John Armstrong, DO
Internal Medicine Physician · Rolla, MO
John 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 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
- Entity
- Type 1 · individual
Also registered at 1050 W 10TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Paige Alvarado, CNMAdvanced Practice Midwife1316669781
- Mathew Ausmus, DDSPediatric Dentistry1518957778
- Steven Ballard, ANPAdult Health Nurse Practitioner1043454564
- James Bass, M.D.General Practice Physician1336130079
- Sara Bayless, PNPPediatric Nurse Practitioner1811642044
- Tabitha Beaty, NP-CFamily Nurse Practitioner1619815875
Verify John 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
38% 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 2,785 among the 127,794 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, mostly food and beverage; the largest payer was Corcept Therapeutics. The 65,274 providers of this specialty with any payment received $2,536.66 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.
One hospital or facility affiliation
- Pcrmc Medical Group IncRolla, MO
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
21 internal medicine physician records list a Rolla practice address
They are 21 of the 621 NPPES records with a Rolla practice address, and 3,392 internal medicine physician records in Missouri.
All 21 in Rolla → All 3,392 in Missouri → Every provider in Rolla →
Other internal medicine physician records in Missouri
- Betty Abban, M.D.Springfield, MO1063893162
- Amer Abbas, MDSaint Louis, MO1508480666
- Marghoob Abbas, M.D.St Joseph, MO1588603781
- Muhammad Khalid Abbas, M.D.Springfield, MO1447877089
- Sundas Abbas, MDRichmond Heights, MO1649790486
- Hajira Abbasi, DOSaint Louis, MO1194036947
- Mohammed Abbasi, MDSaint Louis, MO1497097083
- Catey Abbott, DOSaint Louis, MO1699355347
- David Abbott, MDRichmond Heights, MO1568448850
- Ramzi Abboud, MDSaint Louis, MO1649684200
Common questions
What is John Armstrong, DO's NPI number?
John 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 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 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 Armstrong, DO prescribe under Medicare Part D?
In 2024, John Armstrong, DO had 3,854 Medicare Part D claims for 462 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.