Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Gerontology Network

Q: What is the NPI number for Gerontology Network?

The NPI for Gerontology Network is 1598955510, a Type 2 (organization) record in the CMS NPPES registry.

Addiction (Substance Use Disorder) Counselor 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

1598955510

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Registry record

Entity type Organization (Type 2)

Legal business name Gerontology Network

Practice address 516 Cherry St Se, Grand Rapids, MI, 49503

Phone (616) 456-6135

Fax (616) 771-9771

Enumeration date Jul 26, 2007

Last updated in NPPES Jul 26, 2007

Taxonomy & classification

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers Primary

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 Secondary

251B00000X Case Management Agency Agencies Secondary

251S00000X Community/Behavioral Health Agency Agencies 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Gerontology Network?

The NPI for Gerontology Network is 1598955510, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Gerontology Network?

NPPES lists Thomas Hartwig (President Ceo) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-26.