SurgeryVolume Find a doctor

Chad Cornish, MD

As reported to Medicare

Credential
MD
Primary specialty
Gastroenterology
Medical school graduation
2009
National Provider Identifier (NPI)
1396989869
Practice location

Burnt Hills, New York

Source: Centers for Medicare & Medicaid Services

# of Colonoscopies Billed to Medicare
137

Total number of colonoscopies this clinician billed to Medicare in the most recent 12-month claims period, according to CMS.

Percentile Rank (%)
77%

Percentile rank of 137 colonoscopies compared to other clinicians with a primary specialty of Gastroenterology, Internal Medicine, Family Practice, or General Practice who have billed Medicare for at least one colonoscopy in the same period.

The figures above reflect only procedures that this clinician billed to Medicare, according to CMS. Therefore, they may not reflect the total number of procedures this clinician performed during the 12-month reporting period. See Understanding CMS Data below.

Source: Centers for Medicare & Medicaid Services (October 2, 2026 release).

Chad Cornish's Colonoscopy Billing Volume Compared to Peers

0% 20% 40% 60% 80% 100% 0 1-10 29 25th pct. 70 Median 130 75th pct. 1,538 Highest This clinician Volume: 137 Percentile Rank: 77% # of Colonoscopies Billed to Medicare Percentile Rank (%) 0% 20% 40% 60% 80% 100% 0 1-10 29 25th pct. 70 Median 130 75th pct. 1,538 Highest This clinician Volume: 137 Percentile Rank: 77% # of Colonoscopies Billed to Medicare Percentile Rank (%)

Reading the curve: find a volume along the bottom, and the line gives the percentile of clinicians with a primary specialty of Gastroenterology, Internal Medicine, Family Practice, or General Practice at or below it. The marked point is this clinician. The shaded block covers the 2,202 clinicians CMS reports as 1-10, because CMS suppresses counts below 11.

Source: Centers for Medicare & Medicaid Services (October 2, 2026 release).

Previous data releases

The table shows this clinician's figures from each CMS data release.

CMS data release Colonoscopies billed Percentile rank
October 2, 2026 Current 137 77%
August 18, 2026 Prior 127 73%
August 11, 2026 Prior 127 73%
June 26, 2026 Prior 91 72%

CMS does not publish the start and end dates of the window behind any release, and consecutive releases may cover overlapping periods, or the same period with later-arriving claims added.

Understanding CMS Data

This count includes 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 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.

We use CMS's percentile formula with a narrower comparison group than CMS's own, so our percentile can differ from the one CMS publishes.

How CMS counts colonoscopies, and how we calculate the percentile