Natalie Lorraine Siwula, PA

Primary specialty

Physician AssistantTaxonomy code 363A00000X

Practice address

1 Campus Dr
Allendale, MI 49401-9403

Phone

(616) 331-5700

Fax

(626) 331-5999

NPI assigned

Nov 25, 2024

Sex

Female

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, 2025

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Iha Health Services CorporationGroup PAC ID 2466351440, 1,149 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Trinity Health Muskegon Hospital Hospital, Muskegon, MI, CCN 230066

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.

• Iha Health Services Corporation

  • Obstetrics & Gynecology Physician
  • Canton, MI
  • NPI 1457408965
  Medicare reassignment Care Compare group
• Iha Health Service Corporation

  • Obstetrics & Gynecology Physician
  • Ypsilanti, MI
  • NPI 1831053701
  NPD
• Iha Health Services Corporation

  • Urgent Care Clinic/Center
  • Ann Arbor, MI
  • NPI 1992937023
  NPD

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

• Mercy Health Partners

  • General Acute Care Hospital
  • Muskegon, MI
  • NPI 1831132133
  Care Compare affiliation

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

{
    "created_epoch": "1732492800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785024000000",
    "number": "1487470456",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1670 E SHERMAN BLVD",
            "city": "MUSKEGON",
            "state": "MI",
            "postal_code": "494441863",
            "telephone_number": "231-672-3600"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1 CAMPUS DR",
            "city": "ALLENDALE",
            "state": "MI",
            "postal_code": "494019403",
            "telephone_number": "616-331-5700",
            "fax_number": "626-331-5999"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIWULA",
        "first_name": "NATALIE",
        "middle_name": "LORRAINE",
        "credential": "PA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2024-11-25",
        "last_updated": "2026-07-26",
        "certification_date": "2026-07-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Schulz Family Chiropractic PLLC
• Aaron James Schulz, D.C.
• Jordan Kyle Seeger
• Sensory Source, LLC
• Keegan Douglas Shannon, PT, DPT
• Haley J Slagboom, DPT
• Jessi Smith
• Solace Counseling Services
• Sonder Center for Neurodevelopment LLC
• Spectrum Health Primary Care Partners

• Physician Assistant in Allendale, MI
• Providers in Allendale, MI by specialty
• Physician Assistant in Michigan

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 26, 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.