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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

WILLIAM ZIMMER RSW
NPI 1386601078
Social Worker in Charlotte, MI

Active since April 27, 2006
551 COURTHOUSE DR, CHARLOTTE, MI 48813(517) 543-5100(517) 346-8291 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About William Zimmer Rsw NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM ZIMMER RSW (NPI 1386601078) is an individual social worker in Charlotte, Michigan, licensed in Michigan (6801063132) and active in the NPI registry since April 2006.

NPPES Registry Identity

NPI1386601078
Entity TypeIndividualMale
Primary Taxonomy104100000X
Provider Legal NameWILLIAM ZIMMERCredential: RSW
Location Address551 COURTHOUSE DRCharlotte, MI 48813-1054
Mailing Address812 E Jolly Rd, Ste 210Lansing, MI 48910-6818 · (517) 346-8410 · Fax (517) 346-8291
Phone(517) 543-5100
Fax(517) 346-8291
Sole ProprietorNo
Enumeration DateApril 27, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1386601078 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial WorkerBehavioral Health & Social Service Providers
Taxonomy Code104100000X
License✔ Licensed in MI · 6801063132
Definition
A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.
551 COURTHOUSE DR, Charlotte, MI 48813
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Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SANDRA K COOK-LASS LBSW
Social Worker
551 COURTHOUSE DR
CHARLOTTE, MI 48813
Eaton County (517) 543-5100
SCOTT DAVID STRUCK FLP
Psychologist
551 COURTHOUSE DR
CHARLOTTE, MI 48813
Eaton County (517) 543-5100
LINA BRELAND LLMSW
Social Worker (Clinical)
551 COURTHOUSE DR
CHARLOTTE, MI 48813
Eaton County (517) 543-5100
RONALD KOSTKA CSW
Social Worker (Clinical)
551 COURTHOUSE DR, STE 5
CHARLOTTE, MI 48813
Eaton County (517) 543-5100

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Zimmer's NPI number?

The NPI number for William Zimmer is 1386601078. It was assigned to this individual provider in the NPPES registry on April 27, 2006.

Where is William Zimmer located?

William Zimmer practices at 551 Courthouse Dr, Charlotte, MI 48813. The listed phone number is (517) 543-5100.

What is William Zimmer's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

When was this NPI record last updated?

The NPPES record for William Zimmer was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.