Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Andrew Tietjen, FNP

Nurse Practitioner in Boise, ID · enumerated 2025.

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

National Provider Identifier

1427859164

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Registry record

Entity type Individual (Type 1)

Name Andrew Tietjen

Credential FNP

Sex Male

Practice address 6051 W Emerald St, Boise, ID, 83704

Phone (208) 302-5150

Fax (208) 302-5155

Enumeration date Mar 20, 2025

Last updated in NPPES May 23, 2025

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 5871656 (ID) Primary

FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP 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 Andrew Tietjen?

Andrew Tietjen is registered in NPPES with the primary taxonomy of Nurse Practitioner. 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.

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Shane Mccauley Occupational Medicine Physician · Boise, ID NPI 1083603229 Arthur Jones Family Medicine Physician · Boise, ID NPI 1063402097 Alex Casebolt Physician Assistant · Boise, ID NPI 1346283363 Kenneth Gramyk Emergency Medicine Physician · Boise, ID NPI 1598778136 Mark Nassir Occupational Medicine Physician · Boise, ID NPI 1649377169 Heather Hammerstedt Emergency Medicine Physician · Boise, ID NPI 1275621104 Amy Aldrich Emergency Medicine Physician · Boise, ID NPI 1285840298 Elizabeth Davis Emergency Medicine Physician · Boise, ID NPI 1801074232

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-05-23.