Dr. Reid Johnstone, MD

Allergy & ImmunologyMaleAge 50

Dr. Reid Johnstone, MD is a Allergy & Immunology Specialist in Clemson, SC. Dr. Johnstone has more experience with Food & Drug Allergies than other specialists in his area. He is affiliated with medical facilities Prisma Health Greenville Memorial Hospital and St. Francis Downtown. He is accepting new patients and has indicated that he accepts telehealth appointments. Be sure to call ahead with Dr. Johnstone to book an appointment.

Dr. Johnstone

Allergy Partners Of The Upstate

212 Frontage Rd Clemson, SC 29631
Accepting new patients
Telehealth services available

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Dr. Johnstone's Reviews

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Absolutely amazing. It is super rare to find a physician that truly cares. I would recommend him to anyone.
What went well
  • Appointment scheduling
  • Office environment
  • Staff friendliness
  • Appointment wasn't rushed
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
Anonymous – Jun 22, 2020
My one office visit for a severe rash and itching condition was a Complete Waste of my time. I never had a doctor say "I'm Stumped" about a condition. He commented about having a several hundred national network of doctors he could consult to find a cause. Told me he would call me back, Never Did! I had to call back several times with no response or answer. He seemed to have no experience or qualifications in this medical field, only confusion and lack of professional courtesy to respond back.
What went well
  • Staff friendliness
What could be improved
  • Difficult to schedule appointment
  • Long wait times
  • Appointment was rushed
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Didn't trust the provider's decisions
1 person found this helpful
SAM in Clemson, SC – Feb 07, 2019

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About Me


Dr. Johnstone is a native of South Carolina and Greenville.

"I come from a large family who suffered greatly with allergies growing up. Having...
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  • Allergy & Immunology
  • Internal Medicine

Board Certifications


McG Health Inc
Fellowship Hospital
Greenville Memorial Hospital
Residency Hospital
Greenville Memorial Hospital
Internship Hospital
College of Charleston
Undergraduate School


Frequently Asked Questions

What other Allergy & Immunology Specialists practice nearby?

Click here to compare with other Allergy & Immunology Specialists.

Does Dr. Reid Johnstone, MD offer telehealth services?

Dr. Johnstone has indicated that they offer telehealth. Contact the office to check for eligibility for your needs.

What are Dr. Reid Johnstone, MD's top areas of care?

Dr. Johnstone frequently treats Food & Drug Allergies. See all practice areas where Dr. Johnstone specializes.

Where is Dr. Reid Johnstone, MD's office located?

Dr. Johnstone's office is located at 212 Frontage Rd, Clemson, SC 29631. Find other locations and directions on Healthgrades.

How can I make an appointment with Dr. Reid Johnstone, MD?

Find contact information here to make an appointment.

Experience and Background Checks


Background Check

Healthgrades does not collect malpractice claims information for South Carolina
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
Learn more about background checks

Frequently Treated by Dr. Johnstone

Based on treatment records, we have identified the following as areas of care that Dr. Johnstone treats more often than their peers. If you are unsure whether Dr. Johnstone treats other conditions, please contact the office at (864) 654-0066.

Food & Drug Allergies

Food and drug allergy specialists diagnose and treat patients for whom certain foods or medications trigger an immune system response that causes distressing or life-threatening symptoms.Compare with other Food & Drug Allergies specialists.

Dr. Johnstone is experienced in the area of Food & Drug Allergies. See the graph below to learn more about his experience.

Based on claims data for 16 conditions and procedures

Dr. Johnstone
Similar Providers
Dermatitis Due to Substances Taken Internally
Food Allergy
Anaphylactic Food Allergies
Very High

Check Dr. Johnstone's experience treating your condition or procedure

Dr. Johnstone's conditions and procedures:

  • Abdominal Pain
  • Acne
  • Acute Bronchitis
  • Acute Pharyngitis
  • Acute Sinusitis
  • Acute Upper Respiratory Infection
  • All Headaches (incl. Migraine)
  • Allergic Conjunctivitis
  • Allergic Reaction
  • Allergic Rhinitis
  • Allergic Rhinitis Due to Food
  • Allergic Rhinitis Due to Pollen
  • Allergy Shots
  • Allergy Shots for Insect Stings
  • Allergy Skin Testing
  • Allergy Testing
  • Allergy Treatment
  • Anaphylactic Egg Allergy
  • Anaphylactic Fish Allergy
  • Anaphylactic Food Allergies
  • Anaphylactic Fruit and Vegetable Allergy
  • Anaphylactic Milk and Dairy Allergy
  • Anaphylactic Peanut Allergy
  • Anaphylactic Shell Fish Allergy
  • Anaphylactic Tree Nut Allergy
  • Anaphylaxis
  • Angioedema
  • Animal Allergies
  • Anosmia
  • Anxiety
  • Arthritis
  • Arthritis of the Elbow
  • Asthma
  • Atopic Dermatitis (Eczema)
  • Blepharitis
  • Blood Allergy Testing
  • Boil
  • Breath Testing
  • Breathing Disorders
  • Bronchiectasis
  • Bronchitis
  • Canker Sore
  • Celiac Disease
  • Chest Pain
  • Chronic Sinusitis
  • Common Variable Immune Deficiency (CVID)
  • Constipation
  • Contact Dermatitis
  • COPD (Chronic Obstructive Pulmonary Disease)
  • Cough
  • Dermatitis
  • Dermatitis Due to Food
  • Dermatitis Due to Substances Taken Internally
  • Desensitization
  • Diabetes Counseling
  • Diabetes Type 2
  • Diabetes With Renal Manifestations
  • Diarrhea
  • Dizziness
  • Drug Allergy Testing
  • Drug or Food Challenge
  • Dry Skin
  • Dyslipidemia
  • Dysphagia
  • Ear Ache
  • Earwax Buildup
  • Eczema and Contact Dermatitis Due to Cosmetics
  • Eosinophilic Esophagitis
  • Esophagitis
  • Fever
  • Fibromyalgia
  • Food Allergy
  • Food Poisoning
  • Food Sensitivity Testing
  • Gas-Bloat Syndrome
  • Gastritis
  • Gastroesophageal Reflux Disease (GERD)
  • Headache
  • Heart Disease
  • Hives
  • Hyperlipidemia
  • Hypertension
  • Hypogammaglobulinemia
  • Hypothyroidism
  • IgA Deficiency
  • IgM Deficiency
  • Immunodeficiency Syndromes
  • Insect Sting Allergies
  • Irritable Bowel Syndrome
  • Itchy Skin
  • Lactose Intolerance
  • Latex Allergy
  • Limb Pain
  • Limb Swelling Caused by Fluid Overload
  • Lipid Disorders
  • Malaise and Fatigue
  • Nasopharyngitis
  • Nausea
  • Nosebleed
  • Obesity
  • Osteoarthritis
  • Osteoarthritis of Ankle and Foot
  • Osteoarthritis of Shoulder
  • Otitis Media
  • Overweight
  • Patch Testing
  • Peptic Ulcer
  • Pharyngitis
  • Pinkeye (Conjunctivitis)
  • Pneumonia
  • Pollen Allergy
  • Postnasal Drip
  • Pulmonary Disease
  • Pulmonary Function Test
  • Radioallergosorbent Test
  • Rash
  • Reflux Esophagitis
  • Respiratory Diseases
  • Ringworm
  • Rosacea
  • Scabies
  • Shortness of Breath
  • Sinusitis
  • Skin Infections
  • Skin Testing and Screening
  • Sleep Apnea
  • Tinea Versicolor
  • Tinnitus
  • Tobacco Use Disorder
  • Toxic Effect of Venom
  • Vertigo
  • Vitamin D Deficiency
  • Wheezing

Insurance Check

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Dr. Johnstone accepts

Accepted insurance can change. Please double-check when making an appointment.

(864) 654-0066

Dr. Johnstone accepts the following insurance:

Aetna HMO
Choice Plus POS II
Superior Health Plan
National (BlueCard) PPO
Blue Cross Blue Shield
Blue Card PPO
CareFirst Blue Cross Blue Shield
HealthyBlue 2.0
HealthyBlue Advantage
Cigna HMO
Cigna PPO
Open Access Plus
First Health (Coventry Health Care)
First Health (Coventry Health Care) PPO
Choice Care PPO
MultiPlan PPO
PHCS Network PPO
United Healthcare


Allergy Partners Of The Upstate

Allergy Partners Of The Upstate212 Frontage Rd Clemson, SC 29631
Allergy Partners Of The Upstate48 Creekview Ct Greenville, SC 29615
Allergy Partners Of The Upstate62 Bear Dr Greenville, SC 29605

Allergy Partners Of The Upstate

Allergy Partners Of The Upstate115 Edgebrook Dr Anderson, SC 29621

Affiliated Hospitals

Dr. Johnstone is affiliated with the following hospitals. Select a hospital below to learn more.

Learn more about how Healthgrades measuresHospital Quality.

Prisma Health Greenville Memorial Hospital

Greenville, SC

69% Patient Experience Rating, Equal to the national average

4 Awards Received

St. Francis Downtown

Greenville, SC

80% Patient Experience Rating, 11% higher than the national average

40 Awards Received

Award Highlight: Outstanding Patient Experience Award™ (2021)

Compare Dr. Reid Johnstone, MD with other Allergy & Immunology Specialists near you