Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cassandra Hartwig, NP

Nurse Practitioner in Waterloo, WI · enumerated 2017.

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

National Provider Identifier

1215476163

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Registry record

Entity type Individual (Type 1)

Name Cassandra Hartwig

Credential NP

Sex Female

Practice address 537 Mckay Way, Waterloo, WI, 53594

Phone (608) 206-4364

Enumeration date Feb 13, 2017

Last updated in NPPES Jun 23, 2023

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 7517 (WI) 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

Is NPI 1215476163 active?

Yes, as of the latest NPPES snapshot, NPI 1215476163 is active (record last updated 2023-06-23).

How do I verify Cassandra Hartwig's NPI record?

Cross-check NPI 1215476163 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-06-23.