Quick answers
- Which hospitals does Trey Rottgen work at?
- Medicare's official clinician data lists Trey Rottgen at 1 hospital: University of Michigan Health System. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Trey Rottgen see patients?
- Medicare's clinician data lists 1 practice location in Ann Arbor, MI. Call before your visit to confirm the address.
- What is Trey Rottgen's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Trey Rottgen accept Medicare assignment?
- Yes. Medicare's clinician data says Trey Rottgen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Trey Rottgen?
- (734) 936-4000, as listed in official Medicare / NPI Registry data.
- What is Trey Rottgen's NPI number?
- 1013534932. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Trey Rottgen works
Medicare's Facility Affiliation Data lists Trey Rottgen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- University of Michigan Health SystemAnn Arbor, MI · Acute Care Hospital · CCN 230046
Practice locations
Addresses where Trey Rottgen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1500 E Medical Ctr DrAnn Arbor, MI 48109 (734) 936‑4000
Group practices
Medicare enrollment lists Trey Rottgen as a member of this group (CMS data updated 2026-10-02).
- Regents of the University of Michigan3,346 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Ann Arbor
Clinicians with the same Medicare primary specialty in Ann Arbor, MI — not a recommendation.
Clinician information
| Graduation year | 2020 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1013534932 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians