Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Joseph Field DDS Inc.

Dental Clinic/Center in Los Altos, CA · enumerated 2026 · authorized official Casey Castle, Director of Payor Contracting.

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

National Provider Identifier

1598693251

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Joseph Field DDS Inc.

Practice address 99 3rd St, Los Altos, CA, 94022

Phone (650) 948-5524

Enumeration date May 12, 2026

Last updated in NPPES May 12, 2026

Taxonomy & classification

261QD0000X Dental Clinic/Center Ambulatory Health Care Facilities Primary

Authorized official

Name Casey Castle

Title Director of Payor Contracting

Phone (912) 732-1504

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2026-05-12. Verify at npiregistry.cms.hhs.gov.

Where is Joseph Field DDS Inc. located?

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

Providers at this address

Browse all →

Joseph Field General Practice Dentistry · Los Altos, CA NPI 1023307055 John Mcfarlane General Practice Dentistry · Los Altos, CA NPI 1285986810 Karl Supal General Practice Dentistry · Los Altos, CA NPI 1275188930

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-12.