Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Beth Clark

Q: What is the NPI number for Mary Clark?

The National Provider Identifier (NPI) for Mary Clark is 1255958252, a Type 1 (individual) record in the CMS NPPES registry.

Speech-Language Pathologist in Sioux City, IA · enumerated 2020.

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

National Provider Identifier

1255958252

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Registry record

Entity type Individual (Type 1)

Name Mary Beth Clark

Sex Female

Practice address 18 La Salle Ave, Sioux City, IA, 51104

Phone (712) 574-2220

Enumeration date Jun 25, 2020

Last updated in NPPES Jun 25, 2020

Taxonomy & licenses

235Z00000X Speech-Language Pathologist Speech, Language and Hearing 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

What is the NPI number for Mary Clark?

The National Provider Identifier (NPI) for Mary Clark is 1255958252, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mary Clark practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-06-25.