Gregory Thomas Armstrong, RPH
Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist · John Day, OR
Gregory Thomas Armstrong, RPH is a pharmacist clinician (phc)/ clinical pharmacy specialist with a practice address in John Day, Oregon, and NPI 1811321078, issued on Aug 23, 2013. Check the license (Oregon RPH-0007339, as entered in NPPES) with the Oregon board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory Thomas Armstrong
- Credential
- RPH
- Primary taxonomy
- Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist 1835P0018X
- License numbers
- RPH-0007339 OR
7339 OR
Self-reported in NPPES; status is on the state search - Practice location
- 120 E Main St, John Day, OR 97845
- Phone
- (541) 575-0629
- Enumerated
- Aug 23, 2013
- Record last updated
- Sep 8, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (541) 575-2342
- Entity
- Type 1 · individual
8 nearest pharmacist clinician (phc)/ clinical pharmacy specialist records → All 985 in Oregon → Look up another NPI →
Also registered at 120 E Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tilli Slusarenko, PHARMDPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1922416957
Verify Gregory Thomas Armstrong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Oregon board licenses this profession
Search for license RPH-0007339Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 100% of the cost of the top drugs
48 Medicare Part D claims for 39 beneficiaries, against an average of 253 among the 1,614 providers of this specialty who prescribed in Part D. Brand-name drugs were 100% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Shingrix22 claims
- Arexvy16 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.
Gregory Thomas Armstrong among 985 pharmacist clinician (phc)/ clinical pharmacy specialist records in Oregon
Gregory Thomas Armstrong, RPH is one of 985 pharmacist clinician (phc)/ clinical pharmacy specialist records with a practice address in Oregon. 27% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 37% of them.
- NPI issued2013 · 37% of these records are older, 57% newer
- In a Medicare fileYes · 27% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2021 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1835P0018X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 pharmacist clinician (phc)/ clinical pharmacy specialist records list a practice address in John Day
They are 2 of the 97 NPPES records with a practice address in John Day, and 985 pharmacist clinician (phc)/ clinical pharmacy specialist records in Oregon.
All 985 in Oregon → Every provider in John Day → Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist nationwide →
The 8 pharmacist clinician (phc)/ clinical pharmacy specialist records with the nearest ZIP codes
- Tilli Slusarenko, PHARMDJohn Day, OR 978451922416957
- Mayra Barrera, PHARMDHermiston, OR 978381083201693
- Christopher EdenHermiston, OR 978381033545496
- Alicia RomeroHermiston, OR 978381912449620
- Michael Farley, RPHEnterprise, OR 978281245517465
- Tom Potts, PHARM.D,Milton Freewater, OR 978621225338833
- Janet Plumley, RPHBaker City, OR 978141154621464
- Kelly Drollinger, PHARMDOntario, OR 979141033455688
Common questions
What is Gregory Thomas Armstrong, RPH's NPI number?
Gregory Thomas Armstrong, RPH's National Provider Identifier (NPI) is 1811321078, issued on Aug 23, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Thomas Armstrong, RPH located?
The NPPES record lists a practice address at 120 E Main St, John Day, OR, 97845. Phone: (541) 575-0629. Providers update this record themselves, so call before visiting.
How can I verify Gregory Thomas Armstrong, RPH's license?
NPPES lists Oregon license number RPH-0007339, as entered by the provider. Search the Oregon board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory Thomas Armstrong, RPH prescribe under Medicare Part D?
In 2024, Gregory Thomas Armstrong, RPH had 48 Medicare Part D claims for 39 beneficiaries; the average among pharmacist clinician (phc)/ clinical pharmacy specialist prescribers was 253. 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.