Active NPI
Robert Geoffrey Gellin, D.M.D., M.H.S.
- Periodontics
- Charleston, SC
National Provider Identifier
1104989847
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Periodontics
- License
- 345
- Practice address
- 173 Ashley Ave
Dental Faculty Practice, BSB Room 346
Charleston, SC 29425-0001 - Phone
- (843) 792-3444
- Fax
- (843) 792-0348
- NPI assigned
- Dec 17, 2006
- Sex
- Male
- Sole proprietor
- Yes
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| General Practice Dentistry | 1223G0001X | 2797 | SC | |
| Periodontics | 1223P0300X | 345 | SC | Primary |
Addresses
Primary practice location
173 Ashley Ave
Dental Faculty Practice, BSB Room 346
Charleston, SC 29425-0001
Mailing address
173 Ashley Ave
Dental Faculty Practice, BSB Room 346
Charleston, SC 29425-0001
Phone (843) 792-3444
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 345 | SC | MD | Periodontist |
| 2797 | SC | MD | Speech-Language Pathologist |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1166313600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1104989847",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "173 ASHLEY AVE",
"address_2": "DENTAL FACULTY PRACTICE, BSB ROOM 346",
"city": "CHARLESTON",
"state": "SC",
"postal_code": "294250001",
"telephone_number": "843-792-3444",
"fax_number": "843-792-0348"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "173 ASHLEY AVE",
"address_2": "DENTAL FACULTY PRACTICE, BSB ROOM 346",
"city": "CHARLESTON",
"state": "SC",
"postal_code": "294250001",
"telephone_number": "843-792-3444",
"fax_number": "843-792-0348"
}
],
"practiceLocations": [],
"basic": {
"last_name": "GELLIN",
"first_name": "ROBERT",
"middle_name": "GEOFFREY",
"name_prefix": "Dr.",
"credential": "D.M.D., M.H.S.",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2006-12-17",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "1223G0001X",
"taxonomy_group": "",
"desc": "Dentist, General Practice",
"state": "SC",
"license": "2797",
"primary": false
},
{
"code": "1223P0300X",
"taxonomy_group": "",
"desc": "Dentist, Periodontics",
"state": "SC",
"license": "345",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Charleston, SC
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.