Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Theresa Marie Johnston, NP

Family Nurse Practitioner in Newark, DE · enumerated 2005.

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

National Provider Identifier

1235124306

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Registry record

Entity type Individual (Type 1)

Name Theresa Marie Johnston

Credential NP

Sex Female

Practice address 4745 Ogletown Stanton Rd, Medical Arts Pavillion 1 Suite 136, Newark, DE, 19713

Phone (302) 733-2387

Enumeration date Sep 15, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License LG-0000161 (DE) 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 is the NPI number for Theresa Johnston?

The National Provider Identifier (NPI) for Theresa Johnston is 1235124306, a Type 1 (individual) record in the CMS NPPES registry.

Where does Theresa Johnston practice?

The practice location on file with NPPES is in Newark, DE. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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