Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Derek A Weiss, FNP-C

Q: What is the NPI number for Derek Weiss?

The National Provider Identifier (NPI) for Derek Weiss is 1356917561, a Type 1 (individual) record in the CMS NPPES registry.

Family Nurse Practitioner in Townsend, MT · enumerated 2021.

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

National Provider Identifier

1356917561

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Registry record

Entity type Individual (Type 1)

Name Derek A Weiss

Credential FNP-C

Sex Male

Practice address 110 N Oak St, Townsend, MT, 59644

Phone (406) 266-3186

Enumeration date May 28, 2021

Last updated in NPPES Jul 16, 2024

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 175753 (MT) 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

Where does Derek Weiss practice?

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

What is the NPI number for Derek Weiss?

The National Provider Identifier (NPI) for Derek Weiss is 1356917561, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-07-16.