Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Martha Lois Greist-Joel, R.N.

Occupational Health Registered Nurse in Livermore, CA · enumerated 2013.

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

National Provider Identifier

1336589720

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Registry record

Entity type Individual (Type 1)

Name Ms. Martha Lois Greist-Joel

Credential R.N.

Sex Female

Practice address 7000 East Ave, Livermore, CA, 94550

Phone (925) 422-2475

Enumeration date Jun 28, 2013

Last updated in NPPES Jun 28, 2013

Taxonomy & licenses

163WX0106X Occupational Health Registered Nurse Nursing Service Providers · License 270031 (CA) Primary

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

The National Provider Identifier (NPI) for Martha Greist-Joel is 1336589720, a Type 1 (individual) record in the CMS NPPES registry.

Where does Martha Greist-Joel 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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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-06-28.