Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Joanna Gillis Licensed Clinical Social Worker Gillis Therapy Group Inc

Clinical Social Worker in Century City, CA · enumerated 2022 · authorized official Michael Ferner, Office Manager.

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

National Provider Identifier

1578216891

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Registry record

Entity type Organization (Type 2)

Legal business name Joanna Gillis Licensed Clinical Social Worker Gillis Therapy Group Inc

Other name <Unavail>

Practice address 2080 Century Park E Ste 1406, Century City, CA, 90067

Phone (424) 394-0295

Enumeration date Jan 27, 2022

Last updated in NPPES Feb 15, 2022

Taxonomy & classification

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers Primary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers Secondary

Authorized official

Name Michael Ferner

Title Office Manager

Phone (424) 394-0312

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

Who is the authorized official for Joanna Gillis Licensed Clinical Social Worker Gillis Therapy Group Inc?

NPPES lists Michael Ferner (Office Manager) as the authorized official for this organization.

What is the NPI number for Joanna Gillis Licensed Clinical Social Worker Gillis Therapy Group Inc?

The NPI for Joanna Gillis Licensed Clinical Social Worker Gillis Therapy Group Inc is 1578216891, a Type 2 (organization) record in the CMS NPPES registry.

Providers at this address

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Donald Wallens Psychiatry Physician · Los Angeles, CA NPI 1952401762 Donald E Wallens MD A Medical Corp Specialist · Los Angeles, CA NPI 1982916037 Joanna Gillis Clinical Social Worker · Los Angeles, CA NPI 1942755517 Joanna L Gillis Clinical Social Worker · Los Angeles, CA NPI 1437717451

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-02-15.