Dr. Fred Arthur Diercks, DDS

Dr. Fred Arthur Diercks is a Dentist provider (Dentist) practicing in San Mateo, CA, registered in the NPPES registry with NPI 1215943071 since 2006. The credential DDS stands for Doctor of Dental Surgery.

✓ Active NPI ✓ Valid NPI checksum

NPI	1215943071
Entity type	Individual (Type 1)
Name	Dr. Fred Arthur Diercks
Credential	DDS
Sex	Male
Practice address	320 N SAN MATEO DR, San Mateo, CA, 94401
Phone	6503427401
Fax	6503426003
Enumeration date	2006-08-01
Last updated in NPPES	2007-07-08

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
122300000X	Dentist	Primary	18461	CA

DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Copy-ready billing details

Provider: Fred Diercks, DDS
NPI: 1215943071
Taxonomy: 122300000X (Dentist)
Address: 320 N SAN MATEO DR, San Mateo, CA, 94401

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1326055005	Paul Diercks	Individual	Dentist	San Mateo, CA
1982790861	Li-Chu Chen	Individual	General Practice Dentistry	San Mateo, CA
1780801886	Tze-Foun Tsiang	Individual	General Practice Dentistry	San Mateo, CA

Verify this record

Cross-check NPI 1215943071 against the authoritative CMS record: view Dr. Fred Arthur Diercks on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Fred Diercks?

Fred Diercks is registered in NPPES with the primary taxonomy of Dentist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.