Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Catherine Anne Grellet, M.D.

Internal Medicine Physician in Los Gatos, CA · enumerated 2006.

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

National Provider Identifier

1053418939

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Registry record

Entity type Individual (Type 1)

Name Dr. Catherine Anne Grellet

Credential M.D.

Sex Female

Practice address 15251 National Ave, Suite 104, Los Gatos, CA, 95032

Phone (408) 358-7360

Fax (408) 358-7357

Enumeration date Sep 20, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License G55508 (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 Catherine Grellet practice?

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

What is the NPI number for Catherine Grellet?

The National Provider Identifier (NPI) for Catherine Grellet is 1053418939, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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