Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. Christopher Thomas Witmer, MPA

Social Worker in Grand Rapids, MI · enumerated 2006.

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

National Provider Identifier

1629130943

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Registry record

Entity type Individual (Type 1)

Name Mr. Christopher Thomas Witmer

Credential MPA

Sex Male

Practice address Grand Rapids, MI, 49546

Phone (616) 248-5134

Fax (616) 301-8018

Enumeration date Dec 14, 2006

Last updated in NPPES Apr 6, 2016

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1629130943 active?

Yes, as of the latest NPPES snapshot, NPI 1629130943 is active (record last updated 2016-04-06).

How do I verify Christopher Witmer's NPI record?

Cross-check NPI 1629130943 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-04-06.