Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Toni Marie Lasiewicki, MFTI

Marriage & Family Therapist in San Diego, CA · enumerated 2008 · practices at Community Research Foundation Inc.

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

National Provider Identifier

1821247966

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Registry record

Entity type Individual (Type 1)

Name Toni Marie Lasiewicki

Credential MFTI

Sex Female

Practice address 1465 30th St, San Diego, CA, 92154

Phone (619) 428-1000

Fax (619) 428-1091

Enumeration date Sep 13, 2008

Last updated in NPPES Sep 26, 2016

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 61560 (CA) Secondary

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License IMF87209 (CA) Secondary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License IMF87209 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
8544	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 Toni Lasiewicki?

The National Provider Identifier (NPI) for Toni Lasiewicki is 1821247966, a Type 1 (individual) record in the CMS NPPES registry.

Where does Toni Lasiewicki practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-09-26.