William Spencer Grigg, D.O.

Primary specialty

Clinical Cardiac Electrophysiology PhysicianTaxonomy code 207RC0001X

License

E18962 Issued in AR

Practice address

555 W 6TH St
Mountain Home, AR 72653-3409

Phone

(870) 425-8288

Fax

(870) 425-8299

NPI assigned

Apr 18, 2018

Sex

Male

Sole proprietor

No

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

Specialties & licenses 5

Addresses

Medicare fee-for-service enrollment

Enrolled in CO, FL, NY3 enrollments

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 3

Specialty

Internal Medicine

Education

Other, 2018

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Virtumedex of Florida PAGroup PAC ID 8224538236, 4 clinicians

Harbor Medical of New York PCGroup PAC ID 8820563513, 4 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy, Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: william.grigg@393409484357636.direct.elationemr.com

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

• Harbor Medical of New York PC

  • Internal Medicine Physician
  • Franklin Square, NY
  • NPI 1669329306
  Medicare reassignment Care Compare group Authorized official
• Virtumedex of Florida PA

  • General Practice Physician
  • Naples, FL
  • NPI 1013807494
  Medicare reassignment Care Compare group NPD
• Colorado Hospitalist Services, PLLC

  • Hospitalist Physician
  • Englewood, CO
  • NPI 1265806178
  Medicare reassignment NPD
• Inpatient Services, PC

  • Internal Medicine Physician
  • Brighton, CO
  • NPI 1710999768
  Medicare reassignment NPD
• Poudre Valley Medical Group, LLC

  • General Practice Physician
  • Loveland, CO
  • NPI 1225356868
  Medicare reassignment NPD
• Signify Health Medical Associates, PLLC

  • General Practice Physician
  • Dallas, TX
  • NPI 1750845863

  CO

  Medicare reassignment NPD
• Colorado Hospitalist Services, PLLC

  • Hospitalist Physician
  • Denver, CO
  • NPI 1669115747
  NPD
• Inpatient Services, PC

  • Internal Medicine Physician
  • Littleton, CO
  • NPI 1376388868
  NPD
• Inpatient Services, PC

  • Internal Medicine Physician
  • Longmont, CO
  • NPI 1851907489
  NPD
• Portercare Adventist Health System

  • Hematology & Oncology Physician
  • Littleton, CO
  • NPI 1447372693
  NPD
• Portercare Adventist Health System

  • Otolaryngology Physician
  • Greenwood Village, CO
  • NPI 1760761928
  NPD
• Portercare Adventist Health System

  • Urology Physician
  • Lakewood, CO
  • NPI 1942165626
  NPD

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

{
    "created_epoch": "1524009600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786579200000",
    "number": "1578050266",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 707",
            "city": "MOUNTAIN HOME",
            "state": "AR",
            "postal_code": "726540707",
            "telephone_number": "870-424-7070",
            "fax_number": "870-424-6616"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "555 W 6TH ST",
            "city": "MOUNTAIN HOME",
            "state": "AR",
            "postal_code": "726533409",
            "telephone_number": "870-425-8288",
            "fax_number": "870-425-8299"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GRIGG",
        "first_name": "WILLIAM",
        "middle_name": "SPENCER",
        "name_prefix": "Dr.",
        "credential": "D.O.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-04-18",
        "last_updated": "2026-08-13",
        "certification_date": "2026-08-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "CO",
            "license": "TL.0007279",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CO",
            "license": "TL.0007279",
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "CO",
            "license": "DR.0062850",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CO",
            "license": "DR.0062850",
            "primary": false
        },
        {
            "code": "207RC0001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Clinical Cardiac Electrophysiology",
            "state": "AR",
            "license": "E18962",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Franklin John Gray Jr., M.D.
• Justin O Green, LPC
• Sydney Desira Greene, DPT
• Susan Gregory
• Teresa Mary Frances Grigg, BSN, RN
• Nadah Griggs, MHPP
• Gross Therapy Services, Inc.
• Lance Gross, PT
• Isabella Guajardo Sant, MD
• Carroll Guest, MHPP

• Clinical Cardiac Electrophysiology Physician in Mountain Home, AR
• Providers in Mountain Home, AR by specialty
• Clinical Cardiac Electrophysiology Physician in Arkansas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 13, 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.