Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Matthew Charles Phelps, LMSW

Social Worker in Baltimore, MD · enumerated 2021.

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

National Provider Identifier

1255929865

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Registry record

Entity type Individual (Type 1)

Name Matthew Charles Phelps

Credential LMSW

Sex Male

Practice address 200 E North Ave Rm 211, Baltimore, MD, 21202

Phone (443) 984-2000

Enumeration date Jan 8, 2021

Last updated in NPPES Oct 2, 2023

Taxonomy & licenses

1041S0200X School Social Worker Behavioral Health & Social Service Providers · License 24850 (MD) Secondary

104100000X Social Worker Behavioral Health & Social Service Providers · License 24850 (MD) Primary

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

Is NPI 1255929865 active?

Yes, as of the latest NPPES snapshot, NPI 1255929865 is active (record last updated 2023-10-02).

How do I verify Matthew Phelps's NPI record?

Cross-check NPI 1255929865 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-02.