Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Cortney Del Duffy, PH.D.

Clinical Psychologist in Duluth, MN · enumerated 2018 · practices at Rooted Psychology.

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

National Provider Identifier

1740763085

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Registry record

Entity type Individual (Type 1)

Name Dr. Cortney Del Duffy

Credential PH.D.

Sex Female

Practice address 306 W Superior St Ste 405, Duluth, MN, 55802

Phone (218) 203-9335

Enumeration date Sep 12, 2018

Last updated in NPPES Jul 15, 2021

Taxonomy & licenses

103TC1900X Counseling Psychologist Behavioral Health & Social Service Providers · License LP6283 (MN) Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License LP6283 (MN) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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 1740763085 active?

Yes, as of the latest NPPES snapshot, NPI 1740763085 is active (record last updated 2021-07-15).

How do I verify Cortney Duffy's NPI record?

Cross-check NPI 1740763085 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Rooted Psychology Mental Health Clinic/Center (Including Community Mental Health Center) · Duluth, MN NPI 1386408193

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-15.