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

Mary Darby, RN

Psychiatric/Mental Health Registered Nurse in Lexington, MA · enumerated 2023.

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

National Provider Identifier

1417659913

Verified

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Registry record

Entity type Individual (Type 1)

Name Mary Darby

Credential RN

Sex Female

Practice address Lexington, MA, 02421

Phone (781) 861-0890

Enumeration date Mar 20, 2023

Last updated in NPPES Mar 20, 2023

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

Taxonomy & licenses

163WP0808X Psychiatric/Mental Health Registered Nurse Nursing Service Providers · License RN2326271 (MA) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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

Is NPI 1417659913 active?

Yes, as of the latest NPPES snapshot, NPI 1417659913 is active (record last updated 2023-03-20).

How do I verify Mary Darby's NPI record?

Cross-check NPI 1417659913 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-20.