GRANT P. WILLIAMS M.D.
NPI 1013055128
Pain Medicine - Interventional Pain Medicine in Glendale, CA
About Grant P. Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GRANT P. WILLIAMS M.D. (NPI 1013055128) is an individual interventional pain medicine provider in Glendale, California, licensed in California (A54235) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, maintains a secondary practice location in West Covina, and is a graduate of Other (1991).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 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
Grant P. Williams M.d. 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 Grant Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Calexico, CA 92231
- Reassigned Medicare billing, California enrollment
- 2 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91204 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Grant Williams's NPI number?
The NPI number for Grant Williams is 1013055128. It was assigned to this individual provider in the NPPES registry on February 1, 2007.
Where is Grant Williams located?
Grant Williams practices at 716 W Broadway Ste 200, Glendale, CA 91204. The listed phone number is (877) 331-3878.
What is Grant Williams's specialty?
The primary specialty registered for this NPI is Pain Medicine, specializing in Interventional Pain Medicine, with taxonomy code 208VP0014X.
Is Grant Williams enrolled in Medicare?
Yes. Grant Williams 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 Grant Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Grant Williams reassigns Medicare benefits to Hope Community Care Clinic, Inc (Calexico, CA). 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 Grant Williams'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 Grant Williams was last updated on August 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Grant P. Williams, M.D. · NPI 1013055128
Interventional Pain Medicine physician in Glendale, California. Individual provider, active in the CMS NPPES registry since February 1, 2007.
## Identity
- **NPI:** 1013055128 (Entity type: Individual)
- **Enumerated:** February 1, 2007
- **Primary specialty:** Pain Medicine - Interventional Pain Medicine · taxonomy 208VP0014X
- **State license:** A54235 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 716 W BROADWAY STE 200, Glendale, CA 91204-1010
- **Phone:** (877) 331-3878
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Hope Community Care Clinic, Inc (NPI 1720853237, Calexico, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1991
## Record status
- **NPPES last updated:** August 19, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1013055128) · Data from the CMS NPPES public registry.