NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Charles L. Mason

Pharmacist in Largo, MD · enumerated 2020 · practices at Giant of Maryland LLC.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1437752797

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Registry record

Entity type Individual (Type 1)
Name Charles L. Mason
Sex Male
Practice address Largo, MD, 20774
Phone (301) 336-9428
Enumeration date Nov 19, 2020
Last updated in NPPES Nov 19, 2020

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License 17601 (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.

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Frequently asked questions

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.
What specialty is Charles Mason?
Charles Mason is registered in NPPES with the primary taxonomy of Pharmacist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2020-11-19.