Dr. Mason Garrett Harper, MD
- Medicare patients, 2024
- 19
- Part D claims, 2024
- 473
- Publications
- 2
- Hospital affiliations
- 2
- Industry payments
- $64
- Practice address
- 2600 St Michael Dr, Texarkana, TX 75503
- Practice phone
- Call (903) 614-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Harper's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mason Garrett Harper is an internist in Texarkana, Texas
Dr. Harper practices at CHRISTUS St. Michael Hospital in Texarkana, Texas, part of CHRISTUS Health.
Dr. Harper's NPI, 1447839170, was assigned on April 8, 2021. Dr. Harper holds Arkansas license E-17188.
- NPI
- 1447839170NPI Registry (opens in a new tab)
- NPI enumeration date
- April 8, 2021
- NPI status
- Active
- Practice phone
- (903) 614-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 31
- Medical school graduation
- 2021
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Mason Garrett Harper practices at CHRISTUS St. Michael Hospital in Texarkana, Texas
Dr. Harper's primary practice is CHRISTUS St. Michael Hospital, at 2600 St Michael Dr, Texarkana, TX 75503 in Bowie County. The practice phone is (903) 614-1000.
- CHRISTUS St. Michael Hospital2600 St Michael Dr, Texarkana, TX 75503 · Bowie CountyPhone(903) 614-1000
Source: Dmand AI Affiliation Data
Dr. Mason Garrett Harper is affiliated with 3 sites of care and 1 medical group
Dr. Harper's primary practice is CHRISTUS St. Michael Hospital in Texarkana, Texas, part of CHRISTUS Health. The medical group on file is UAMS - University of Arkansas for Medical Sciences. Dmand AI also links Dr. Harper to 1 more hospital and 1 clinical lab, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mason Garrett Harper's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Harper practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| CHRISTUS St. Michael Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mason Garrett Harper is one of 8,437 internists in Texas
Internal medicine is Dr. Harper's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Harper is licensed in Arkansas.
Specialties and state licenses
- Internal medicine, ArkansasPrimary
Internists near Dr. Harper
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mason Garrett Harper treated 19 Medicare patients in 2024, average age 65
CMS counts 19 Medicare patients who saw Dr. Harper in 2024. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 2.37, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Harper's median patient age at 62, with 33% women.
Chronic conditions among Dr. Harper's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
Share of Medicare patients with each condition. A patient can have several.
Dr. Harper's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women33%
- Men67%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mason Garrett Harper wrote 473 Medicare Part D claims in 2024
In 2024, Dr. Harper wrote 473 Medicare Part D claims for 80 patients. 88% of them were for generic drugs. CMS names the drug for 238 of them, across 13 drugs with 11 or more claims each, at $1,996 in total drug cost. In 2023, CMS named 295 claims across 15 drugs.
Dr. Harper's Part D claims by kind of drug, 2024
- Generic415 claims88%
- Brand-name and other58 claims12%
Dr. Harper's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2952024: 23819%
Drugs named by CMS: 13 in 2024, 15 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Mason Garrett Harper has 2 publications on record
Dmand AI links 2 papers to Dr. Harper, published from 2022 to 2023.
Recent publications by Dr. Harper
Theranostics
See who Dr. Harper researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Harper works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mason Garrett Harper received $64 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Harper from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Medline Industries, Inc. paid the most, $64.
Companies that paid Dr. Harper the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mason Garrett Harper's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mason Garrett Harper
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mason Garrett Harper's NPI number?
Dr. Mason Garrett Harper's NPI number is 1447839170. It was assigned on April 8, 2021, and it is active in the NPI Registry.
What kind of doctor is Dr. Mason Garrett Harper?
Dr. Mason Garrett Harper is an internist in Texarkana, Texas. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mason Garrett Harper practice?
Dr. Harper practices at 2600 St Michael Dr, Texarkana, TX 75503. Dr. Harper's primary practice is CHRISTUS St. Michael Hospital in Texarkana, Texas, part of CHRISTUS Health. Dmand AI also links Dr. Harper to 1 hospital and 1 clinical lab.
What is Dr. Mason Garrett Harper's office phone number?
The practice phone on file for Dr. Harper is (903) 614-1000.
What is Dr. Mason Garrett Harper's medical license number?
Dr. Harper holds Arkansas license E-17188.
Which hospitals is Dr. Mason Garrett Harper affiliated with?
Dr. Harper practices at CHRISTUS St. Michael Hospital in Texarkana, Texas. Dmand AI links Dr. Harper to 1 more hospital.
What medical group is Dr. Mason Garrett Harper part of?
Dr. Harper is linked to UAMS - University of Arkansas for Medical Sciences.
How many Medicare patients does Dr. Mason Garrett Harper see?
CMS counts 19 Medicare patients who saw Dr. Harper in 2024, with an average age of 65.
What drugs does Dr. Mason Garrett Harper prescribe most?
In 2024 Medicare Part D data, Dr. Harper's most prescribed drugs by claims were Atorvastatin Calcium, Allopurinol and Metoprolol Succinate.
Has Dr. Mason Garrett Harper received payments from drug or device companies?
CMS Open Payments shows $64 in general payments to Dr. Harper from 1 company from 2025 to 2025. The largest total came from Medline Industries, Inc.
How long has Dr. Mason Garrett Harper been practicing?
Dr. Harper graduated from medical school in 2021, 5 years ago.
Does Dr. Mason Garrett Harper do research?
Dmand AI links 2 publications to Dr. Harper, published from 2022 to 2023.
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