Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Lawrence James Williamson, M.D.

Family Medicine Physician in Windsor, CA · enumerated 2006.

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

National Provider Identifier

1508821273

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Registry record

Entity type Individual (Type 1)

Name Dr. Lawrence James Williamson

Credential M.D.

Sex Male

Practice address 911 Medical Center Plaza, Suite 23, Windsor, CA, 95492

Phone (707) 837-0170

Fax (707) 837-0177

Enumeration date Apr 18, 2006

Last updated in NPPES May 4, 2010

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License A73495 (CA) 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

Where does Lawrence Williamson practice?

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

What is the NPI number for Lawrence Williamson?

The National Provider Identifier (NPI) for Lawrence Williamson is 1508821273, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-05-04.