Brent Thornton, O.D.
Optometrist · Marshalltown, IA
Brent Thornton, O.D. is an optometrist with a practice address in Marshalltown, Iowa, and NPI 1841545225, issued on Jul 20, 2012. Check the license (Iowa 002556, as entered in NPPES) with the Iowa board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Brent Thornton
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 002556 IA
Self-reported in NPPES; status is on the state search - Practice location
- 501 E Main St, Marshalltown, IA 50158
- Phone
- (641) 752-1511
- Enumerated
- Jul 20, 2012
- Entity
- Type 1 · individual
Also registered at 501 E Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kyle Carnahan, ODOptometrist1184395816
- Collin Edwards, ODOptometrist1780245472
- Connie Feldman, ODOptometrist1245200583
- Kacie Monroe, O.D.Vision Therapy Optometrist1811283799
Verify Brent Thornton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Iowa board licenses this profession
Search for license 002556Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
55% fewer Medicare Part D claims than the average optometrist in 2024
125 Medicare Part D claims for 17 beneficiaries, against an average of 279 among the 32,314 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims.
Most prescribed
- Latanoprost28 claims
- Brimonidine Tartrate26 claims
- Lumigan23 claims
- Timolol Maleate17 claims
- Xiidra14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
One hospital or facility affiliation
- Thornton And Bell PLLCGrimes, IA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
12 optometrist records list a Marshalltown practice address
They are 12 of the 443 NPPES records with a Marshalltown practice address, and 667 optometrist records in Iowa.
All 12 in Marshalltown → All 667 in Iowa → Every provider in Marshalltown →
Other optometrist records in Iowa
- Ryan Ackerman, O.D.Rock Rapids, IA1770692311
- Katie Adams, ODWest Union, IA1710500251
- Paul Ahern, O.D.Dyersville, IA1104892116
- George Alberhasky, O.D., P.C.Iowa City, IA1013036425
- Troy Albrecht, ODMarion, IA1053392522
- Steven Aljets, O.D.West Des Moines, IA1790745602
- Daniel Alletto, ODCenterville, IA1043668700
- John Altfillisch, ODOttumwa, IA1154420172
- Mark Altfillisch, ODOttumwa, IA1093814014
- Jeffrey Anderson, O.D.Boone, IA1760466098
Common questions
What is Brent Thornton, O.D.'s NPI number?
Brent Thornton, O.D.'s National Provider Identifier (NPI) is 1841545225, issued on Jul 20, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Brent Thornton, O.D. located?
The NPPES record lists a practice address at 501 E Main St, Marshalltown, IA, 50158. Phone: (641) 752-1511. Providers update this record themselves, so call before visiting.
How can I verify Brent Thornton, O.D.'s license?
NPPES lists Iowa license number 002556, as entered by the provider. Search the Iowa board that licenses this profession; the NPPES record confirms identity only.
How much does Brent Thornton, O.D. prescribe under Medicare Part D?
In 2024, Brent Thornton, O.D. had 125 Medicare Part D claims for 17 beneficiaries; the average among optometrist prescribers was 279. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.