Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Patti Caroline Mcwilliams, MFT RN CNS

Adult Psychiatric/Mental Health Clinical Nurse Specialist in San Francisco, CA · enumerated 2007.

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

National Provider Identifier

1639395015

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Ms. Patti Caroline Mcwilliams

Credential MFT RN CNS

Sex Female

Practice address 4112 24th Street, San Francisco, CA, 94114

Phone (415) 282-6228

Enumeration date Apr 17, 2007

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License MR00002647 (CA) Secondary

364SP0809X Adult Psychiatric/Mental Health Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers · License L140019 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
P028	Other	CA	BOARD OF REG NURSING

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 Patti Mcwilliams practice?

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

What is the NPI number for Patti Mcwilliams?

The National Provider Identifier (NPI) for Patti Mcwilliams is 1639395015, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.