Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Margaret Linda Difelice, PA C

Medical Physician Assistant in Fairfield, CA · enumerated 2007.

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

National Provider Identifier

1356489678

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Registry record

Entity type Individual (Type 1)

Name Ms. Margaret Linda Difelice

Credential PA C

Sex Female

Practice address 1525 Webster St Ste A, Fairfield, CA, 94533

Phone (707) 423-2506

Fax (707) 429-1158

Enumeration date Feb 1, 2007

Last updated in NPPES Sep 24, 2014

Taxonomy & licenses

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA11565 (CA) Primary

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.

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Frequently asked questions

What is the NPI number for Margaret Difelice?

The National Provider Identifier (NPI) for Margaret Difelice is 1356489678, a Type 1 (individual) record in the CMS NPPES registry.

Where does Margaret Difelice practice?

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

Other providers at this practice address

Browse all →

Steven Tolkan Nephrology Physician · Fairfield, CA NPI 1871554766 Jayesh J. Patel M.D. Inc Primary Care Clinic/Center · Fairfield, CA NPI 1326236753 Gurinder S. Dhillon M D Professional Corporation Specialist · Fairfield, CA NPI 1477732899

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-09-24.