John Ashton Armstrong, DO
Internal Medicine Physician · Rolla, MO
John Ashton Armstrong, DO is an internal medicine physician with a practice address in Rolla, Missouri, and NPI 1427679232, issued on May 3, 2020. Check the license (Missouri 2023028809, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- John Ashton Armstrong
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2023028809 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1050 W 10TH St, Rolla, MO 65401
- Phone
- (573) 364-9000
- Enumerated
- May 3, 2020
- Record last updated
- Feb 27, 2024
- Medicare enrollment
- Enrolled (PECOS I20230814001105); accepts Medicare assignment
- Medical or professional school
- At Still University Of Health Sciences, College Of Osteo Med, Kirksville, 2020
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Also registered at 1050 W 10TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sara Bayless, PNPPediatric Nurse Practitioner1811642044
- Tabitha Beaty, NP-CFamily Nurse Practitioner1619815875
Verify John Ashton Armstrong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2023028809Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% more Medicare Part D claims than the average internal medicine physician in 2024
3,854 Medicare Part D claims for 462 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 330 claims were for opioids.
Most prescribed
- Atorvastatin Calcium167 claims
- Hydrocodone-Acetaminophen146 claims
- Pantoprazole Sodium132 claims
- Levothyroxine Sodium127 claims
- Losartan Potassium124 claims
- Gabapentin84 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: $634.98
27 payments; by number, the most common kind was food and beverage; the largest payer was Corcept Therapeutics. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Pcrmc Medical Group IncRolla, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Ashton Armstrong among 2,604 internal medicine physician records in Missouri
John Ashton Armstrong, DO is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 75% of them.
- NPI issued2020 · 75% of these records are older, 21% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2020 · median 2006 among the 1,443 with a school on file
- Record last updated2024 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
13 internal medicine physician records list a practice address in Rolla
They are 13 of the 621 NPPES records with a practice address in Rolla, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in Rolla → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Julian AtegekaRolla, MO 654011891427852
- Mahmoud Ballout, MDRolla, MO 654011891427472
- Jonathan Beers, DORolla, MO 654011477783686
- John Carr, MDRolla, MO 654011154816858
- Sellas Coble, D.O.Rolla, MO 654011629097035
- William Cottingham, DORolla, MO 654011255486205
- Tasnim FatimaRolla, MO 654011205585379
- Donald James, DORolla, MO 654011013100866
Common questions
What is John Ashton Armstrong, DO's NPI number?
John Ashton Armstrong, DO's National Provider Identifier (NPI) is 1427679232, issued on May 3, 2020. An NPI identifies a provider in billing; it is not a license.
Where is John Ashton Armstrong, DO located?
The NPPES record lists a practice address at 1050 W 10TH St, Rolla, MO, 65401. Phone: (573) 364-9000. Providers update this record themselves, so call before visiting.
How can I verify John Ashton Armstrong, DO's license?
NPPES lists Missouri license number 2023028809, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Ashton Armstrong, DO prescribe under Medicare Part D?
In 2024, John Ashton Armstrong, DO had 3,854 Medicare Part D claims for 462 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.