Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Sidney Blackmore, D.M.D.

Oral and Maxillofacial Surgery (Dentist) in Alpine, CA · enumerated 2013.

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

National Provider Identifier

1427480151

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Registry record

Entity type Individual (Type 1)

Name Dr. William Sidney Blackmore

Credential D.M.D.

Sex Male

Practice address 23377 Illahee Dr, Alpine, CA, 91901

Phone (208) 251-3382

Enumeration date Aug 5, 2013

Last updated in NPPES Apr 21, 2025

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License D-4516 (ID) Secondary

1223S0112X Oral and Maxillofacial Surgery (Dentist) Dental Providers · License D-4516 (ID) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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

Is NPI 1427480151 active?

Yes, as of the latest NPPES snapshot, NPI 1427480151 is active (record last updated 2025-04-21).

How do I verify William Blackmore's NPI record?

Cross-check NPI 1427480151 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-21.