Mason Garrett Harper, MD
Internal Medicine Physician · Little Rock, AR
Mason Garrett Harper, MD is an internal medicine physician with a practice address in Little Rock, Arkansas, and NPI 1447839170, issued on Apr 8, 2021. Check the license (Arkansas E-17188, as entered in NPPES) on the Arkansas State Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mason Garrett Harper
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- E-17188 AR
Self-reported in NPPES; status is on the state search - Practice location
- 4301 W Markham St # 641, Little Rock, AR 72205
- Phone
- (501) 686-8000
- Enumerated
- Apr 8, 2021
- Record last updated
- Jul 8, 2024
- Fax
- (501) 526-5148
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 768 in Arkansas → Look up another NPI →
Also registered at 4301 W Markham St # 641
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Morgan Horn, M.D.Internal Medicine Physician1730541798
Verify Mason Garrett Harper in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArkansas State Medical Board
Search for license E-17188Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average internal medicine physician in 2024
473 Medicare Part D claims for 80 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium49 claims
- Allopurinol25 claims
- Metoprolol Succinate25 claims
- Losartan Potassium19 claims
- Amlodipine Besylate18 claims
- Lisinopril17 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.
Mason Garrett Harper among 768 internal medicine physician records in Arkansas
Mason Garrett Harper, MD is one of 768 internal medicine physician records with a practice address in Arkansas. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 84% of them.
- NPI issued2021 · 84% of these records are older, 9% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2024 · 50% 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 Arkansas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
219 internal medicine physician records list a practice address in Little Rock
They are 219 of the 13,172 NPPES records with a practice address in Little Rock, and 768 internal medicine physician records in Arkansas.
All 768 in Arkansas → Every provider in Little Rock → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Brian Bean, M.D.Little Rock, AR 722051003870049
- Eric Delgiacco, M.D.Little Rock, AR 722051285695973
- Raymond Edwards, M.D.Little Rock, AR 722051851371314
- Irol Gray, MDLittle Rock, AR 722051164429981
- Richard Johns, MDLittle Rock, AR 722051144214578
- Rana Kayali, M.D.Little Rock, AR 722051720041577
- Lubna Maruf, M.D.Little Rock, AR 722051336119536
- Solomon Mogbo, M.DLittle Rock, AR 722051083615348
Common questions
What is Mason Garrett Harper, MD's NPI number?
Mason Garrett Harper, MD's National Provider Identifier (NPI) is 1447839170, issued on Apr 8, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Mason Garrett Harper, MD located?
The NPPES record lists a practice address at 4301 W Markham St # 641, Little Rock, AR, 72205. Phone: (501) 686-8000. Providers update this record themselves, so call before visiting.
How can I verify Mason Garrett Harper, MD's license?
NPPES lists Arkansas license number E-17188, as entered by the provider. Search the Arkansas State Medical Board at https://armedicalboard.adh.arkansas.gov/public/verify/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mason Garrett Harper, MD prescribe under Medicare Part D?
In 2024, Mason Garrett Harper, MD had 473 Medicare Part D claims for 80 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.