Dr. Reid F. Johnstone, MD
- Medicare services, 2024
- 11,082
- Medicare patients, 2024
- 455
- Part D claims, 2024
- 1,740
- Hospital affiliations
- 1
- Industry payments
- $16,070
- Practice address
- 212 Frontage Rd, Clemson, SC 29631
- Practice phone
- Call (864) 458-7431
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Allergy Partners of the Upstate
Clemson, South Carolina
Find Dr. Johnstone'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. Reid F. Johnstone is an allergist and immunologist in Clemson, South Carolina
Dr. Johnstone practices at Allergy Partners of the Upstate in Clemson, South Carolina.
Dr. Johnstone's NPI, 1013907260, was assigned on October 27, 2005. Dr. Johnstone graduated from University of South Carolina School of Medicine in 1997. Dr. Johnstone holds South Carolina license MD20199.
- NPI
- 1013907260NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0446358691
- NPI enumeration date
- October 27, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (864) 458-7431
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 55
- Medical school graduation
- 1997
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Reid F. Johnstone practices at Allergy Partners of the Upstate in Clemson, South Carolina
Dr. Johnstone's primary practice is Allergy Partners of the Upstate, at 212 Frontage Rd, Clemson, SC 29631 in Pickens County. The practice phone is (864) 458-7431.
- Allergy Partners of the Upstate212 Frontage Rd, Clemson, SC 29631 · Pickens CountyPhone(864) 458-7431
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Reid F. Johnstone is affiliated with 3 sites of care and 1 medical group
Dr. Johnstone's primary practice is Allergy Partners of the Upstate in Clemson, South Carolina. Dr. Johnstone is also affiliated with AnMed Medical Center. The medical group on file is Allergy Partners of Crestview Hills. Dmand AI also links Dr. Johnstone to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Reid F. Johnstone's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnstone practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Allergy Partners of the Upstate | 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. Reid F. Johnstone is one of 42 allergists and immunologists in South Carolina
Allergy and immunology is Dr. Johnstone's primary specialty in the NPI Registry, under taxonomy code 207K00000X. Dr. Johnstone is licensed in South Carolina.
Specialties and state licenses
- Allergy and immunology, South CarolinaPrimary
Allergists and immunologists near Dr. Johnstone
Counts of allergists and immunologists 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. Reid F. Johnstone billed Medicare for 11,082 services in 2024
CMS data shows 11,082 Medicare services from Dr. Johnstone across 15 procedure codes in 2024, for 455 Medicare patients. Medicare paid $187,197 for them. Every service was in an office.
Dr. Johnstone's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 8,0722024: 6,92614%
- Drugs given in the office
- 2023: 2,2502024: 3,72265%
- Office and hospital visits
- 2023: 4392024: 4341%
Dr. Johnstone compared with the South Carolina median for allergists and immunologists, 2024
- Dr. Johnstone
- South Carolina median
- Medicare services
- 11,082vs 5,4182.0 times
- Medicare patients
- 455vs 30549% above
- Part D claims
- 1,582vs 6302.5 times
Medians across 44 allergists and immunologists in South Carolina with Dmand AI profiles that report each measure.
Dr. Johnstone's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Johnstone and other allergists and immunologists in South Carolina.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Reid F. Johnstone treated 455 Medicare patients in 2024, average age 73
CMS counts 455 Medicare patients who saw Dr. Johnstone in 2024. The largest group is 65 to 74, with 263 patients. 75% of them have high cholesterol, and 67% have high blood pressure. Their average risk score is 0.81, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Johnstone's median patient age at 35, with 59% women.
Dr. Johnstone's Medicare patients by age, 2024
Dr. Johnstone's Medicare patients by sex, 2024
- Women30066%
- Men15534%
Chronic conditions among Dr. Johnstone's Medicare patients, 2024
- High cholesterol75%
- High blood pressure67%
- Arthritis49%
- Asthma33%
- Anxiety25%
- Mood disorders23%
- Ischemic heart disease22%
- Osteoporosis22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Johnstone's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 35
Patient panel by sex, all payers
- Women59%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Reid F. Johnstone wrote 1,740 Medicare Part D claims in 2024
In 2024, Dr. Johnstone wrote 1,740 Medicare Part D claims for 347 patients. 73% of them were for generic drugs. CMS names the drug for 1,582 of them, across 28 drugs with 11 or more claims each, at $1,440,223 in total drug cost. In 2023, CMS named 1,454 claims across 23 drugs.
Dr. Johnstone's Part D claims by kind of drug, 2024
- Generic1,271 claims73%
- Brand-name469 claims27%
Dr. Johnstone'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.
Drug classes CMS tracks in Dr. Johnstone's Part D claims, 2024
- Antibiotics2%36 of 1,740 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,4542024: 1,5829%
Drugs named by CMS: 28 in 2024, 23 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
How Dr. Reid F. Johnstone takes part in Medicare
Dr. Johnstone accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Reid F. Johnstone received $16,070 in industry payments from 2016 to 2025
CMS Open Payments shows 847 general payments to Dr. Johnstone from 41 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $2,813.
General payments to Dr. Johnstone by program year, 2016 to 2025
General payments to Dr. Johnstone by kind, 2016 to 2025
- Food and beverage$16,018100%
- Education$520%
Companies that paid Dr. Johnstone the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Reid F. Johnstone graduated from University of South Carolina School of Medicine
Dr. Johnstone graduated from University of South Carolina School of Medicine in 1997.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Reid F. Johnstone'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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. Reid F. Johnstone
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. Reid F. Johnstone's NPI number?
Dr. Reid F. Johnstone's NPI number is 1013907260. It was assigned on October 27, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Reid F. Johnstone?
Dr. Reid F. Johnstone is an allergist and immunologist in Clemson, South Carolina. The primary specialty in the NPI Registry is Allergy & Immunology Physician (taxonomy code 207K00000X).
Where does Dr. Reid F. Johnstone practice?
Dr. Johnstone practices at 212 Frontage Rd, Clemson, SC 29631. Dr. Johnstone's primary practice is Allergy Partners of the Upstate in Clemson, South Carolina. Dmand AI also links Dr. Johnstone to 1 group practice or clinic.
What is Dr. Reid F. Johnstone's office phone number?
The practice phone on file for Dr. Johnstone is (864) 458-7431.
What is Dr. Reid F. Johnstone's medical license number?
Dr. Johnstone holds South Carolina license MD20199.
Which hospitals is Dr. Reid F. Johnstone affiliated with?
Dr. Johnstone is affiliated with AnMed Medical Center.
What medical group is Dr. Reid F. Johnstone part of?
Dr. Johnstone is linked to Allergy Partners of Crestview Hills.
Does Dr. Reid F. Johnstone accept Medicare?
Yes. CMS data shows Dr. Johnstone billed Medicare for 11,082 services in 2024, and Dr. Johnstone accepts Medicare assignment.
How many Medicare patients does Dr. Reid F. Johnstone see?
CMS counts 455 Medicare patients who saw Dr. Johnstone in 2024, with an average age of 73.
What services does Dr. Reid F. Johnstone bill to Medicare?
In 2024, Dr. Johnstone's most billed Medicare services were injected or infused drug (J2357), allergy test or treatment (95004) and allergy test or treatment (95165).
Show 4 more questionsShow fewer questions
Where did Dr. Reid F. Johnstone go to medical school?
Dr. Johnstone graduated from University of South Carolina School of Medicine in 1997.
What drugs does Dr. Reid F. Johnstone prescribe most?
In 2024 Medicare Part D data, Dr. Johnstone's most prescribed drugs by claims were Ipratropium Bromide, Azelastine HCl and Montelukast Sodium.
Has Dr. Reid F. Johnstone received payments from drug or device companies?
CMS Open Payments shows $16,070 in general payments to Dr. Johnstone from 41 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Reid F. Johnstone been practicing?
Dr. Johnstone graduated from medical school in 1997, 29 years ago.
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