Brian Trethowan, MD

Primary specialty

Critical Care Medicine (Anesthesiology) PhysicianTaxonomy code 207LC0200X

License

4301111216 Issued in MI

Practice address

100 Michigan St NE
Suite 8861
Grand Rapids, MI 49503-2560

Phone

(616) 391-1774

NPI assigned

Dec 5, 2016

Last updated

Aug 27, 2026By the provider in NPPES

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: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Anesthesiology

Education

Other, 1998

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Spectrum Health Primary Care PartnersGroup PAC ID 4587568647, 2,283 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Spectrum Health Hospital, Grand Rapids, MI, CCN 230038

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: btrethowan135495@epic00.corewelldirect.org
• Direct secure messaging: btrethowan135495@epic00.shdirect.org

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

• Spectrum Health Primary Care Partners

  dba Corewell Health Medical Group West

  • Internal Medicine Physician
  • Grand Rapids, MI
  • NPI 1235188673
  Medicare reassignment Care Compare group NPD
• Spectrum Health Hospitals

  dba Corewell Health Grand Rapids Hospitals

  • Hospitalist Physician
  • Grand Rapids, MI
  • NPI 1558407189
  Medicare reassignment NPD
• Spectrum Health Hospitals

  dba Corewell Health Grand Rapids Hospital

  • General Acute Care Hospital
  • Grand Rapids, MI
  • NPI 1922090554
  NPD
• Spectrum Health Primary Care Partners

  dba Corewell Health Medical Group West

  • Internal Medicine Physician
  • Grand Rapids, MI
  • NPI 1689499667
  NPD

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

• Pennock Hospital

  dba Corewell Health Pennock Hospital

  • Critical Access Hospital
  • Hastings, MI
  • NPI 1932695525
  Care Compare affiliation
• Spectrum Health Hospitals

  dba Corewell Health Grand Rapids Hospital

  • 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": "1480896000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787788800000",
    "number": "1386188761",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "100 MICHIGAN ST NE",
            "address_2": "MC 845",
            "city": "GRAND RAPIDS",
            "state": "MI",
            "postal_code": "495032560"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 MICHIGAN ST NE",
            "address_2": "SUITE 8861",
            "city": "GRAND RAPIDS",
            "state": "MI",
            "postal_code": "495032560",
            "telephone_number": "616-391-1774"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TRETHOWAN",
        "first_name": "BRIAN",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2016-12-05",
        "last_updated": "2026-08-27",
        "certification_date": "2026-08-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207LC0200X",
            "taxonomy_group": "",
            "desc": "Anesthesiology, Critical Care Medicine",
            "state": "MI",
            "license": "4301111216",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Sarah B Trent, PTA
• Trentham Counseling LLC
• Leslie Anne Trentham, LMSW
• Brianna Karen Trepa
• Thomas Tresh, PT, DPT
• Kimberly Trevino
• Nancy Marie Trew, MSW LMSW LMFT
• Victoria Nicole Tricoche-Melton
• Justin D Triemstra, M.D.
• Daniel Savas Trierweiler, MD

• Critical Care Medicine (Anesthesiology) Physician in Grand Rapids, MI
• Providers in Grand Rapids, MI by specialty
• Critical Care Medicine (Anesthesiology) Physician in Michigan

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 27, 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.