Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Rebecca Lynne Macisaac, NURSE PRACTITIONER

Nurse Practitioner in Livermore, CA · enumerated 2007.

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

National Provider Identifier

1205018744

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Registry record

Entity type Individual (Type 1)

Name Mrs. Rebecca Lynne Macisaac

Credential NURSE PRACTITIONER

Sex Female

Practice address 7000 East Ave, Livermore, CA, 94550

Phone (925) 422-8920

Enumeration date Nov 27, 2007

Last updated in NPPES Nov 30, 2021

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 95004504 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Rebecca Macisaac?

The National Provider Identifier (NPI) for Rebecca Macisaac is 1205018744, a Type 1 (individual) record in the CMS NPPES registry.

Where does Rebecca Macisaac practice?

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

Other providers at this practice address

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Patrick Keller Occupational Medicine Physician · Livermore, CA NPI 1013972520 Jody Tomic Medical Physician Assistant · Livermore, CA NPI 1952510240 Pedro Estacio Specialist · Livermore, CA NPI 1710256250 Elizabeth Yu Hand Physical Therapist · Livermore, CA NPI 1659630853 Martha Greist-Joel Occupational Health Registered Nurse · Livermore, CA NPI 1336589720 Trymica Provost Registered Nurse · Livermore, CA NPI 1093318156 Kelsey Becerra Occupational Health Registered Nurse · Livermore, CA NPI 1427651629 Alexus Henderson Registered Nurse · Livermore, CA NPI 1801487624

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-11-30.