Dr. William D. Chey, MD
Gastroenterology (Gastroenterology Physician)
- Medicare participating
At a glance
- Medical school
- Emory University School of Medicine (1986)
- Years since graduation
- 40
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 63
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1986Medical school: Emory University School of Medicine
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Gastroenterology Physician primary
MI license 4301056884 -
Internal Medicine Physician
MI license 4301056884
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- University of Michigan Health System Ann Arbor, MI
Medical groups
- Regents of the University of Michigan (3,346 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 63
- Services billed
- 108
- Patients’ average age
- 68
| Service | Times | Patients |
|---|---|---|
| Measurement of hydrogen in breath to test for stomach and bowel symptoms | 70 | 70 |
| Established patient office or other outpatient visit, 20-29 minutes | 34 | 31 |
| Established patient office or other outpatient visit, 30-39 minutes | 19 | 17 |
| Test for tone and sensation of rectum and anus | 14 | 14 |
| Study of rectum sensitivity and function | 14 | 14 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 13 | 13 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 12 | 12 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Colesevelam Hcl Other prescribers in Ann Arbor, MI | 55 |
| Omeprazole Other prescribers in Ann Arbor, MI | 42 |
| Linzess (linaclotide) Other prescribers in Ann Arbor, MI | 36 |
| Scopolamine Other prescribers in Ann Arbor, MI | 21 |
| Ondansetron Odt (ondansetron) Other prescribers in Ann Arbor, MI | 19 |
| Octreotide Acetate | 16 |
| Peg 3350-Electrolyte (sodium chloride/nahco3/kcl/peg) | 16 |
| Diphenoxylate-Atropine (diphenoxylate hcl/atropine) Other prescribers in Ann Arbor, MI | 14 |
| Mercaptopurine | 13 |
| Famotidine Other prescribers in Ann Arbor, MI | 13 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 6 companies reported 10 payments worth $2,984 in total to this clinician.
| Eli Lilly and Company | $2,250 |
|---|---|
| Anx Robotica Corp | $253 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $230 |
| Blueprint Medicines Corporation | $123 |
| Ardelyx, Inc. | $104 |
| Genzyme Corporation | $24.55 |
| Consulting Fee | $2,250 |
|---|---|
| Food and Beverage | $734 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Eli Lilly and Company Aug 21, 2025 | Consulting FeeCompany’s descriptionSERVICES TO SUPPORT RESEARCH RELATED ACTIVITIES | $1,350 |
| Eli Lilly and Company May 14, 2025 | Consulting FeeCompany’s descriptionSERVICES TO SUPPORT RESEARCH RELATED ACTIVITIES | $900 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.
Industry-funded research
Named as a principal investigator on 1 industry-funded study in 2025, from 1 company. The companies reported $2,172 in research payments for these studies, mostly to the institutions running them.
- Comparison of the Atmo Motility Gas Capsule System to the Reference Standard
Atmo Biosciences Inc · Completed · NCT05718505
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.