Grant P. Williams, M.D.

Primary specialty

Interventional Pain Medicine PhysicianTaxonomy code 208VP0014X

License

A54235 Issued in CA

Practice address

716 W Broadway Ste 200
Glendale, CA 91204-1010

Phone

(877) 331-3878

NPI assigned

Feb 1, 2007

Last updated

Aug 19, 2026By the provider in NPPES

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Interventional Pain ManagementAlso: Anesthesiology, Pain Management

Education

Other, 1991

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: grant.williams@opsl-ca.direct.office.nextgen.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Hope Community Care Clinic, Inc

  • Community Health Clinic/Center
  • Calexico, CA
  • NPI 1720853237
  Medicare reassignment NPD
• GPW Interventional Pain Management, a Professional Corporation

  • Interventional Pain Medicine Physician
  • West Covina, CA
  • NPI 1124498274
  Authorized official Same address or phone
• Onyx Pain Management Medical Corporation

  • Pain Clinic/Center
  • West Covina, CA
  • NPI 1851944110
  NPD
• DO Medical Corporation

  • Neuromuscular Medicine (Physical Medicine & Rehabilitation) Physician
  • Glendale, CA
  • NPI 1437723145
  NPD (past)
• Millcreek Ambulatory Surgery Center

  • Ambulatory Surgical Clinic/Center
  • Visalia, CA
  • NPI 1770906141
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1170288000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787097600000",
    "number": "1013055128",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2275 HUNTINGTON DR STE 371",
            "city": "SAN MARINO",
            "state": "CA",
            "postal_code": "911082640",
            "telephone_number": "877-331-3878",
            "fax_number": "888-578-6188"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "716 W BROADWAY STE 200",
            "city": "GLENDALE",
            "state": "CA",
            "postal_code": "912041010",
            "telephone_number": "877-331-3878"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1250 S Sunset Ave Ste 206",
            "address_purpose": "LOCATION",
            "city": "West Covina",
            "state": "CA",
            "postal_code": "917903962",
            "country_code": "US",
            "telephone_number": "877-331-3878",
            "fax_number": "888-578-6188",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "WILLIAMS",
        "first_name": "GRANT",
        "middle_name": "P.",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2007-02-01",
        "last_updated": "2026-08-19",
        "certification_date": "2026-08-19",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208VP0014X",
            "taxonomy_group": "",
            "desc": "Pain Medicine, Interventional Pain Medicine",
            "state": "CA",
            "license": "A54235",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• David Wilhoite
• William F. Reynolds, M.D., Inc.
• William W Loebman, M.D., Inc
• Byron Williams, M.D.
• Donald J Williams, M.D.
• Jade Lynnay Williams
• Renee D Williams, LMFT
• Willow Brook Critical Care Medical Group, Inc
• Willow Home Health
• Willow Tree Therapy

• Interventional Pain Medicine Physician in Glendale, CA
• Providers in Glendale, CA by specialty
• Interventional Pain Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 19, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.