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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

MRS. MARIA S XANTHOS MFT
NPI 1235101577
Marriage & Family Therapist in Fullerton, CA

Active since February 02, 2006Opted out of Medicare · through Sep 5, 2027
440 E COMMONWEALTH AVE, FULLERTON, CA 92832(714) 526-0758(714) 680-3315 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Mrs. Maria S Xanthos Mft NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MRS. MARIA S XANTHOS MFT (NPI 1235101577) is an individual marriage & family therapist in Fullerton, California, licensed in California (MSC29896) and active in the NPI registry since February 2006. She has opted out of Medicare through September 5, 2027.

NPPES Registry Identity

NPI1235101577
Entity TypeIndividualFemale
Primary Taxonomy106H00000X
Provider Legal NameMRS. MARIA S XANTHOSCredential: MFT
Location Address440 E COMMONWEALTH AVEFullerton, CA 92832
Mailing AddressPo Box 5255Fullerton, CA 92838-0255 · (714) 526-0758 · Fax (714) 680-3315
Phone(714) 526-0758
Fax(714) 680-3315
Sole ProprietorNo
Enumeration DateFebruary 2, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1235101577 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyMarriage & Family TherapistBehavioral Health & Social Service Providers
Taxonomy Code106H00000X
License✔ Licensed in CA · MSC29896
Definition
A marriage and family therapist is a person with a master's degree in marriage and family therapy, or a master's or doctoral degree in a related mental health field with substantially equivalent coursework in marriage and family therapy, who receives supervised clinical experience, or a person who meets the state requirements to practice as a marriage and family therapist. A marriage and family therapist treats mental and emotional disorders within the context of marriage and family systems. A marriage and family therapist provides mental health and counseling services to individuals, couples, families, and groups.
440 E COMMONWEALTH AVE, Fullerton, CA 92832
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Other Names 1

Professional Name (2)Mrs. Maria S Xanthos Hilding

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Mrs. Maria S Xanthos Mft has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from September 5, 2025 through September 5, 2027.

Opt-Out Effective DateSeptember 5, 2025
Opt-Out In Effect ThroughSeptember 5, 2027Opt-out affidavits renew automatically every two years unless cancelled

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. MERCEDES GALANTE PH.D.
Psychologist
440 E COMMONWEALTH AVE
FULLERTON, CA 92832
Orange County (714) 284-9609

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Maria Xanthos's NPI number?

The NPI number for Maria Xanthos is 1235101577. It was assigned to this individual provider in the NPPES registry on February 2, 2006. The provider is also known as Mrs. Maria S Xanthos Hilding.

Where is Maria Xanthos located?

Maria Xanthos practices at 440 E Commonwealth Ave, Fullerton, CA 92832. The listed phone number is (714) 526-0758.

What is Maria Xanthos's specialty?

The primary specialty registered for this NPI is Marriage & Family Therapist with taxonomy code 106H00000X.

Is Maria Xanthos enrolled in Medicare?

No. Maria Xanthos has opted out of Medicare through September 5, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out.

When was this NPI record last updated?

The NPPES record for Maria Xanthos was last updated on July 13, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.