John Marshall Gregg, DDS

Primary specialty

Oral and Maxillofacial Surgery (Dentist)Taxonomy code 1223S0112X

License

0401005828 Issued in VA

Practice address

100 Professional Park Dr SE
Suite 1
Blacksburg, VA 24060-6665

Phone

(540) 951-8777

Fax

(540) 951-9642

NPI assigned

Oct 31, 2005

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

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.

• NRV Oral & Maxillofacial Surgery, LTD

  • Oral and Maxillofacial Surgery (Dentist)
  • Blacksburg, VA
  • NPI 1013097195
  NPD (past)

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

{
    "created_epoch": "1130716800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1639160575",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "100 PROFESSIONAL PARK DR SE",
            "address_2": "SUITE 1",
            "city": "BLACKSBURG",
            "state": "VA",
            "postal_code": "240606665",
            "telephone_number": "540-951-8777",
            "fax_number": "540-951-9642"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 PROFESSIONAL PARK DR SE",
            "address_2": "SUITE 1",
            "city": "BLACKSBURG",
            "state": "VA",
            "postal_code": "240606665",
            "telephone_number": "540-951-8777",
            "fax_number": "540-951-9642"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GREGG",
        "first_name": "JOHN",
        "middle_name": "MARSHALL",
        "name_prefix": "Dr.",
        "credential": "DDS",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-10-31",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1223S0112X",
            "taxonomy_group": "",
            "desc": "Dentist, Oral and Maxillofacial Surgery",
            "state": "VA",
            "license": "0401005828",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "8017808",
            "state": "VA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Sierra Harvest Gray
• Casey Alan Graybill, NP
• Hayley Graybill, FNP-C
• Elizabeth R Green, LCSW, LMSW, QMHP-C
• Rachel Alice Greene, M.S. CCC-SLP
• Brett Griesemer, MAED, ATC
• Franklin Griffey, LPC
• Kati Griggs, LPC
• Lonnie Gross Jr., ATC
• Philip E Grubbs, MD

• Oral and Maxillofacial Surgery (Dentist) in Blacksburg, VA
• Providers in Blacksburg, VA by specialty
• Oral and Maxillofacial Surgery (Dentist) in Virginia

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.