Colonoscopy clinicians in Billings, Montana

CMS lists 38 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 Billings, Montana (details below).

Colonoscopy volume

Clinician	Colonoscopies billed	Percentile rank
Michael Fischer, MD	311	96%
Reed Hogan, MD	291	96%
Richard Heard, MD	288	95%
James Underwood, MD	264	94%
Michelle Petro, MD	260	94%
Pierce Dotherow, MD	257	94%
Keri Hill, MD	221	91%
Jane Claire Williams, MD	200	88%
Yevgeniy Arefiev, MD	198	88%
Steven Hammond, MD	196	88%
Reed Hogan, MD	195	88%
Ernest Williams, MD	194	88%
David Bridgers, MD	187	87%
Mark Wilson, MD	186	87%
Wen Huan Ho, MD	173	85%
Charles Hall, MD	156	81%
Kim Almodovar, MD	154	81%
Stephen Baum, MD	153	81%
Andrew Gentry, MD	144	79%
Ralph Vance, MD	144	79%
Ernest Weeks, MD	134	76%
Robert Anderson, MD	124	73%
Stewart Boyd, MD	117	70%
Paul Dotherow, MD	116	70%
John McKee, MD	75	52%
Russ Arjal, MD	65	47%
Shuja Yousuf, MD	61	45%
Rushikesh Shah, MD	49	38%
Nathaniel Spezia-Lindner, MD	45	36%
Andrei Gasic, MD	42	34%
Alexander Mantas, MD	28	25%
Anupama Mathew, MD	28	25%
Crystal Bernstein, MD	26	23%
Christie Mannino, MD	14	15%
Raj Shah, MD	12	14%
Abdullah Al-Shahrani, MD	1-10	13% or below
Nirmal Singh, MD	1-10	13% or below
Sachin Wani, 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).