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

Ellen Gerken Mainthow, LMFT

Mental Health Counselor in Newport Beach, CA · enumerated 2018.

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

National Provider Identifier

1669951513

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Ellen Gerken Mainthow

Credential LMFT

Sex Female

Practice address Newport Beach, CA, 92660

Phone (949) 293-6246

Enumeration date Aug 11, 2018

Last updated in NPPES Aug 11, 2018

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 MFT27818 (CA) Primary

LMFT · Licensed Marriage and Family Therapist: A licensed therapist specializing in relational and family psychotherapy. About the LMFT 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

Where does Ellen Mainthow practice?

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

What is the NPI number for Ellen Mainthow?

The National Provider Identifier (NPI) for Ellen Mainthow is 1669951513, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-08-11.