Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. David Walenczyk, LMFT

Mental Health Counselor in Norwalk, CT · enumerated 2012.

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

National Provider Identifier

1588935357

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Registry record

Entity type Individual (Type 1)

Name Mr. David Walenczyk

Credential LMFT

Sex Male

Practice address 20 N Main St, 3rd Floor, Norwalk, CT, 06854

Phone (203) 838-6508

Fax (203) 852-7021

Enumeration date Jan 25, 2012

Last updated in NPPES Dec 22, 2014

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 000620 (CT) Secondary

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 000620 (CT) 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 David Walenczyk practice?

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

What is the NPI number for David Walenczyk?

The National Provider Identifier (NPI) for David Walenczyk is 1588935357, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-12-22.