Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MASTERY COUNSELING AND CONSULTING LLC
NPI 1346819745
Social Worker - Clinical in Webster Groves, MO

Q: What is Mastery Counseling And Consulting LLC's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Active since June 21, 2021

357 MARSHALL AVE STE 2, WEBSTER GROVES, MO 63119(314) 254-3378 Get Directions Write a Review

NPPES record last updated: September 9, 2026. Verified against the NPPES registry weekly; last sync: September 20, 2026.

Record update history: Sep 9, 2026, Jan 14, 2022, Jun 21, 2021 (3 updates tracked since 2021).

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About Mastery Counseling And Consulting Llc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MASTERY COUNSELING AND CONSULTING LLC (NPI 1346819745) is a healthcare organization registered as a clinical in Webster Groves, Missouri and active in the NPI registry since June 2021. The organization lists Brianne Serdar, Owner, as its authorized official.

NPPES Registry Identity

NPI1346819745

Entity TypeOrganization

Primary Taxonomy1041C0700X

Legal Business NameMASTERY COUNSELING AND CONSULTING LLC

Location Address357 MARSHALL AVE STE 2Webster Groves, MO 63119-1827

Mailing Address357 Marshall Ave Ste 2Webster Groves, MO 63119-1827 · (314) 254-3378

Phone(314) 254-3378

Organization SubpartNo

Authorized OfficialBrianne SerdarOwner · (314) 254-4375

Enumeration DateJune 21, 2021

Last NPPES UpdateSeptember 9, 20263 updates tracked since enumeration

NPPES CertifiedSeptember 9, 2026

✔ NPI 1346819745 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code1041C0700X

Definition

A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.

357 MARSHALL AVE STE 2, Webster Groves, MO 63119

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. KAREN ANDRE LOAIZA PH.D.

Psychologist (Clinical)

357 MARSHALL AVE STE 2
WEBSTER GROVES, MO 63119

St. Louis County (314) 337-4220

PERSPECTIVES PSYCHOTHERAPY LLC

Psychologist (Clinical)

357 MARSHALL AVE STE 2
WEBSTER GROVES, MO 63119

St. Louis County (314) 337-4220

MRS. BRIANNE ELIZABETH SERDAR MSW, LCSW

Social Worker (Clinical)

357 MARSHALL AVE STE 2
WEBSTER GROVES, MO 63119

St. Louis County (314) 254-3378

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mastery Counseling And Consulting LLC's NPI number?

The NPI number for Mastery Counseling And Consulting LLC is 1346819745. It was assigned to this organization in the NPPES registry on June 21, 2021.

Where is Mastery Counseling And Consulting LLC located?

Mastery Counseling And Consulting LLC is located at 357 Marshall Ave Ste 2, Webster Groves, MO 63119. The listed phone number is (314) 254-3378.

What is Mastery Counseling And Consulting LLC's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

When was this NPI record last updated?

The NPPES record for Mastery Counseling And Consulting LLC was last updated on September 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.