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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MS. MARILYN GAIL TONNESON MFT
NPI 1679541486
Marriage & Family Therapist in Atascadero, CA

Active since March 08, 2006
4555 EL CAMINO REAL, SUITE G, ATASCADERO, CA 93422(805) 461-1711(805) 461-0620 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Ms. Marilyn Gail Tonneson Mft NPPES

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

MS. MARILYN GAIL TONNESON MFT (NPI 1679541486) is an individual marriage & family therapist in Atascadero, California, licensed in California (MFC 19856) and active in the NPI registry since March 2006.

NPPES Registry Identity

NPI1679541486
Entity TypeIndividualFemale
Primary Taxonomy106H00000X
Provider Legal NameMS. MARILYN GAIL TONNESONCredential: MFT
Location Address4555 EL CAMINO REAL, SUITE GAtascadero, CA 93422-2700
Mailing Address4555 El Camino Real, Suite GAtascadero, CA 93422-2700 · (805) 461-1711 · Fax (805) 461-0620
Phone(805) 461-1711
Fax(805) 461-0620
Sole ProprietorNo
Enumeration DateMarch 8, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1679541486 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 · MFC 19856
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.
4555 EL CAMINO REAL, Atascadero, CA 93422
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Other Providers at the Same Location NPPES 5

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

COMMUNITY HEALTH CENTERS OF THE CENTRAL COAST, INC.
Family Medicine
4555 EL CAMINO REAL
ATASCADERO, CA 93422
San Luis Obispo County (805) 466-9001
MR. RAYMOND MONTE FORD L.C.S.W.
Social Worker (Clinical)
4555 EL CAMINO REAL, SUITE G
ATASCADERO, CA 93422
San Luis Obispo County (805) 534-3943
DR. STANLEY MUENTER DDS
Dentist (Prosthodontics)
4555 EL CAMINO REAL, SUITE F
ATASCADERO, CA 93422
San Luis Obispo County (805) 461-3147
STANLEY L. MUENTER DDS, A DENTAL CORPORATION
Dentist (Prosthodontics)
4555 EL CAMINO REAL, SUITE F
ATASCADERO, CA 93422
San Luis Obispo County (805) 461-3147
DR. MARK JAMES ROMANELLI DDS
Dentist (General Practice)
4555 EL CAMINO REAL, STE. D
ATASCADERO, CA 93422
San Luis Obispo County (805) 461-1772

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 Marilyn Tonneson's NPI number?

The NPI number for Marilyn Tonneson is 1679541486. It was assigned to this individual provider in the NPPES registry on March 8, 2006.

Where is Marilyn Tonneson located?

Marilyn Tonneson practices at 4555 El Camino Real Suite G, Atascadero, CA 93422. The listed phone number is (805) 461-1711.

What is Marilyn Tonneson's specialty?

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

When was this NPI record last updated?

The NPPES record for Marilyn Tonneson was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 42 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.