Quick answers
- Which hospitals does William O. Humphrey work at?
- Medicare's official clinician data lists William O. Humphrey at 3 hospitals: Corewell Health Reed City Hospital, Spectrum Health and Spectrum Health United Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William O. Humphrey see patients?
- Medicare's clinician data lists 2 practice locations, including Grand Rapids, MI. Call before your visit to confirm the address.
- What is William O. Humphrey's specialty?
- Medicare lists Pathology as the primary specialty.
- Does William O. Humphrey accept Medicare assignment?
- Yes. Medicare's clinician data says William O. Humphrey 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 O. Humphrey?
- (616) 267-2660, as listed in official Medicare / NPI Registry data.
- What is William O. Humphrey's NPI number?
- 1902245467. 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 O. Humphrey works
Medicare's Facility Affiliation Data lists William O. Humphrey at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Corewell Health Reed City HospitalReed City, MI · Critical Access Hospital · CCN 231323
- Spectrum HealthGrand Rapids, MI · Acute Care Hospital · CCN 230038
- Spectrum Health United HospitalGreenville, MI · Acute Care Hospital · CCN 230035
Practice locations
Addresses where William O. Humphrey is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Michigan NE, Spectrum ButterworthGrand Rapids, MI 49503 (616) 267‑2660
- 35 Michigan St NE, Spectrum Health Reg LaboratoryGrand Rapids, MI 49503 (616) 267‑2350
Group practices
Medicare enrollment lists William O. Humphrey as a member of this group (CMS data updated 2026-10-02).
- Michigan Pathology Specialists PC32 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Grand Rapids
Clinicians with the same Medicare primary specialty in Grand Rapids, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Iowa, Rj & L Carver College Of Medicine |
| Graduation year | 2013 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902245467 |
| 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