Quick answers
- Which hospitals does Nicholas Hartog work at?
- Medicare's official clinician data lists Nicholas Hartog at 2 hospitals: Corewell Health Ludington Hospital and Spectrum Health. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nicholas Hartog see patients?
- Medicare's clinician data lists 4 practice locations, including Grand Rapids, MI and Kentwood, MI. Call before your visit to confirm the address.
- What is Nicholas Hartog's specialty?
- Medicare lists Allergy/Immunology as the primary specialty.
- Does Nicholas Hartog accept Medicare assignment?
- Yes. Medicare's clinician data says Nicholas Hartog 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.
- Does Nicholas Hartog offer telehealth?
- Medicare's clinician data says Nicholas Hartog offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Nicholas Hartog?
- (616) 267-0115, as listed in official Medicare / NPI Registry data.
- What is Nicholas Hartog's NPI number?
- 1669766325. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nicholas Hartog works
Medicare's Facility Affiliation Data lists Nicholas Hartog at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Corewell Health Ludington HospitalLudington, MI · Acute Care Hospital · CCN 230110
- Spectrum HealthGrand Rapids, MI · Acute Care Hospital · CCN 230038
Practice locations
Addresses where Nicholas Hartog is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Michigan Ave NEGrand Rapids, MI 49503
- 100 Michigan St NE Rm, 280 Corewell Health Medical Group WestGrand Rapids, MI 49503 (616) 267‑0115
- 3271 Clear Vista Ct NE, Corewell Health Medical Group WestGrand Rapids, MI 49525 (616) 267‑7293
- 4444 Kalamazoo Ave SE, 200 Corewell Health Medical Group WestKentwood, MI 49508 (616) 391‑5600
Group practices
Medicare enrollment lists Nicholas Hartog as a member of this group (CMS data updated 2026-10-02).
- Spectrum Health Primary Care Partners2,294 clinicians in the group
Specialties
- Allergy/Immunologyprimary
Other allergist and immunologists in Grand Rapids
Clinicians with the same Medicare primary specialty in Grand Rapids, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 2011 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1669766325 |
| 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