Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Susan J Iffrig, N.P.

Q: What is the NPI number for Susan Iffrig?

The National Provider Identifier (NPI) for Susan Iffrig is 1588663405, a Type 1 (individual) record in the CMS NPPES registry.

Family Nurse Practitioner in Saint Peters, MO · enumerated 2005.

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

National Provider Identifier

1588663405

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Registry record

Entity type Individual (Type 1)

Name Mrs. Susan J Iffrig

Credential N.P.

Sex Female

Practice address 1901 Trade Center Dr, Saint Peters, MO, 63376

Phone (636) 978-1610

Fax (636) 978-1926

Enumeration date Jul 21, 2005

Last updated in NPPES Jan 28, 2021

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 102332 (MO) 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

Where does Susan Iffrig practice?

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

What is the NPI number for Susan Iffrig?

The National Provider Identifier (NPI) for Susan Iffrig is 1588663405, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-01-28.