Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Wendy Day

Primary Care Nurse Practitioner in Mercersburg, PA · enumerated 2019 · practices at Wellspan Medical Group.

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

National Provider Identifier

1255897245

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Registry record

Entity type Individual (Type 1)

Name Wendy Day

Sex Female

Practice address 2 Keefer Dr, Mercersburg, PA, 17236

Phone (717) 328-2119

Fax (717) 328-0071

Enumeration date Feb 14, 2019

Last updated in NPPES May 29, 2025

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License RN500391L (PA) Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License R189100 (MD) Secondary

363LP2300X Primary Care Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License SP020337 (PA) Primary

Other identifiers

Identifier	Type	State	Issuer
14408608	Other	-	CAQH
103643464	Medicaid	PA	-

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 Wendy Day?

Wendy Day is registered in NPPES with the primary taxonomy of Primary Care Nurse Practitioner. 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 2026-07-13. Provider record last updated 2025-05-29.