Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mary Keith Castle, FNP
Nurse Practitioner in Oxford, MS · enumerated 2025.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1932996758
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Registry record
Entity type Individual (Type 1)
Name Mary Keith Castle
Credential FNP
Sex Female
Practice address 2908 S Lamar Blvd, Oxford, MS, 38655
Phone (662) 281-0112
Fax (662) 281-0943
Enumeration date Apr 23, 2025
Last updated in NPPES May 21, 2025
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 907324 (MS) Primary
FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan.
About the FNP credential
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 Mary Castle?
Mary Castle is registered in NPPES with the primary taxonomy of Nurse Practitioner. 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 2025-05-21.