Larry Johnston, D.O.
Gastroenterology Physician · Ames, IA
Larry Johnston, D.O. is a gastroenterology physician with a practice address in Ames, Iowa, and NPI 1386036333, issued on Feb 28, 2015. Check the license (Iowa 05983, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Larry Johnston
- Credential
- D.O.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 05983 IA
6004 OK
Self-reported in NPPES; status is on the state search - Practice location
- 1215 Duff Ave, Ames, IA 50010
- Phone
- (515) 239-4450
- Enumerated
- Feb 28, 2015
- Record last updated
- Aug 2, 2022
- Medicare enrollment
- Enrolled (PECOS I20220609002409); accepts Medicare assignment
- Medical or professional school
- Oklahoma State University College Of Osteopathic Medicine, 2015
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 122 in Iowa → Look up another NPI →
Also registered at 1215 Duff Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christopher AlbertPharmacist1811480056
- Jill AlexanderPediatrics Physician1851387591
- Rupal Amin, M.D.Internal Medicine Physician1225024995
- Trisha Andersen, DOAnatomic Pathology & Clinical Pathology Physician1518917947
- Randy Anderson, MDDiagnostic Radiology Physician1912115288
- Manuel Arbelaez Agudelo, MDInternal Medicine Physician1093237562
Verify Larry Johnston in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 05983Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average gastroenterology physician in 2024
685 Medicare Part D claims for 382 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Sod Sulf-Potass Sulf-Mag Sulf222 claims
- Omeprazole183 claims
- Gavilyte-G51 claims
- Peg-3350 And Electrolytes26 claims
- Nortriptyline Hcl18 claims
- Famotidine17 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.
Industry payments in 2024: $573.85
21 payments; by number, the most common kind was food and beverage; the largest payer was Phathom Pharmaceuticals, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Mcfarland Clinic PCAmes, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Larry Johnston among 122 gastroenterology physician records in Iowa
Larry Johnston, D.O. is one of 122 gastroenterology physician records with a practice address in Iowa. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 80% of them.
- NPI issued2015 · 80% of these records are older, 16% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2015 · median 2000 among the 84 with a school on file
- Record last updated2022 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Iowa
There are 122 gastroenterology physician records in Iowa.
All 122 in Iowa → Every provider in Ames → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Bryan Feyen, DOAmes, IA 500101811042310
- Jeremy Fields, MDAmes, IA 500101285844142
- Jon Fleming, M.D.Ames, IA 500101285622274
- Robert Graveline, M.D.Ames, IA 500141336137306
- Thomas Johnson, M.D.Nevada, IA 502011639168685
- Jon Gibson, M.D.West Des Moines, IA 502661720072507
- Joel Hade, M.D.West Des Moines, IA 502661184618720
- Shawn Hancock, D.O.West Des Moines, IA 502661467410720
Common questions
What is Larry Johnston, D.O.'s NPI number?
Larry Johnston, D.O.'s National Provider Identifier (NPI) is 1386036333, issued on Feb 28, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Larry Johnston, D.O. located?
The NPPES record lists a practice address at 1215 Duff Ave, Ames, IA, 50010. Phone: (515) 239-4450. Providers update this record themselves, so call before visiting.
How can I verify Larry Johnston, D.O.'s license?
NPPES lists Iowa license number 05983, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Larry Johnston, D.O. prescribe under Medicare Part D?
In 2024, Larry Johnston, D.O. had 685 Medicare Part D claims for 382 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 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.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.