Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Diana M Johns, MD

Q: What is the NPI number for Diana Johns?

The National Provider Identifier (NPI) for Diana Johns is 1639213564, a Type 1 (individual) record in the CMS NPPES registry.

Occupational Medicine Physician in Milpitas, CA · enumerated 2007.

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

National Provider Identifier

1639213564

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Registry record

Entity type Individual (Type 1)

Name Dr. Diana M Johns

Credential MD

Sex Female

Practice address 1717 S Main St, Milpitas, CA, 95035

Phone (408) 957-5700

Fax (408) 957-5715

Enumeration date Feb 16, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

2083X0100X Occupational Medicine Physician Allopathic & Osteopathic Physicians · License C041091 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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 is the NPI number for Diana Johns?

The National Provider Identifier (NPI) for Diana Johns is 1639213564, a Type 1 (individual) record in the CMS NPPES registry.

Where does Diana Johns practice?

The practice location on file with NPPES is in Milpitas, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.