Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mary Kathleen Addonizio, DDS

Dentist in Mission Viejo, CA · enumerated 2006.

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

National Provider Identifier

1699850636

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Registry record

Entity type Individual (Type 1)

Name Dr. Mary Kathleen Addonizio

Credential DDS

Sex Female

Practice address 26932 Oso Pkwy, Suite 210, Mission Viejo, CA, 92691

Phone (949) 582-2325

Fax (949) 582-8631

Enumeration date Oct 26, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

122300000X Dentist Dental Providers · License 35214 (CA) Primary

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

What is the NPI number for Mary Addonizio?

The National Provider Identifier (NPI) for Mary Addonizio is 1699850636, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mary Addonizio practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.