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

Dr. John S Zimmerman, D.C., L.AC.

Family Nurse Practitioner in Diamond Bar, CA · enumerated 2006.

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

National Provider Identifier

1417985920

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Registry record

Entity type Individual (Type 1)

Name Dr. John S Zimmerman

Credential D.C., L.AC.

Sex Male

Practice address Diamond Bar, CA, 91765

Phone (909) 861-2611

Fax (909) 860-2314

Enumeration date Jun 30, 2006

Last updated in NPPES May 4, 2026

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

Taxonomy & licenses

163WG0000X General Practice Registered Nurse Nursing Service Providers · License 95212015 (CA) Secondary

171100000X Acupuncturist Other Service Providers · License 13160 (CA) Secondary

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 95039309 (CA) Primary

111N00000X Chiropractor Chiropractic Providers · License DC26261 (CA) Secondary

DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

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 specialty is John Zimmerman?

John Zimmerman is registered in NPPES with the primary taxonomy of Family Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-04.