Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karen Marie Sadler, ARNP

Nurse Practitioner in Waterloo, IA · enumerated 2020.

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

National Provider Identifier

1891396529

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Registry record

Entity type Individual (Type 1)

Name Karen Marie Sadler

Credential ARNP

Sex Female

Practice address 2515 Cyclone Dr Ste B, Waterloo, IA, 50701

Phone (319) 888-8044

Enumeration date Nov 9, 2020

Last updated in NPPES Feb 7, 2022

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License A161407 (IA) 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

Is NPI 1891396529 active?

Yes, as of the latest NPPES snapshot, NPI 1891396529 is active (record last updated 2022-02-07).

How do I verify Karen Sadler's NPI record?

Cross-check NPI 1891396529 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-02-07.