THALIA PITSILLIDOU SULLIVAN NICHOLSON PHD
NPI 1760053136
Psychologist in Auburn, CA

Active since July 07, 2021Opted out of Medicare · through Feb 17, 2028

NPPES record last updated: February 26, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Thalia Pitsillidou Sullivan Nicholson Phd NPPES

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

THALIA PITSILLIDOU SULLIVAN NICHOLSON PHD (NPI 1760053136) is an individual psychologist in Auburn, California, licensed in California (35995) and active in the NPI registry since July 2021. She has opted out of Medicare through February 17, 2028.

NPPES Registry Identity

NPI1760053136
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameTHALIA PITSILLIDOU SULLIVAN NICHOLSONCredential: PHD
Location Address140 PINE STAuburn, CA 95603-5247
Mailing Address5701 Lonetree Blvd Ste 113Rocklin, CA 95765-3792 · (530) 423-3714
Sole ProprietorNo
Enumeration DateJuly 7, 2021
Last NPPES UpdateFebruary 26, 2026
NPPES CertifiedFebruary 26, 2026
NPI 1760053136 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
Licenses Licensed in CA · 35995 Licensed in NV · 1300
Definition
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
140 PINE ST, Auburn, CA 95603

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

Opted out of Medicare

Thalia Pitsillidou Sullivan Nicholson Phd 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 February 17, 2026 through February 17, 2028.

Opt-Out Effective DateFebruary 17, 2026
Opt-Out In Effect ThroughFebruary 17, 2028Opt-out affidavits renew automatically every two years unless cancelled

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 Thalia Sullivan Nicholson's NPI number?

The NPI number for Thalia Sullivan Nicholson is 1760053136. It was assigned to this individual provider in the NPPES registry on July 7, 2021.

Where is Thalia Sullivan Nicholson located?

Thalia Sullivan Nicholson practices at 140 Pine St, Auburn, CA 95603. The listed phone number is (530) 423-3714.

What is Thalia Sullivan Nicholson's specialty?

The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.

Is Thalia Sullivan Nicholson enrolled in Medicare?

No. Thalia Sullivan Nicholson has opted out of Medicare through February 17, 2028. 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 Thalia Sullivan Nicholson was last updated on February 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months 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.