DR. JUDITH PHILLIPS SILL PHD
NPI 1881740025
Psychologist in Mendocino, CA

Active since January 27, 2007Opted out of Medicare · through Oct 1, 2027
45121 UKIAH STREET, SUITE G, MENDOCINO, CA 95460(707) 937-3000(707) 937-3373 Get Directions Write a Review

NPPES record last updated: December 13, 2013. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Judith Phillips Sill Phd NPPES

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

DR. JUDITH PHILLIPS SILL PHD (NPI 1881740025) is an individual psychologist in Mendocino, California, licensed in California (PSY 7543) and active in the NPI registry since January 2007. She has opted out of Medicare through October 1, 2027.

NPPES Registry Identity

NPI1881740025
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameDR. JUDITH PHILLIPS SILLCredential: PHD
Location Address45121 UKIAH STREET, SUITE GMendocino, CA 95460
Mailing AddressPo Box 65Elk, CA 95432-0065 · (707) 937-3000 · Fax (707) 937-3373
Fax(707) 937-3373
Sole ProprietorYes
Enumeration DateJanuary 27, 2007
Last NPPES UpdateDecember 13, 2013
NPI 1881740025 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License Licensed in CA · PSY 7543
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.
45121 UKIAH STREET, Mendocino, CA 95460

Other Identifiers 2

MedicaidPSY075430CA
Medicare PINCP7543ACA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

Opted out of Medicare

Dr. Judith Phillips Sill 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 October 1, 2023 through October 1, 2027.

Opt-Out Effective DateOctober 1, 2023
Opt-Out In Effect ThroughOctober 1, 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.

Marriage & Family Therapist
45121 UKIAH STREET, SUITE C
MENDOCINO, CA 95460

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 Judith Sill's NPI number?

The NPI number for Judith Sill is 1881740025. It was assigned to this individual provider in the NPPES registry on January 27, 2007.

Where is Judith Sill located?

Judith Sill practices at 45121 Ukiah Street Suite G, Mendocino, CA 95460. The listed phone number is (707) 937-3000.

What is Judith Sill's specialty?

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

Is Judith Sill enrolled in Medicare?

No. Judith Sill has opted out of Medicare through October 1, 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 Judith Sill was last updated on December 13, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years 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.