What is Mary O'Connor's NPI number?

Mary O'Connor's National Provider Identifier (NPI) is 1881750545, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Mary O'Connor's specialty?

Mary O'Connor is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).

Where is Mary O'Connor located?

Mary O'Connor's practice location on file with NPPES is 2131 Victoria Dr, Fullerton, CA 92831-2133.

What is Mary O'Connor's phone number?

The practice phone number listed in the NPPES registry for Mary O'Connor is (714) 206-3900.

Is Mary O'Connor's NPI active?

Yes — Mary O'Connor's NPI (1881750545) is active in the NPPES registry as of the last update on 2026-03-12.

IndividualActive

Mary O'Connor, MFT

NPI 1881750545 · Mental Health Counselor · Fullerton, CA

Mary O'Connor, MFT is a Mental Health Counselor provider in Fullerton, CA (NPI 1881750545).

Provider details

NPI number: 1881750545
Entity type: Individual
Primary specialty: Mental Health CounselorBehavioral Health & Social Service Providers
Credential: MFT
Sex: Female
Sole proprietor: Yes
License: 20293 (CA)

Specialties & taxonomies

Mental Health CounselorPrimary101YM0800XLicense 20293 (CA)
Behavioral Health & Social Service Providers

Profile Score

Detailed profile(90/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
19 yrs in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

2131 Victoria Dr

Fullerton, CA 92831-2133

Phone: (714) 206-3900

Street-level locationGet directions

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Mailing address