Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John Ashton Armstrong, DO

Individual provider Internal Medicine Physician · NPI 1427679232

John Ashton Armstrong, DO practises Internal Medicine in Rolla, Missouri. Graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2020, 6 years ago. Practices with Pcrmc Medical Group Inc, a 114-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
6
Trained at
At Still University of Health Sciences, College of Osteo Med, Kirksville
Licensed in
MO
In the registry since
2020
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1050 W 10th St
Rolla, MO 65401-2905
Phone: (573) 364-9000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 1000 W 10th St, Rolla, MO 65401-2905 — (573) 364-9000
  • 817 Oak Knoll Rd, Rolla, MO 65401-4715 — (573) 466-0228
  • 1000 Gw Ln, Waynesville, MO 65583-2339 — (573) 774-2715

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 2023028809 (MO)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1427679232
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 3, 2020
Last updated in NPPESFebruary 27, 2024
Certification dateFebruary 27, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolAT STILL UNIVERSITY OF HEALTH SCIENCES, COLLEGE OF OSTEO MED, KIRKSVILLE
Graduated 2020 (6 years in practice)
Group practice Pcrmc Medical Group Inc — 114 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients266
Services billed 718 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $798 40 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Pcrmc Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 114 clinicians in the practice; 12 are shown here.

Other providers in Rolla