Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Sandra Barnes Castle, M.ED.

Audiologist in Frederick, MD · enumerated 2007.

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

National Provider Identifier

1891849717

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Registry record

Entity type Individual (Type 1)

Name Ms. Sandra Barnes Castle

Credential M.ED.

Sex Female

Practice address 801 Toll House Ave, Unit D3, Frederick, MD, 21701

Phone (301) 846-0222

Fax (301) 846-7707

Enumeration date Jan 22, 2007

Last updated in NPPES Feb 18, 2008

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License 123 (MD) Primary

Other identifiers

Identifier	Type	State	Issuer
47321	Other	MD	ALLIANCE
210B	Other	DC	CAREFIRST
47321	Other	MD	UNITED
J981	Other	MD	CAREFIRST
4264065	Other	MD	CIGNA
3654700	Other	MD	AETNA
47321	Other	MD	MAMSI
47321	Other	MD	OPTIMUM CHOICE

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 Sandra Castle practice?

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

What is the NPI number for Sandra Castle?

The National Provider Identifier (NPI) for Sandra Castle is 1891849717, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-18.