Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Diane Trkulja-Castro, NURSE PRACTITIONER

Primary Care Nurse Practitioner in Chesterton, IN · enumerated 2017.

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

National Provider Identifier

1689109084

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Registry record

Entity type Individual (Type 1)

Name Diane Trkulja-Castro

Credential NURSE PRACTITIONER

Sex Female

Practice address 3100 Village Pt Ste 250, Chesterton, IN, 46304

Phone (219) 440-4835

Fax (855) 238-6150

Enumeration date Apr 24, 2017

Last updated in NPPES Jan 7, 2025

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 28187141A (IN) Secondary

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 71007089A (IN) Secondary

363LP2300X Primary Care Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 71007089A (IN) Primary

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 Diane Trkulja-Castro?

The National Provider Identifier (NPI) for Diane Trkulja-Castro is 1689109084, a Type 1 (individual) record in the CMS NPPES registry.

Where does Diane Trkulja-Castro practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-01-07.