Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Karen L Nay, NP

Gerontology Nurse Practitioner in Waltham, MA · enumerated 2007.

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

National Provider Identifier

1295887230

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Registry record

Entity type Individual (Type 1)

Name Mrs. Karen L Nay

Credential NP

Sex Female

Practice address Evercare 950 Winter St, Suite 3800, Waltham, MA, 02451

Phone (781) 472-6441

Enumeration date Jan 18, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

363LG0600X Gerontology Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 124247 (MA) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Karen Nay?

Karen Nay is registered in NPPES with the primary taxonomy of Gerontology 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.