Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Ms. Katherine Rae Mayer, OTR/L

Pediatric Occupational Therapist in Olympia, WA · enumerated 2018.

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

National Provider Identifier

1821589961

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Registry record

Entity type Individual (Type 1)

Name Ms. Katherine Rae Mayer

Credential OTR/L

Sex Female

Practice address Olympia, WA, 98502

Phone (360) 463-8488

Enumeration date May 24, 2018

Last updated in NPPES Jul 21, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

225X00000X Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License OT00000649 (WA) Secondary

225XP0200X Pediatric Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License OT00000649 (WA) Primary

Other identifiers

Identifier	Type	State	Issuer
OT00000649	Other	WA	LICENSE

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 1821589961 active?

Yes, as of the latest NPPES snapshot, NPI 1821589961 is active (record last updated 2022-07-21).

How do I verify Katherine Mayer's NPI record?

Cross-check NPI 1821589961 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 2022-07-21.