Quick answers
- Which hospitals does Thomas R. Gravelyn work at?
- Medicare's official clinician data lists Thomas R. Gravelyn 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 Thomas R. Gravelyn see patients?
- Medicare's clinician data lists 6 practice locations, including Brighton, MI, Pontiac, MI and Van Buren, MI. Call before your visit to confirm the address.
- What is Thomas R. Gravelyn's specialty?
- Medicare lists Sleep Medicine as the primary specialty, and also Internal Medicine.
- Does Thomas R. Gravelyn accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas R. Gravelyn 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 Thomas R. Gravelyn offer telehealth?
- Medicare's clinician data says Thomas R. Gravelyn offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Thomas R. Gravelyn?
- (734) 712-8700, as listed in official Medicare / NPI Registry data.
- What is Thomas R. Gravelyn's NPI number?
- 1760442636. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Thomas R. Gravelyn works
Medicare's Facility Affiliation Data lists Thomas R. Gravelyn 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 Thomas R. Gravelyn is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 2305 Genoa Bus Park DrBrighton, MI 48114
- 44428 Woodward Ave, Suite 102Pontiac, MI 48341 (734) 712‑8700
- 51341 W Huron River DrVan Buren, MI 48111
- 5301 E Huron River DrYpsilanti, MI 48197
- 5301 McAuley DrYpsilanti, MI 48197
Group practices
Medicare enrollment lists Thomas R. Gravelyn as a member of this group (CMS data updated 2026-10-02).
- Iha Health Services Corporation1,168 clinicians in the group
Specialties
- Sleep Medicineprimary
- Internal Medicinealso
Other sleep medicine doctors in Michigan
Clinicians with the same Medicare primary specialty in Michigan — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Michigan Medical School |
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1760442636 |
| 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