Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Gerontology Network

Geriatric Psychiatry Physician in Grand Rapids, MI · enumerated 2007 · authorized official Thomas Hartwig, President Ceo.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1104952332

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Registry record

Entity type Organization (Type 2)

Legal business name Gerontology Network

Practice address 800 E Beltline Ave Ne, Grand Rapids, MI, 49525

Phone (616) 456-6135

Enumeration date Feb 23, 2007

Last updated in NPPES May 2, 2008

Taxonomy & classification

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians Secondary

2084P0805X Geriatric Psychiatry Physician Allopathic & Osteopathic Physicians Primary

251B00000X Case Management Agency Agencies Secondary

261QA0600X Adult Day Care Clinic/Center Ambulatory Health Care Facilities Secondary

Authorized official

Name Thomas Hartwig

Title President Ceo

Phone (616) 456-6135

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Where is Gerontology Network located?

The practice location on file with NPPES is in Grand Rapids, MI.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-05-02. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-05-02.