Quick answers
- Which hospitals does Gregorio U. Tan work at?
- Medicare's official clinician data lists Gregorio U. Tan at 5 hospitals: Borgess Medical Center, Bronson Methodist Hospital, Insight Hospital and Medical Center Coldwater, Oaklawn Hospital and Three Rivers Health. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregorio U. Tan see patients?
- Medicare's clinician data lists 2 practice locations, including Kalamazoo, MI and Portage, MI. Call before your visit to confirm the address.
- What is Gregorio U. Tan's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Gregorio U. Tan accept Medicare assignment?
- Yes. Medicare's clinician data says Gregorio U. Tan 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 Gregorio U. Tan?
- (269) 226-5165, as listed in official Medicare / NPI Registry data.
- What is Gregorio U. Tan's NPI number?
- 1316926751. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregorio U. Tan works
Medicare's Facility Affiliation Data lists Gregorio U. Tan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Borgess Medical CenterKalamazoo, MI · Acute Care Hospital · CCN 230117
- Bronson Methodist HospitalKalamazoo, MI · Acute Care Hospital · CCN 230017
- Insight Hospital and Medical Center ColdwaterColdwater, MI · Acute Care Hospital · CCN 230022
- Oaklawn HospitalMarshall, MI · Acute Care Hospital · CCN 230217
- Three Rivers HealthThree Rivers, MI · Acute Care Hospital · CCN 230015
Practice locations
Addresses where Gregorio U. Tan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1521 Gull RdKalamazoo, MI 49048 (269) 226‑5165
- 7901 Angling RdPortage, MI 49024 (269) 324‑8600
Group practices
Medicare enrollment lists Gregorio U. Tan as a member of these groups (CMS data updated 2026-10-02).
- Ascension Medical Group Promed262 clinicians in the group
- Ascension Borgess Hospital37 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Michigan →
Other cardiologists in Kalamazoo
Clinicians with the same Medicare primary specialty in Kalamazoo, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1979 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1316926751 |
| 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