Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Rives C. Chalmers, M.D. A Prof Corp

Orthopaedic Surgery Physician in Los Gatos, CA · enumerated 2009 · authorized official Rives Chalmers, President.

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

National Provider Identifier

1689806812

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Registry record

Entity type Organization (Type 2)

Legal business name Rives C. Chalmers, M.D. A Prof Corp

Practice address 800 Pollard Rd Ste A3, Los Gatos, CA, 95032

Phone (408) 379-3490

Fax (408) 374-4738

Enumeration date Aug 21, 2009

Last updated in NPPES Aug 21, 2009

Taxonomy & classification

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License C36471 (CA) Primary

Authorized official

Name Rives Chalmers

Title President

Phone (408) 379-3490

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 is Rives C. Chalmers, M.D. A Prof Corp located?

The practice location on file with NPPES is in Los Gatos, CA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2009-08-21. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-08-21.