Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Maria Powell Dierdorf, LPC, LSATP

Professional Counselor in Henrico, VA · enumerated 2014.

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

National Provider Identifier

1629477146

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Registry record

Entity type Individual (Type 1)

Name Mrs. Maria Powell Dierdorf

Credential LPC, LSATP

Sex Female

Practice address 2807 N Parham Rd Ste 320, Henrico, VA, 23294

Phone (804) 929-1354

Enumeration date Aug 20, 2014

Last updated in NPPES Jan 18, 2026

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 0718000424 (VA) Secondary

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 0701008644 (VA) Primary

LPC · Licensed Professional Counselor: A licensed mental-health counselor providing psychotherapy. About the LPC 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

What specialty is Maria Dierdorf?

Maria Dierdorf is registered in NPPES with the primary taxonomy of Professional Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-18.