NPI Portal NPI Lookup & Verification

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

Dr. Marissa Mendrygal Williams, AU.D.

Audiologist in Houston, TX · enumerated 2008.

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

National Provider Identifier

1932364981

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Marissa Mendrygal Williams
Credential AU.D.
Sex Female
Practice address Houston, TX, 77079
Phone (281) 741-7295
Enumeration date Jul 18, 2008
Last updated in NPPES Oct 2, 2023

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

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License AU 2615 (CA) Secondary
231H00000X Audiologist Speech, Language and Hearing Service Providers · License 80215 (TX) Primary
AUD · Doctor of Audiology: A licensed audiologist diagnosing and treating hearing and balance disorders. About the AUD 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

Where does Marissa Williams practice?
The practice location on file with NPPES is in Houston, TX. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Marissa Williams?
The National Provider Identifier (NPI) for Marissa Williams is 1932364981, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-02.