Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mrs. Elizabeth Guy Walker, LMSW
Social Worker in Lexington Park, MD · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1720698434
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Registry record
Entity type Individual (Type 1)
Name Mrs. Elizabeth Guy Walker
Credential LMSW
Sex Female
Practice address 22776 Three Notch Rd, Lexington Park, MD, 20653
Phone (301) 862-9600
Fax (301) 863-9606
Enumeration date Aug 6, 2020
Last updated in NPPES Aug 6, 2020
Taxonomy & licenses
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.
Frequently asked questions
What specialty is Elizabeth Walker?
Elizabeth Walker is registered in NPPES with the primary taxonomy of Social Worker. 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.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-06.