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

Margaret M Demayo, LCSW

Clinical Social Worker in Winchester, VA · enumerated 2006.

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

National Provider Identifier

1821101510

Verified

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Registry record

Entity type Individual (Type 1)

Name Margaret M Demayo

Credential LCSW

Sex Female

Practice address Winchester, VA, 22602

Phone (540) 533-0956

Enumeration date Aug 16, 2006

Last updated in NPPES Jun 21, 2011

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 0904005983 (VA) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

Other identifiers

Identifier	Type	State	Issuer
178790	Other	VA	ANTHEM
010155754	Medicaid	VA	-

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 is the NPI number for Margaret Demayo?

The National Provider Identifier (NPI) for Margaret Demayo is 1821101510, a Type 1 (individual) record in the CMS NPPES registry.

Where does Margaret Demayo practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-06-21.