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

ALISON ALDERDICE PSYD
NPI 1487199584
Psychologist in Petaluma, CA

Active since December 27, 2016PECOS Enrolled
PO BOX 544, PETALUMA, CA 94953(415) 505-2133 Get Directions Write a Review

NPPES record last updated: September 15, 2026. Verified against the NPPES registry weekly; last sync: October 04, 2026.

Record update history: Sep 15, 2026, Dec 27, 2016 (2 updates tracked since 2016).

About Alison Alderdice Psyd NPPES

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

ALISON ALDERDICE PSYD (NPI 1487199584) is an individual psychologist in Petaluma, California, licensed in California (28838) and active in the NPI registry since December 2016. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1487199584
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameALISON ALDERDICECredential: PSYD
Location AddressPO BOX 544Petaluma, CA 94953-0544
Mailing AddressPo Box 544Petaluma, CA 94953-0544 · (415) 505-2133
Sole ProprietorNo
Enumeration DateDecember 27, 2016
Last NPPES UpdateSeptember 15, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 15, 2026
✔ NPI 1487199584 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 · 28838
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.
PO BOX 544, Petaluma, CA 94953

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Alison Alderdice Psyd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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 Alison Alderdice's NPI number?

The NPI number for Alison Alderdice is 1487199584. It was assigned to this individual provider in the NPPES registry on December 27, 2016.

Where is Alison Alderdice located?

Alison Alderdice practices at PO Box 544, Petaluma, CA 94953. The listed phone number is (415) 505-2133.

What is Alison Alderdice's specialty?

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

Is Alison Alderdice enrolled in Medicare?

Yes. Alison Alderdice is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Alison Alderdice was last updated on September 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.