Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

William Slager

Individual provider Physician Assistant · NPI 1902360605

William Slager is a Physician Assistant in Grand Rapids, Michigan. Qualified in 2018, 8 years ago. Practices with Advantage Health/Saint Mary's Medical Group, a 494-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Michigan.

Years since qualifying
8
Licensed in
MI
In the registry since
2019
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Practice location Address checks out

235 Wealthy St SE
Grand Rapids, MI 49503-5247
Phone: (616) 840-8224
Fax: (616) 840-9690
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence 5601008991 (MI)

Record details

NPI number1902360605
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedJanuary 27, 2019
Last updated in NPPESMay 7, 2026
Certification dateMay 7, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 2018 (8 years in practice)
Group practice Advantage Health/Saint Mary'S Medical Group — 494 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients51
Services billed 94 a service is one billed item, such as a visit, a test or a procedure
Average patient age59

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Advantage Health/Saint Mary's Medical Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 494 clinicians in the practice; 12 are shown here.

Other providers in Grand Rapids