Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. Michael John Gillen, M.S.W.
Social Worker in Grand Rapids, MI · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1649301276
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Registry record
Entity type Individual (Type 1)
Name Mr. Michael John Gillen
Credential M.S.W.
Sex Male
Practice address 3949 Sparks Dr Se Ste 103, Grand Rapids, MI, 49546
Phone (616) 957-5850
Fax (616) 957-5853
Enumeration date Mar 7, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License 6801085857 (MI) Primary
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.
Frequently asked questions
What is the NPI number for Michael Gillen?
The National Provider Identifier (NPI) for Michael Gillen is 1649301276, a Type 1 (individual) record in the CMS NPPES registry.
Where does Michael Gillen practice?
The practice location on file with NPPES is in Grand Rapids, MI. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.