Dr. William Williams MD
About this NPIWhat this record shows.
NPI 1407034473 is registered to Dr. William Williams MD, a Adult Medicine Physician practising at 1 Main St in San Quentin, California. Adult Medicine Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy. Dr. William Williams MD has been enumerated in the National Provider Identifier (NPI) registry since 2008.
Your brand here.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Dr. William Williams MD accepts. To confirm in-network status with your specific health plan, contact Dr. William Williams MD directly at (415) 454-1460.
Frequently asked
Yes. NPI 1407034473 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Adult Medicine Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (415) 454-1460.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Dr. William Williams MD is a Type-1 individual NPI.