Dr. Michael C. Duffy, MD
Gastroenterology (Gastroenterology Physician)
- Medicare participating
At a glance
- Medical school
- Louisiana State University School of Medicine in New Orleans (1974)
- Years since graduation
- 52
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 871
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
- 1974Medical school: Louisiana State University School of Medicine in New Orleans
- 2005Registered 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 052312
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Beaumont Hospital Royal Oak Royal Oak, MI
- Beaumont Hospital, Troy Troy, MI
- Beaumont Hospital - Farmington Hills Farmington Hills, MI
Medical groups
- Beaumont Medical Group- Specialty Services (847 clinicians)
- Gastrointestinal Specialists PC (16 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
- 871
- Services billed
- 5,274
- Patients’ average age
- 74
| Service | Times | Patients |
|---|---|---|
| Pathology examination of tissue using a microscope, intermediate complexity | 527 | 286 |
| Established patient office or other outpatient visit, 20-29 minutes | 268 | 220 |
| Established patient office or other outpatient visit, 30-39 minutes | 156 | 130 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 99 | 54 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 96 | 95 |
| New patient office or other outpatient visit, 45-59 minutes | 80 | 80 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 52 | 50 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 48 | 48 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 47 | 46 |
| Biopsy of large bowel using a flexible endoscope | 42 | 42 |
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 |
|---|---|
| Omeprazole Other prescribers in Troy, MI | 739 |
| Pantoprazole Sodium Other prescribers in Troy, MI | 158 |
| Dicyclomine Hcl Other prescribers in Troy, MI | 77 |
| Lansoprazole Other prescribers in Troy, MI | 72 |
| Mesalamine Other prescribers in Troy, MI | 66 |
| Rabeprazole Sodium Other prescribers in Troy, MI | 32 |
| Hydrocortisone Other prescribers in Troy, MI | 28 |
| Creon (lipase/protease/amylase) Other prescribers in Troy, MI | 28 |
| Budesonide Dr (budesonide) Other prescribers in Troy, MI | 27 |
| Linzess (linaclotide) Other prescribers in Troy, MI | 26 |
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, 2 companies reported 4 payments worth $165 in total to this clinician.
| Janssen Biotech, Inc. | $139 |
|---|---|
| AbbVie Inc. | $26.30 |
| Education | $99.99 |
|---|---|
| Food and Beverage | $65.17 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Janssen Biotech, Inc. Jul 8, 2025 | Education TREMFYA · Immunology · in-kind | $99.99 |
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.