Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Danielle M Kozak Joy, APNP

Nurse Practitioner in San Mateo, CA · enumerated 2014.

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

National Provider Identifier

1538578059

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Registry record

Entity type Individual (Type 1)

Name Dr. Danielle M Kozak Joy

Credential APNP

Sex Female

Practice address 951 Mariners Island Blvd Ste 300, San Mateo, CA, 94404

Phone (650) 285-6927

Fax (888) 352-7383

Enumeration date Aug 8, 2014

Last updated in NPPES Apr 7, 2022

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 5908-33 (WI) Primary

Other identifiers

Identifier	Type	State	Issuer
1538578059	Medicaid	WI	-

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 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.

What specialty is Danielle Kozak Joy?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-04-07.