Active NPI
Brent Thornton, O.D.
- Optometrist
- Grimes, IA
National Provider Identifier
1841545225
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Optometrist
- License
- 002556
- Practice address
- 300 W 1St St
Grimes, IA 50111-4919 - Phone
- (515) 986-2821
- NPI assigned
- Jul 20, 2012
- Last updated
- Sep 23, 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 |
|---|---|---|---|---|
| Optometrist | 152W00000X | 002556 | IA | Primary |
Addresses
Primary practice location
300 W 1St St
Grimes, IA 50111-4919
Mailing address
6627 Hampton CT
Johnston, IA 50131-2985
Phone (712) 261-1915
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in IA
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: No
- Hospice: Yes
Enrollment records 1
Care Compare profile
Medicare Care Compare- Specialty
- Optometry
- Education
- Southern College of Optometry, 2012
- Medicare assignment
- May accept Medicare assignment
- Group practices
Practice addresses (Care Compare)
270 W 1St St
Suite H
Grimes, IA 50111-2145
Phone (515) 986-2821
Procedures performed for Medicare patients
| Procedure | Number of procedures |
|---|---|
| Cataract surgery | 1-10 |
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 002556 | IA | MD | Optometrist |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Thornton & Bell PLLC | Current | Accepting new patients | |
| Marshalltown Vision P.C. | Optometrist | Past | Accepting new patients |
Locations
270 W 1st St
Ste H
Grimes, IA 50111
Phone (515) 320-1375
Organizations & group practices 3
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.
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1342742400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1790121600000",
"number": "1841545225",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "6627 HAMPTON CT",
"city": "JOHNSTON",
"state": "IA",
"postal_code": "501312985",
"telephone_number": "712-261-1915"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "300 W 1ST ST",
"city": "GRIMES",
"state": "IA",
"postal_code": "501114919",
"telephone_number": "515-986-2821"
}
],
"practiceLocations": [],
"basic": {
"last_name": "THORNTON",
"first_name": "BRENT",
"name_prefix": "Dr.",
"credential": "O.D.",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2012-07-20",
"last_updated": "2026-09-23",
"certification_date": "2026-09-23",
"status": "A"
},
"taxonomies": [
{
"code": "152W00000X",
"taxonomy_group": "",
"desc": "Optometrist",
"state": "IA",
"license": "002556",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Grimes, IA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 23, 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.