Quick answers
- Which hospitals does James K. Mackay work at?
- Medicare's official clinician data lists James K. Mackay at 3 hospitals: Bronson Battle Creek Hospital, Bronson Lakeview Hospital and Bronson Methodist Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does James K. Mackay see patients?
- Medicare's clinician data lists 2 practice locations, including Portage, MI and Kalamazoo, MI. Call before your visit to confirm the address.
- What is James K. Mackay's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does James K. Mackay accept Medicare assignment?
- Yes. Medicare's clinician data says James K. Mackay 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 James K. Mackay's NPI number?
- 1982684320. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James K. Mackay works
Medicare's Facility Affiliation Data lists James K. Mackay at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Bronson Battle Creek HospitalBattle Creek, MI · Acute Care Hospital · CCN 230075
- Bronson Lakeview HospitalPaw Paw, MI · Critical Access Hospital · CCN 231332
- Bronson Methodist HospitalKalamazoo, MI · Acute Care Hospital · CCN 230017
Practice locations
Addresses where James K. Mackay is enrolled with Medicare (CMS data updated 2026-10-02).
- 2825 Airview BlvdPortage, MI 49002
- 601 John StKalamazoo, MI 49007
Group practices
Medicare enrollment lists James K. Mackay as a member of this group (CMS data updated 2026-10-02).
- Bronson Methodist Hospital729 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Portage
Clinicians with the same Medicare primary specialty in Portage, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1982684320 |
| 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