Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Black-Williams, NP

Women's Health Nurse Practitioner in Montclair, CA · enumerated 2006.

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

National Provider Identifier

1114013026

Verified

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Registry record

Entity type Individual (Type 1)

Name Mary Black-Williams

Credential NP

Sex Female

Practice address 5050 San Bernardino St, Montclair, CA, 91763

Phone (909) 626-2463

Fax (909) 624-6297

Enumeration date Oct 5, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

363LW0102X Women's Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 231324 (CA) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP credential

Other identifiers

Identifier	Type	State	Issuer
RN2313240	Other	CA	MEDI-CAL

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 specialty is Mary Black-Williams?

Mary Black-Williams is registered in NPPES with the primary taxonomy of Women's Health Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.