Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

WILLIAM A MOUSSER
NPI 1699686600
Counselor - Addiction (Substance Use Disorder) in Waianae, HI

Q: What is William Mousser's NPI number?

The NPI number for William Mousser is 1699686600. It was assigned to this individual provider in the NPPES registry on September 16, 2026.

Q: What is William Mousser's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

Q: When was this NPI record last updated?

The NPPES record for William Mousser was last updated on September 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since September 16, 2026

84-578 MANUKU STREET, WAIANAE, HI 96792(808) 306-9842 Get Directions Write a Review

NPPES record added: September 16, 2026. Verified against the NPPES registry weekly; last sync: September 20, 2026.

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About William A Mousser NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM A MOUSSER (NPI 1699686600) is an individual addiction (substance use disorder) provider in Waianae, Hawaii, licensed in Hawaii (832-97) and active in the NPI registry since September 2026.

NPPES Registry Identity

NPI1699686600

Entity TypeIndividualMale

Primary Taxonomy101YA0400X

Provider Legal NameWILLIAM A MOUSSER

Location Address84-578 MANUKU STREETWaianae, HI 96792

Mailing AddressPo Box 458Waianae, HI 96792-0458 · (808) 306-9842

Phone(808) 306-9842

Sole ProprietorYes

Enumeration DateSeptember 16, 2026

NPPES CertifiedSeptember 16, 2026

✔ NPI 1699686600 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Addiction (Substance Use Disorder)Behavioral Health & Social Service Providers

Taxonomy Code101YA0400X

License✔ Licensed in HI · 832-97

84-578 MANUKU STREET, Waianae, HI 96792

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Mousser's NPI number?

The NPI number for William Mousser is 1699686600. It was assigned to this individual provider in the NPPES registry on September 16, 2026.

Where is William Mousser located?

William Mousser practices at 84-578 Manuku Street, Waianae, HI 96792. The listed phone number is (808) 306-9842.

What is William Mousser's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

When was this NPI record last updated?

The NPPES record for William Mousser was last updated on September 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.