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

Mrs. Arielle Elizabeth Monteilh

Mental Health Counselor in Ontario, CA · enumerated 2021.

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

National Provider Identifier

1134717150

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Registry record

Entity type Individual (Type 1)

Name Mrs. Arielle Elizabeth Monteilh

Sex Female

Practice address Ontario, CA, 91764

Phone (909) 458-1517

Fax (909) 944-2917

Enumeration date Jan 5, 2021

Last updated in NPPES Jan 5, 2021

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

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 89369 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
89369	Medicaid	CA	-

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 Arielle Monteilh?

The National Provider Identifier (NPI) for Arielle Monteilh is 1134717150, a Type 1 (individual) record in the CMS NPPES registry.

Where does Arielle Monteilh practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-01-05.