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

Alexis Joan Ollendorf

Behavior Analyst in Islip, NY · enumerated 2013.

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

National Provider Identifier

1588904916

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Registry record

Entity type Individual (Type 1)

Name Alexis Joan Ollendorf

Sex Female

Practice address Islip, NY, 11751

Phone (631) 559-3770

Enumeration date Feb 21, 2013

Last updated in NPPES Aug 30, 2019

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

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 638308121 (NY) Secondary

103K00000X Behavior Analyst Behavioral Health & Social Service Providers 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

How do I verify Alexis Ollendorf's NPI record?

Cross-check NPI 1588904916 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1588904916 active?

Yes — as of the latest NPPES snapshot, NPI 1588904916 is active (record last updated 2019-08-30).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-08-30.