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

Mrs. Susan Lacey Williams, RN, LICSW

Psychologist in Greenfield, MA · enumerated 2006.

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

National Provider Identifier

1992741953

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mrs. Susan Lacey Williams

Credential RN, LICSW

Sex Female

Practice address Greenfield, MA, 01301

Phone (413) 774-5012

Fax (413) 339-0148

Enumeration date Jun 20, 2006

Last updated in NPPES Oct 19, 2009

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

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License LICSW1023496 (MA) Primary

163W00000X Registered Nurse Nursing Service Providers · License 144039 (MA) Secondary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN credential

Other identifiers

Identifier	Type	State	Issuer
P08203	Other	MA	BCBS MA
32153	Other	MA	BMC HEALTHNET

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

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.

What specialty is Susan Williams?

Susan Williams is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-10-19.