John Ashton Armstrong, DO
NPI 1427679232ActiveIndividual· Internal Medicine· Rolla, MO
Internal Medicine (DO) in Rolla, Missouri, trained at At Still University of Health Sciences, College of Osteo Med, Kirksville (class of 2020). Their prescriptions cost Medicare Part D more than their services did: $286,373 for 3,854 claims, against $56,635 paid for services in 2024. Dexcom, Inc. was the largest of 17 companies reporting payments in 2025, $797.66 in all, mostly food and beverage.
Overview
| NPI | 1427679232 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | May 3, 2020 |
| Last updated in NPPES | Feb 27, 2024 |
| Certified by provider | Feb 27, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 2023028809 | MO |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 266 |
|---|---|
| Services billed | 718 across 20 procedure codes |
| Paid by Medicare | $56,635 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,854 · 6,052 30-day fills |
|---|---|
| Patients | 462 |
| Total drug cost | $286,373 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | At Still University of Health Sciences, College of Osteo Med, Kirksville |
|---|---|
| Graduation year | 2020 |
| Medicare specialty | Internal Medicine |
Medical group
- Pcrmc Medical Group IncWaynesville, MO · 120 clinicians
Hospital affiliations
- Mercy Hospital LebanonLebanon, MO
- Phelps County Regional Medical CenterRolla, MO
Other facilities
- Centerwell Home HealthHome health agency · Rolla, MO
- Phelps Health Home Health and HospiceHome health agency · Rolla, MO
- Alternative Hospice, LLCHospice · Fenton, MO
- Phelps Health Home Health and HospiceHospice · Rolla, MO
Industry payments (Open Payments)
- 2025$797.66 · 40 payments from 17 companies
- 2024$634.98 · 27 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Dexcom, Inc. | $154.67 | 7 |
| Novo Nordisk Inc | $85.49 | 4 |
| Lilly USA, LLC | $77.66 | 4 |
| Amgen Inc. | $59.85 | 3 |
| Pfizer Inc. | $47.43 | 3 |
What the 2025 payments were for
- Food and Beverage$797.66 · 40 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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