JAMES WILLIAM HAMILL
NPI 1700345212
Psychologist in Fullerton, CA

Active since March 14, 2019PECOS EnrolledAccepts Medicare Assignment
236 SOCO DR, FULLERTON, CA 92832(949) 414-6182 Get Directions Write a Review

NPPES record last updated: November 12, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 12, 2025, Jan 6, 2025, Mar 14, 2019 (3 updates tracked since 2019).

About James William Hamill NPPES

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

JAMES WILLIAM HAMILL (NPI 1700345212) is an individual psychologist in Fullerton, California, licensed in California (35658) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS and is a graduate of Other (2023).

NPPES Registry Identity

NPI1700345212
Entity TypeIndividualMale
Primary Taxonomy103T00000X
Provider Legal NameJAMES WILLIAM HAMILL
Location Address236 SOCO DRFullerton, CA 92832-2475
Mailing Address236 Soco DrFullerton, CA 92832-2475
Sole ProprietorYes
Medical School CMSOtherGraduated 2023
Enumeration DateMarch 14, 2019
Last NPPES UpdateNovember 12, 20253 updates tracked since enumeration
NPPES CertifiedNovember 12, 2025
✔ NPI 1700345212 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 · 35658
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.
236 SOCO DR, Fullerton, CA 92832

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

James William Hamill is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID446780795
PECOS Enrollment IDI20250313001808
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.

Medicare Billing Reassignments

2

Medicare enrollment records show James Hamill reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Clinical
521 1/2 S MYRTLE AVE, #9/10
Monrovia, CA 91016
  • Reassigned Medicare billing, California enrollment
  • 4 clinicians in this Medicare group
Addiction Medicine
4633 OLD IRONSIDES DR STE 304
Santa Clara, CA 95054
  • Reassigned Medicare billing, California enrollment
  • 1,607 clinicians in this Medicare group

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 James Hamill's NPI number?

The NPI number for James Hamill is 1700345212. It was assigned to this individual provider in the NPPES registry on March 14, 2019.

Where is James Hamill located?

James Hamill practices at 236 Soco Dr, Fullerton, CA 92832. The listed phone number is (949) 414-6182.

What is James Hamill's specialty?

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

Is James Hamill enrolled in Medicare?

Yes. James Hamill is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for James Hamill's services?

According to the CMS Revalidation Reassignment List (October 2026 release), James Hamill reassigns Medicare benefits to 2 organizations: Healing Rhythms Psychology Inc (Monrovia, CA) and Sud Specialty Group - Ca (Santa Clara, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for James Hamill's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for James Hamill was last updated on November 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.