Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William Howard Ollendike, LPC-S

School Counselor in Madisonville, LA · enumerated 2015.

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

National Provider Identifier

1538554639

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mr. William Howard Ollendike

Credential LPC-S

Sex Male

Practice address 209 Highway 22 Suite G, Madisonville, LA, 70447

Phone (985) 778-6433

Enumeration date Apr 6, 2015

Last updated in NPPES Apr 6, 2015

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

101YS0200X School Counselor Behavioral Health & Social Service Providers · License 4386 (LA) 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

Where does William Ollendike practice?

The practice location on file with NPPES is in Madisonville, LA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Ollendike?

The National Provider Identifier (NPI) for William Ollendike is 1538554639, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-04-06.