Active NPI
Grant Ronald Layton, D.M.D.
- Endodontics
- Tamuning, GU
National Provider Identifier
1588918908
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Endodontics
- License
- 8311802-9922
- Practice address
- 50 Farenholt Ave
Tamuning, GU 96913-3106 - Phone
- (671) 344-9269
- NPI assigned
- Nov 7, 2012
- Last updated
- Feb 9, 2026
- 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 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Endodontics | 1223E0200X | 8311802-9922 | UT | Primary |
Addresses
Primary practice location
50 Farenholt Ave
Tamuning, GU 96913-3106
Mailing address
PSC 455 Box 208
Fpo, AP 96540-0003
Phone (671) 344-9269
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 |
|---|---|---|---|
| 8311802-9922 | UT | MD | Endodontist |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| United States Navy | Past | Accepting new patients |
Organizations & group practices 1
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.
-
- Military Hospital
- Camp Pendleton, CA
- NPI 1942554373
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1352246400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1770595200000",
"number": "1588918908",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "MIL",
"address_1": "PSC 455 BOX 208",
"city": "FPO",
"state": "AP",
"postal_code": "965400003",
"telephone_number": "671-344-9269"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "50 FARENHOLT AVE",
"city": "TAMUNING",
"state": "GU",
"postal_code": "969133106",
"telephone_number": "671-344-9269"
}
],
"practiceLocations": [],
"basic": {
"last_name": "LAYTON",
"first_name": "GRANT",
"middle_name": "RONALD",
"name_prefix": "Dr.",
"credential": "D.M.D.",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2012-11-07",
"last_updated": "2026-02-09",
"certification_date": "2026-02-09",
"status": "A"
},
"taxonomies": [
{
"code": "1223E0200X",
"taxonomy_group": "",
"desc": "Dentist, Endodontics",
"state": "UT",
"license": "8311802-9922",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Tamuning, GU
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 9, 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.