Casey Aaron Armstrong, M.D.
Hospitalist Physician · Salt Lake City, UT
Casey Aaron Armstrong, M.D. is a hospitalist physician with a practice address in Salt Lake City, Utah, and NPI 1972815421, issued on Jul 12, 2010. Check the license (Utah 8583743-1205, as entered in NPPES) on the Utah Medical Licensing Board; the Medicare figures below come from public CMS files.
- Name
- Casey Aaron Armstrong
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License numbers
- 8583743-1205 UT
11015721A IN
Self-reported in NPPES; status is on the state search - Practice location
- 5121 S Cottonwood St, Salt Lake City, UT 84107
- Phone
- (801) 408-6220
- Enumerated
- Jul 12, 2010
- Record last updated
- Apr 9, 2026
- Medicare enrollment
- Enrolled (PECOS I20130430000178); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2010
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 285 in Utah → Look up another NPI →
Also registered at 5121 S Cottonwood St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Casey Aaron Armstrong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersUtah Medical Licensing Board
Search for license 8583743-1205Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average hospitalist physician in 2024
11 Medicare Part D claims, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through one group practice
- Ihc Health Services IncRiverton, UT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Casey Aaron Armstrong among 285 hospitalist physician records in Utah
Casey Aaron Armstrong, M.D. is one of 285 hospitalist physician records with a practice address in Utah. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 40% of them.
- NPI issued2010 · 40% of these records are older, 56% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 79% of these records are
- Graduated2010 · median 2012 among the 225 with a school on file
- Record last updated2026 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Utah practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Utah
There are 285 hospitalist physician records in Utah.
All 285 in Utah → Every provider in Salt Lake City → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Shawn Bagci, M.D.Murray, UT 841071639338288
- Masarret Fazili, MDMurray, UT 841071417918145
- Michael Foster, M.D.Murray, UT 841071528379831
- David Green, M.D.Murray, UT 841071588795553
- Nancy Gundersen, M.D.Murray, UT 841071609080720
- Tricia Hauschild, M.D.Salt Lake City, UT 841071437477692
- Katalin Krivian, MDMurray, UT 841071285649954
- Monique Mahlum, M.D.Murray, UT 841071255564373
Common questions
What is Casey Aaron Armstrong, M.D.'s NPI number?
Casey Aaron Armstrong, M.D.'s National Provider Identifier (NPI) is 1972815421, issued on Jul 12, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Casey Aaron Armstrong, M.D. located?
The NPPES record lists a practice address at 5121 S Cottonwood St, Salt Lake City, UT, 84107. Phone: (801) 408-6220. Providers update this record themselves, so call before visiting.
How can I verify Casey Aaron Armstrong, M.D.'s license?
NPPES lists Utah license number 8583743-1205, as entered by the provider. Search the Utah Medical Licensing Board at https://secure.utah.gov/llv/search/index.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Casey Aaron Armstrong, M.D. prescribe under Medicare Part D?
In 2024, Casey Aaron Armstrong, M.D. had 11 Medicare Part D claims; the average among hospitalist physician prescribers was 521. 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.