Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Marissa Ann Ritzenthaler, RN

Registered Nurse in Klamath Falls, OR · enumerated 2024.

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

National Provider Identifier

1023864022

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Registry record

Entity type Individual (Type 1)

Name Mrs. Marissa Ann Ritzenthaler

Credential RN

Sex Female

Practice address 1336 Avalon St, Klamath Falls, OR, 97603

Phone (541) 591-3409

Enumeration date Apr 29, 2024

Last updated in NPPES May 1, 2024

Taxonomy & licenses

163WS0200X School Registered Nurse Nursing Service Providers · License 202209976RN (OR) Secondary

163W00000X Registered Nurse Nursing Service Providers · License 202209976RN (OR) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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

How do I verify Marissa Ritzenthaler's NPI record?

Cross-check NPI 1023864022 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1023864022 active?

Yes, as of the latest NPPES snapshot, NPI 1023864022 is active (record last updated 2024-05-01).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-01.