William Slager

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

5601008991 Issued in MI

Practice address

235 Wealthy St SE
Grand Rapids, MI 49503-5247

Phone

(616) 840-8224

Fax

(616) 840-9690

NPI assigned

Jan 27, 2019

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in MI

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Physician Assistant

Education

Other, 2018

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Advantage Health/Saint Mary'S Medical GroupGroup PAC ID 4082807961, 499 clinicians

Mary Free Bed Rehabilitation HospitalGroup PAC ID 4587576541, 135 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Mercy Health Saint Mary'S Hospital, Grand Rapids, MI, CCN 230059
• Spectrum Health Hospital, Grand Rapids, MI, CCN 230038

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Mary Free Bed Rehabilitation Hospital

  • Rehabilitation Hospital
  • Grand Rapids, MI
  • NPI 1730133463
  Medicare reassignment Care Compare group NPD
• Advantage Health/Saint Mary'S Medical Group

  • Multi-Specialty Clinic/Center
  • Grand Rapids, MI
  • NPI 1376862151
  Medicare reassignment Care Compare group
• Advantage Health Saint Mary'S Medical Group

  • Orthopaedic Surgery Physician
  • Byron Center, MI
  • NPI 1003515008

  Physician Assistant

  NPD
• Advantage Health Saint Mary'S Medical Group

  • Multi-Specialty Clinic/Center
  • Grand Rapids, MI
  • NPI 1952340911
  NPD
• Mary Free Bed Rehabilitation Hospital

  • Physical Medicine & Rehabilitation Physician
  • Grand Rapids, MI
  • NPI 1053641589
  NPD
• West Shore Cardiology, PLC

  • Cardiovascular Disease Physician
  • Muskegon, MI
  • NPI 1073528642
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Pennock Hospital

  • Critical Access Hospital
  • Hastings, MI
  • NPI 1932695525
  Care Compare affiliation
• Saint Mary'S Health Services

  • General Acute Care Hospital
  • Grand Rapids, MI
  • NPI 1639111057
  Care Compare affiliation
• Spectrum Health Hospitals

  • General Acute Care Hospital
  • Grand Rapids, MI
  • NPI 1922090554
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1548547200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778112000000",
    "number": "1902360605",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "235 WEALTHY ST SE",
            "city": "GRAND RAPIDS",
            "state": "MI",
            "postal_code": "495035247",
            "telephone_number": "616-840-8224",
            "fax_number": "616-840-9690"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "235 WEALTHY ST SE",
            "city": "GRAND RAPIDS",
            "state": "MI",
            "postal_code": "495035247",
            "telephone_number": "616-840-8224",
            "fax_number": "616-840-9690"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SLAGER",
        "first_name": "WILLIAM",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-01-27",
        "last_updated": "2026-05-07",
        "certification_date": "2026-05-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MI",
            "license": "5601008991",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Philip Scott Slachter, LMSW
• Lisa Marie Sladek, O.D.
• Hien T Slagel, PHARM. D.
• Dianne Slager, FNP
• Tracy Norris Slager, LPC
• Mitike Slagstad
• Angela Slagter, DNP
• Sabrina Kaye Slagter, LPC
• Jason D. Slaikeu, MD
• Bethany Ann Slane, M.S.W.

• Physician Assistant in Grand Rapids, MI
• Providers in Grand Rapids, MI by specialty
• Physician Assistant in Michigan

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 7, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.