Quick answers
- Which hospitals does William Mackin work at?
- Medicare's official clinician data lists William Mackin at 4 hospitals: Cheyenne Regional Medical Center, Lakeland Hospital, St Joseph, The Medical Center (Bowling Green) and Tristar Greenview Regional Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Mackin see patients?
- Medicare's clinician data lists 1 practice location in Saint Joseph, MI. Call before your visit to confirm the address.
- What is William Mackin's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does William Mackin accept Medicare assignment?
- Yes. Medicare's clinician data says William Mackin 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 William Mackin?
- (269) 985-1000, as listed in official Medicare / NPI Registry data.
- What is William Mackin's NPI number?
- 1215924949. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William Mackin works
Medicare's Facility Affiliation Data lists William Mackin at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Cheyenne Regional Medical CenterCheyenne, WY · Acute Care Hospital · CCN 530014
- Lakeland Hospital, St JosephSt Joseph, MI · Acute Care Hospital · CCN 230021
- The Medical Center (Bowling Green)Bowling Green, KY · Acute Care Hospital · CCN 180013
- Tristar Greenview Regional HospitalBowling Green, KY · Acute Care Hospital · CCN 180124
Practice locations
Addresses where William Mackin is enrolled with Medicare (CMS data updated 2026-10-02).
- 3950 Hollywood RdSaint Joseph, MI 49085 (269) 985‑1000
Group practices
Medicare enrollment lists William Mackin as a member of this group (CMS data updated 2026-10-02).
- Lakeland Hospitals at Niles and St Joseph Inc131 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Michigan →
Other cardiologists in Saint Joseph
Clinicians with the same Medicare primary specialty in Saint Joseph, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Temple University School Of Medicine |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1215924949 |
| 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