Quick answers
- Which hospitals does Jeffrey Thewes work at?
- Medicare's official clinician data lists Jeffrey Thewes at 2 hospitals: McLaren Bay Region and McLaren Greater Lansing. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jeffrey Thewes see patients?
- Medicare's clinician data lists 3 practice locations, including Lansing, MI, Madison Heights, MI and Oxford, MI. Call before your visit to confirm the address.
- What is Jeffrey Thewes's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Jeffrey Thewes accept Medicare assignment?
- Yes. Medicare's clinician data says Jeffrey Thewes 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 Jeffrey Thewes?
- (517) 975-7500, as listed in official Medicare / NPI Registry data.
- What is Jeffrey Thewes's NPI number?
- 1649329418. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jeffrey Thewes works
Medicare's Facility Affiliation Data lists Jeffrey Thewes at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- McLaren Bay RegionBay City, MI · Acute Care Hospital · CCN 230041
- McLaren Greater LansingLansing, MI · Acute Care Hospital · CCN 230167
Practice locations
Addresses where Jeffrey Thewes is enrolled with Medicare (CMS data updated 2026-10-02).
- 2900 Collins RdLansing, MI 48910 (517) 975‑7500
- 31005 John R Rd, Suite AMadison Heights, MI 48071 (248) 850‑8306
- 385 N Lapeer RdOxford, MI 48371 (248) 628‑3000
Group practices
Medicare enrollment lists Jeffrey Thewes as a member of these groups (CMS data updated 2026-10-02).
- McLaren Hospital Group375 clinicians in the group
- McLaren Medical Group213 clinicians in the group
- Medpro Urgent Care PLLC9 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Lansing
Clinicians with the same Medicare primary specialty in Lansing, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgetown University School Of Medicine |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649329418 |
| 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