Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Constance L Williams, M.D.

Internal Medicine Physician in Andover, MA · enumerated 2006.

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

National Provider Identifier

1326155912

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Registry record

Entity type Individual (Type 1)

Name Constance L Williams

Credential M.D.

Sex Female

Practice address Unicare- 200 Brickstone Square, Suite #101, Andover, MA, 01810

Phone (978) 474-6816

Enumeration date Aug 23, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 71078 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

What is the NPI number for Constance Williams?

The National Provider Identifier (NPI) for Constance Williams is 1326155912, a Type 1 (individual) record in the CMS NPPES registry.

Where does Constance Williams practice?

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

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