MS. HILDA ANN WILLIAMSON LCSW
NPI 1265089312
Social Worker - Clinical in Claremont, CA
About Ms. Hilda Ann Williamson Lcsw NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. HILDA ANN WILLIAMSON LCSW (NPI 1265089312) is an individual clinical provider in Claremont, California, licensed in California (133700) and active in the NPI registry since August 2019. She is enrolled in Medicare PECOS and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
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
Ms. Hilda Ann Williamson Lcsw 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 Reassignment
Medicare enrollment records show Hilda Williamson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Scottsdale, AZ 85253
- Reassigned Medicare billing, California enrollment
- 766 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91711 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CLAREMONT, CA 91711
CLAREMONT, CA 91711
CLAREMONT, CA 91711
CLAREMONT, CA 91711
CLAREMONT, CA 91711
CLAREMONT, CA 91711
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 Hilda Williamson's NPI number?
The NPI number for Hilda Williamson is 1265089312. It was assigned to this individual provider in the NPPES registry on August 23, 2019. The provider is also known as Ms. Hilda Ann Venegas.
Where is Hilda Williamson located?
Hilda Williamson practices at 675 W Foothill Blvd Ste 200, Claremont, CA 91711. The listed phone number is (925) 282-1778.
What is Hilda Williamson's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Hilda Williamson enrolled in Medicare?
Yes. Hilda Williamson 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 organization bills Medicare for Hilda Williamson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Hilda Williamson reassigns Medicare benefits to Pacific Coast Psychiatric Associates Inc (Scottsdale, AZ). The 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 Hilda Williamson'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 Hilda Williamson was last updated on October 22, 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.
# Ms. Hilda Ann Williamson, LCSW · NPI 1265089312
Clinical provider in Claremont, California. Individual provider, active in the CMS NPPES registry since August 23, 2019.
## Identity
- **NPI:** 1265089312 (Entity type: Individual)
- **Enumerated:** August 23, 2019
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** 133700 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 675 W FOOTHILL BLVD STE 200, Claremont, CA 91711-3475
- **Phone:** (925) 282-1778
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Pacific Coast Psychiatric Associates Inc (NPI 1023125465, Scottsdale, AZ), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** October 22, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1265089312) · Data from the CMS NPPES public registry.