Dr. Dennis Michael O'Brien, DDS

Dr. Dennis Michael O'Brien is a Dentist provider (Dentist) practicing in La Mesa, CA, registered in the NPPES registry with NPI 1023267408 since 2008. The credential DDS stands for Doctor of Dental Surgery. Practices at Lake Murray Dental Group (listed at the same practice address in NPPES).

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NPI	1023267408
Entity type	Individual (Type 1)
Name	Dr. Dennis Michael O'Brien
Credential	DDS
Sex	Male
Practice address	5308 LAKE MURRAY BLVD, SUITE D, La Mesa, CA, 91942
Phone	6193372970
Enumeration date	2008-09-10
Last updated in NPPES	2016-09-12

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
122300000X	Dentist	Secondary	2008024051	MO
122300000X	Dentist	Primary	57392	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: Dennis O'Brien, DDS
NPI: 1023267408
Taxonomy: 122300000X (Dentist)
Address: 5308 LAKE MURRAY BLVD, SUITE D, La Mesa, CA, 91942

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1487762233	Jerry Herring	Individual	General Practice Dentistry	La Mesa, CA
1366659203	Allen Wei	Individual	Endodontics	La Mesa, CA
1629269998	Lake Murray Dental Group	Organization	Dentist	La Mesa, CA
1033427117	Stephen Mann	Individual	Dentist	La Mesa, CA

Verify this record

Cross-check NPI 1023267408 against the authoritative CMS record: view Dr. Dennis Michael O'Brien 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

What is the NPI number for Dennis O'Brien?

The National Provider Identifier (NPI) for Dennis O'Brien is 1023267408, a Type 1 (individual) record in the CMS NPPES registry.

Where does Dennis O'Brien practice?

The practice location on file with NPPES is in La Mesa, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2016-09-12.