Ann Allergy Asthma Immunol
Angioedemas, HereditaryComplement C1 Inhibitor ProteinPyrazoles
Dr. Douglas Thomas Johnston, DO
NPI1124048079
- Medicare services, 2022
- 14
- Part D claims, 2023
- 11
- Publications
- 44
- Clinical trials
- 11
- Industry payments
- $702,523
- Practice address
- 200 Patewood Dr. Ste. A-16, Greenville, SC 29615
- Practice phone
- Call (864) 454-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Prisma Health Outpatient Mammography - Patewood
Mammography / Breast Imaging Center · Greenville, South Carolina
Find Dr. Johnston'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. Douglas Thomas Johnston is an allergist and immunologist in Greenville, South Carolina
Dr. Johnston practices at Prisma Health Outpatient Mammography - Patewood in Greenville, South Carolina.
Dr. Johnston's NPI, 1124048079, was assigned on July 20, 2006. Dr. Johnston graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 2001. Dr. Johnston holds South Carolina license 967.
NPI and contact details
- NPI
- 1124048079NPI Registry (opens in a new tab)
- NPI enumeration date
- July 20, 2006
- NPI status
- Active
- Practice phone
- (864) 454-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Douglas Thomas Johnston practices at Prisma Health Outpatient Mammography - Patewood in Greenville, South Carolina
Dr. Johnston's primary practice is Prisma Health Outpatient Mammography - Patewood, at 200 Patewood Dr. Ste. A-16, Greenville, SC 29615. The practice phone is (864) 454-1000.
- Prisma Health Outpatient Mammography - Patewood200 Patewood Dr. Ste. A-16, Greenville, SC 29615Phone(864) 454-1000
Source: Dmand AI Affiliation Data
Dr. Douglas Thomas Johnston is affiliated with 3 sites of care and 2 medical groups
Dr. Johnston's primary practice is Prisma Health Outpatient Mammography - Patewood in Greenville, South Carolina. The medical group on file is Prisma Health Medical Group. Dmand AI also links Dr. Johnston to 2 more group practices and clinics and 1 medical group, each named with a free account. Dr. Johnston's employer is on file too: a breast imaging center.
Prisma Health Outpatient Mammography - PatewoodPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Douglas Thomas Johnston's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnston practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Prisma Health Outpatient Mammography - Patewood | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Douglas Thomas Johnston is one of 42 allergists and immunologists in South Carolina
Allergy and immunology is Dr. Johnston's primary specialty in the NPI Registry, under taxonomy code 207K00000X. Dr. Johnston is board certified in 2004 - 2006 by the AL State License. Dmand AI has Dr. Johnston's licenses on file in 3 states: South Carolina, Alabama and North Carolina.
Specialties and state licenses
- Allergy and immunology, South CarolinaPrimary
- Alabama license
- North Carolina license
Allergists and immunologists near Dr. Johnston
Counts of allergists and immunologists with a Dmand AI profile, by place and practice. Each opens the list.
42allergists and immunologists in South Carolina
8allergists and immunologists in Greenville
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Douglas Thomas Johnston billed Medicare for 14 services in 2022
CMS data shows 14 Medicare services from Dr. Johnston across 1 procedure code in 2022, all of them office visits. Medicare paid $712 for them. Every service was in an office.
Medicare services, 202214
Paid by Medicare$712
Procedure codes1
Dr. Johnston's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 1092022: 1487%
- Tests and treatments
- 2021: 1,1172022: 0100%
Dr. Johnston compared with the South Carolina median for allergists and immunologists, 2022
- Dr. Johnston
- South Carolina median
- Medicare services
- 14vs 5,418100% below
- Part D claims
- 11vs 63098% below
Medians across 44 allergists and immunologists in South Carolina with Dmand AI profiles that report each measure.
Dr. Johnston's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Johnston?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Johnston 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. Douglas Thomas Johnston's patients have a median age of 26
Across all payers, Dmand AI patient panel data puts Dr. Johnston's median patient age at 26, with 52% women.
Dr. Johnston's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 26
Patient panel by sex, all payers
- Women52%
- Men48%
Source: Dmand AI Patient Panel Data
Dr. Douglas Thomas Johnston wrote 11 Medicare Part D claims in 2023
In 2023, Dr. Johnston wrote 11 Medicare Part D claims. They cover 1 drug, with $552,513 in total drug cost. In 2022, CMS named 173 claims across 7 drugs.
Part D claims, 202311
Drugs named by CMS1
Total drug cost$552,513
Dr. Johnston's most prescribed drugs by claims, 2023
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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 1732023: 1194%
Drugs named by CMS: 1 in 2023, 7 in 2022.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Douglas Thomas Johnston has 44 publications on record
Dmand AI links 44 papers to Dr. Johnston, published from 2006 to 2025. 2021 was the busiest year, with 7. The most frequent topics are Angioedemas, Hereditary, Complement C1 Inhibitor Protein and Double-Blind Method. Dr. Johnston has published most often in Ann Allergy Asthma Immunol. Dr. Johnston's most frequent co-authors are Marc Andrew Riedl, MD, Timothy J. Craig, DO and Aleena Banerji, MD.
Papers44
Years published2006 to 2025
Dr. Johnston's papers by year, 2006 to 2025
Topics Dr. Johnston writes about most
- Angioedemas, Hereditary
- Complement C1 Inhibitor Protein
- Double-Blind Method
- Hereditary Angioedema Types I and II
- Antibodies, Monoclonal, Humanized
- Bradykinin
- Eosinophilic Esophagitis
- Pyrazoles
Dr. Johnston's most frequent co-authors
- Marc Andrew Riedl, MD14 shared papers
- Timothy J. Craig, DO9 shared papers
- Aleena Banerji, MD8 shared papers
Recent publications by Dr. Johnston
J Allergy Clin Immunol Pract
Angioedemas, HereditaryComplement C1 Inhibitor ProteinDouble-Blind Method
Ann Allergy Asthma Immunol
Angioedemas, HereditaryHealth Status Disparities
Angioedemas, HereditaryAntibodies, Monoclonal, HumanizedComplement C1 Inhibitor Protein
See who Dr. Johnston researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Johnston works with, so you can find a warm path to the right allergists and immunologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Douglas Thomas Johnston has worked on 11 clinical trials
Dmand AI links Dr. Johnston to 11 clinical trials, 6 of them phase 3 studies. Conditions studied include Hereditary Complement Deficiency Diseases, Angioedemas, Hereditary and Eosinophilic Esophagitis. Shire sponsors the most, 8. Open Payments lists research payments to Dr. Johnston that name 1 trial.
Clinical trials with Dr. Johnston by phase
- NonePhase 1: no trials
- 1Phase 2: 1 trial
- 6Phase 3: 6 trials
- NonePhase 4: no trials
Conditions in Dr. Johnston's trials
- Hereditary Complement Deficiency Diseases
- Angioedemas, Hereditary
- Eosinophilic Esophagitis
- Esophagitis
- Peanut Hypersensitivity
Investigators on the most trials with Dr. Johnston
- Daniel Fletcher Soteres, MD4 shared trials
- Raffi Tachdjian, MD4 shared trials
- Satyaprasad Alapati, MD3 shared trials
Recent clinical trials with Dr. Johnston
Eosinophilic EsophagitisEsophagitisOral Budesonide Suspension (OBS)
Hereditary Complement Deficiency DiseasesAngioedemas, HereditaryLanadelumab 150 mgLanadelumab 300 mg
Hereditary Complement Deficiency DiseasesAngioedemas, HereditaryLanadelumab
Continuation Study With Budesonide Oral Suspension (BOS) for Adolescent and Adult Participants With Eosinophilic Esophagitis (EoE) (opens in a new tab)
TerminatedPhase 3
Eosinophilic EsophagitisEsophagitisBudesonide oral suspension
Efficacy, Safety, and Pharmacokinetics of APT-1011 in Subjects With Eosinophilic Esophagitis (EoE) (opens in a new tab)
CompletedPhase 2
Eosinophilic EsophagitisEsophagitisAPT-1011
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Douglas Thomas Johnston received $702,523 in industry payments from 2016 to 2023
CMS Open Payments shows 1,304 general payments to Dr. Johnston from 35 drug and device companies from 2016 to 2023. Speaker and faculty fees make up the largest share, 46% of the total. Shire North American Group Inc paid the most, $379,031. It also lists 1 research payment totaling $350 in 2017, naming 1 clinical trial.
General payments to Dr. Johnston by program year, 2016 to 2023
General payments to Dr. Johnston by kind, 2016 to 2023
$702.5Kin total
- Speaker and faculty fees$326,52346%
- Honoraria$138,96820%
- Consulting fees$129,07618%
- Travel and lodging$85,25112%
- Other$22,7073%
Companies that paid Dr. Johnston the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Douglas Thomas Johnston has 5 awards and honors on record
Dmand AI lists 5 awards for Dr. Johnston, most recently Clemens von Pirquet Award for best research in 2005.
Awards and honors for Dr. Johnston
- 2005
- Clemens von Pirquet Award for best research
- J. Claude Bennett Award for Excellence in Research by an Associate Fellow (Semi-finalist)
- 2004
- John F. Aloia Award
- 2002
- Letter of commendation
- Undated
- AAAAI Fellow
Source: Dmand AI Professional Profile Data
Dr. Douglas Thomas Johnston graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury
Dr. Johnston graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 2001. Dr. Johnston is a member of AAAAI.
- Medical school
- Board certified in 2004 - 2006
- Board certified in allergy & immunology
- Board certified in 2011 - 2026
- Board certified in 2006 - 2027
Source: Dmand AI Professional Profile Data
Dr. Douglas Thomas Johnston accepts plans from 13 insurance carriers
Dr. Johnston is in network with 13 carriers, including Elevance, Excellus BlueCross BlueShield and United Healthcare. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Elevance
- Excellus BlueCross BlueShield
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Cigna
- Molina
- Blue Cross Blue Shield of Massachusetts
- HCSC
- +5 more carriersWith a free account
Plan types Dr. Johnston accepts, by number of carriers
- PPO10
- Medicare8
- HMO6
- POS4
- Medicaid3
- EPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Douglas Thomas Johnston'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 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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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 |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Douglas Thomas Johnston
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. Douglas Thomas Johnston's NPI number?
Dr. Douglas Thomas Johnston's NPI number is 1124048079. It was assigned on July 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Douglas Thomas Johnston?
Dr. Douglas Thomas Johnston is an allergist and immunologist in Greenville, South Carolina. The primary specialty in the NPI Registry is Allergy & Immunology Physician (taxonomy code 207K00000X).
Where does Dr. Douglas Thomas Johnston practice?
Dr. Johnston practices at 200 Patewood Dr. Ste. A-16, Greenville, SC 29615. Dr. Johnston's primary practice is Prisma Health Outpatient Mammography - Patewood in Greenville, South Carolina. Dmand AI also links Dr. Johnston to 2 group practices and clinics and 1 medical group.
What is Dr. Douglas Thomas Johnston's office phone number?
The practice phone on file for Dr. Johnston is (864) 454-1000.
What is Dr. Douglas Thomas Johnston's medical license number?
Dr. Johnston holds South Carolina license 967, one of the licenses on file in 3 states.
Which states has Dr. Douglas Thomas Johnston been licensed in?
Dmand AI has state licenses on file for Dr. Johnston in South Carolina, Alabama and North Carolina.
What medical group is Dr. Douglas Thomas Johnston part of?
Dr. Johnston is linked to Prisma Health Medical Group. Dmand AI links Dr. Johnston to 1 more medical group.
Does Dr. Douglas Thomas Johnston accept Medicare?
Yes. CMS data shows Dr. Johnston billed Medicare for 14 services in 2022.
Is Dr. Douglas Thomas Johnston board certified?
Yes. Dr. Johnston is board certified in 2004 - 2006 by the AL State License.
What services does Dr. Douglas Thomas Johnston bill to Medicare?
In 2022, Dr. Johnston's most billed Medicare services were office visit, established patient (99214).
Show 7 more questionsShow fewer questions
Where did Dr. Douglas Thomas Johnston go to medical school?
Dr. Johnston graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 2001.
What drugs does Dr. Douglas Thomas Johnston prescribe most?
In 2023 Medicare Part D data, Dr. Johnston's most prescribed drugs by claims were Takhzyro.
Has Dr. Douglas Thomas Johnston received payments from drug or device companies?
CMS Open Payments shows $702,523 in general payments to Dr. Johnston from 35 companies from 2016 to 2023. The largest total came from Shire North American Group Inc.
How long has Dr. Douglas Thomas Johnston been practicing?
Dr. Johnston graduated from medical school in 2001, 25 years ago.
Does Dr. Douglas Thomas Johnston do research?
Dmand AI links 44 publications to Dr. Johnston, published from 2006 to 2025. Dr. Johnston has worked on 11 clinical trials.
Who does Dr. Douglas Thomas Johnston publish with?
Dr. Johnston's most frequent co-authors are Marc Andrew Riedl, MD (14 shared papers), Timothy J. Craig, DO (9 shared papers) and Aleena Banerji, MD (8 shared papers).
What insurance does Dr. Douglas Thomas Johnston accept?
Dr. Johnston is in network with 13 carriers, including Elevance, Excellus BlueCross BlueShield and United Healthcare. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
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