Quick answers
- Which hospitals does Mark D. Zeglis work at?
- Medicare's official clinician data lists Mark D. Zeglis at 3 hospitals: Chelsea Hospital, Trinity Health Ann Arbor Hospital and Trinity Health Livingston Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark D. Zeglis see patients?
- Medicare's clinician data lists 2 practice locations, including Ypsilanti, MI and Howell, MI. Call before your visit to confirm the address.
- What is Mark D. Zeglis's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Mark D. Zeglis accept Medicare assignment?
- Yes. Medicare's clinician data says Mark D. Zeglis 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.
- Does Mark D. Zeglis offer telehealth?
- Medicare's clinician data says Mark D. Zeglis offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark D. Zeglis?
- (734) 434-6262, as listed in official Medicare / NPI Registry data.
- What is Mark D. Zeglis's NPI number?
- 1497898233. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark D. Zeglis works
Medicare's Facility Affiliation Data lists Mark D. Zeglis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Chelsea HospitalChelsea, MI · Acute Care Hospital · CCN 230259
- Trinity Health Ann Arbor HospitalAnn Arbor, MI · Acute Care Hospital · CCN 230156
- Trinity Health Livingston HospitalBrighton, MI · Acute Care Hospital · CCN 230069
Practice locations
Addresses where Mark D. Zeglis is enrolled with Medicare (CMS data updated 2026-10-02).
- 5300 Elliott DrYpsilanti, MI 48197 (734) 434‑6262
- 620 Byron RdHowell, MI 48843 (517) 545‑5450
Group practices
Medicare enrollment lists Mark D. Zeglis as a member of this group (CMS data updated 2026-10-02).
- Huron Gastroenterology Associates PC99 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Ypsilanti
Clinicians with the same Medicare primary specialty in Ypsilanti, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Michigan Homeopathic Medical School |
| Graduation year | 2001 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1497898233 |
| 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