	146	79%
Neeraj Sardana, MD	139	77%
Rudrajit Rai, MD	135	76%
Thomas Abernathy, MD	117	70%
Allen Banegura, MD	110	68%
Grishma Joy, MD	109	67%
Missale Solomon, MD	107	67%
Alexander Mamunes, MD	105	66%
Eduardo Castillo Del Castillo, MD	93	61%
Alia Dadabhai, MD	93	61%
Dabo Xu, MD	90	60%
Tokunbo Ajayi, MD	86	58%
Mian Khalid, MD	84	57%
Monika Lammi, MD	80	55%
Richard Chasen, MD	79	54%
Darryn Potosky, MD	79	54%
Zadid Haq, MD	78	54%
Neil Julie, MD	78	54%
Sean Karp, MD	75	52%
Marvin Lawrence, MD	75	52%
Dhruv Lowe, MD	68	49%
Grice McMullan, MD	55	41%
Maaza Abdi, MD	54	41%
Sanam Razeghi, MD	53	40%
Monica Passi, MD	42	33%
Urooj Ahmed, MD	41	32%
Farzin Rashti, MD	39	31%
Lauren Halvorson, MD	36	29%
Pia Prakash, MD	36	29%
Thi Khuc, MD	35	28%
Seema Patil, MD	34	28%
Omer Shahab, MD	31	26%
Shaffer Mok, MD	29	25%
Joseph Clinton, MD	26	23%
Rushi Talati, MD	25	22%
Jennie Zhang, DO	24	21%
Priti Bijpuria, MD	22	20%
Robert Byrne	22	20%
Florin Selaru, MD	22	20%
Tsion Abdi, MD	20	19%
Tinsay Woreta, MD	14	15%
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.

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.

Russell Schub, DO 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).