Larry Johnston, D.O.
NPI 1386036333ActiveIndividual· Internal Medicine, Gastroenterology· Ames, IA
Internal Medicine, Gastroenterology (D.O.) in Ames, Iowa, trained at Oklahoma State University College of Osteopathic Medicine (class of 2015). In 2024 Medicare paid $85,464 for 418 patients, and Part D covered 685 of their prescriptions, 83% of them generic. Abbvie Inc. was the largest of 9 companies reporting payments in 2025, $436.74 in all, mostly food and beverage.
Overview
| NPI | 1386036333 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | Yes |
| NPI issued | Feb 28, 2015 |
| Last updated in NPPES | Aug 2, 2022 |
| Certified by provider | Aug 2, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 05983 | IA |
| Internal Medicine | 207R00000X | 6004 | OK |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (IA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 418 |
|---|---|
| Services billed | 1,247 across 65 procedure codes |
| Paid by Medicare | $85,464 |
Part D prescriptions in 2024
| Prescriptions (claims) | 685 · 991 30-day fills |
|---|---|
| Patients | 382 |
| Total drug cost | $46,399 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Oklahoma State University College of Osteopathic Medicine |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | Gastroenterology |
Medical group
- McFarland Clinic PCAmes, IA · 363 clinicians
Hospital affiliations
- Mary Greeley Medical CenterAmes, IA
- Van Diest Medical CenterWebster City, IA
Industry payments (Open Payments)
- 2025$436.74 · 19 payments from 9 companies
- 2024$573.85 · 22 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $146.72 | 8 |
| Takeda Pharmaceuticals U.S.A., Inc. | $80.24 | 3 |
| Phathom Pharmaceuticals, Inc. | $61.40 | 1 |
| Gilead Sciences, Inc. | $41.50 | 2 |
| Novo Nordisk Inc | $28.44 | 1 |
What the 2025 payments were for
- Food and Beverage$436.74 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other gastroenterologists in Ames
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- 1811042310
- 1336137306
- 1285622274