Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Julie Diane Hartz, M.S.

Q: What is the NPI number for Julie Hartz?

The National Provider Identifier (NPI) for Julie Hartz is 1184785339, a Type 1 (individual) record in the CMS NPPES registry.

Audiologist-Hearing Aid Fitter in Santa Rosa, CA · enumerated 2006.

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

National Provider Identifier

1184785339

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Registry record

Entity type Individual (Type 1)

Name Julie Diane Hartz

Credential M.S.

Sex Female

Practice address 3333 Mendocino Ave Ste 240, Santa Rosa, CA, 95403

Phone (707) 566-5201

Fax (707) 566-5203

Enumeration date Dec 12, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License AU847 (CA) Secondary

237600000X Audiologist-Hearing Aid Fitter Speech, Language and Hearing Service Providers · License HA2074 (CA) 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

Where does Julie Hartz practice?

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

What is the NPI number for Julie Hartz?

The National Provider Identifier (NPI) for Julie Hartz is 1184785339, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.