Quick answers
- Which hospitals does Corey M. Obrien work at?
- Medicare's official clinician data lists Corey M. Obrien at 3 hospitals: Edward W Sparrow Hospital, University of Michigan Health - Sparrow Eaton and University of Michigan Health- Sparrow Clinton. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Corey M. Obrien see patients?
- Medicare's clinician data lists 10 practice locations, including Lansing, MI, Charlotte, MI and Ionia, MI. Call before your visit to confirm the address.
- What is Corey M. Obrien's specialty?
- Medicare lists Pulmonary Disease as the primary specialty, and also Critical Care (Intensivists).
- Does Corey M. Obrien accept Medicare assignment?
- Yes. Medicare's clinician data says Corey M. Obrien 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 Corey M. Obrien?
- (269) 588-1994, as listed in official Medicare / NPI Registry data.
- What is Corey M. Obrien's NPI number?
- 1437321213. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Corey M. Obrien works
Medicare's Facility Affiliation Data lists Corey M. Obrien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Edward W Sparrow HospitalLansing, MI · Acute Care Hospital · CCN 230230
- University of Michigan Health - Sparrow EatonCharlotte, MI · Critical Access Hospital · CCN 231327
- University of Michigan Health- Sparrow ClintonSaint Johns, MI · Critical Access Hospital · CCN 231326
Practice locations
Addresses where Corey M. Obrien is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 10; the Medicare profile lists all.
Group practices
Medicare enrollment lists Corey M. Obrien as a member of this group (CMS data updated 2026-10-02).
- Edward W Sparrow Hospital Association730 clinicians in the group
Specialties
Other pulmonologists in Lansing
Clinicians with the same Medicare primary specialty in Lansing, MI — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Arizona College Of Osteopathic Medicine Mid Western University |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437321213 |
| 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