Dr. Cooper Differding, D.D.S

Dr. Cooper Differding is a Dentist provider (Dentist) practicing in Mill Valley, CA, registered in the NPPES registry with NPI 1588011845 since 2016. The credential DDS stands for Doctor of Dental Surgery.

✓ Active NPI ✓ Valid NPI checksum

NPI	1588011845
Entity type	Individual (Type 1)
Name	Dr. Cooper Differding
Credential	D.D.S
Sex	Male
Practice address	10 WILLOW ST, Mill Valley, CA, 94941
Phone	4153886100
Fax	4153886100
Enumeration date	2016-05-17
Last updated in NPPES	2018-03-17

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
122300000X	Dentist	Primary	64885	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: Cooper Differding, D.D.S
NPI: 1588011845
Taxonomy: 122300000X (Dentist)
Address: 10 WILLOW ST, Mill Valley, CA, 94941

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1629051271	Nancy Case	Individual	Psychologist	Mill Valley, CA
1801091319	Barbara Nelson	Individual	Marriage & Family Therapist	Mill Valley, CA
1124269972	Patricia Holden	Individual	Marriage & Family Therapist	Mill Valley, CA

Verify this record

Cross-check NPI 1588011845 against the authoritative CMS record: view Dr. Cooper Differding 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 Cooper Differding?

Cooper Differding 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 2018-03-17.