Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David Tierney, PHD

Psychologist in Johnson City, TN · enumerated 2021.

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

National Provider Identifier

1962073338

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Registry record

Entity type Individual (Type 1)

Name David Tierney

Credential PHD

Sex Male

Practice address 615 N State of Franklin Rd, Johnson City, TN, 37604

Phone (423) 930-8337

Enumeration date Jul 7, 2021

Last updated in NPPES Sep 17, 2025

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 0810008866 (VA) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 4155 (TN) 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

What specialty is David Tierney?

David Tierney is registered in NPPES with the primary taxonomy of Psychologist. 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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Jonathan Moorman Infectious Disease Physician · Johnson City, TN NPI 1023003936 Wael Shams Infectious Disease Physician · Johnson City, TN NPI 1265420046 Parasbhai Patel Infectious Disease Physician · Johnson City, TN NPI 1245217504 Christine Rigsby Nurse Practitioner · Johnson City, TN NPI 1710012125 Lamis Ibrahim Infectious Disease Physician · Johnson City, TN NPI 1780872358 Dima Youssef Infectious Disease Physician · Johnson City, TN NPI 1245411255 Julie Hunt Family Nurse Practitioner · Johnson City, TN NPI 1083852156 Roxanne Underwood Family Nurse Practitioner · Johnson City, TN NPI 1982033163

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-17.