JAMES WILLIAM HAMILL
NPI 1700345212
Psychologist in Fullerton, CA
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
Specialties & Licenses
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.
Medicare Billing Reassignments
2Medicare 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.
Monrovia, CA 91016
- Reassigned Medicare billing, California enrollment
- 4 clinicians in this Medicare group
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.