Dr. Gregory Marcotte, MD

Locations

Dr. Gregory Marcotte began his private practice of Allergy and Immunology in Wilmington, Delaware in 1997, taking care of patients and their families with all types of allergic diseases.

Dr. Marcotte started college at Cornell University planning to go to veterinary school. After a trip to the emergency room for an allergy attack while working on a dairy farm his freshman summer, he changed majors to Cell Biology. He graduated with Distinction and Honors, and planned for medical school. He spent a year working as a laboratory technician at the Johns Hopkins University Division of Allergy and Immunology. He attended medical school at New York University, did his residency at the University of Colorado/National Jewish Hospital, and then returned to Johns Hopkins to complete his Allergy and Immunology Fellowship. He is board-certified in Adult and Pediatric Allergy and Immunology.

Dr. Marcotte has written several peer reviewed papers, given countless talks to fellow physicians and is involved in training the residents at both the Christiana Care and the St. Francis residency programs. He is currently the Section Chief for the Division of Allergy & Immunology at Christiana Care Health Services System and is past President and member of the Delaware Allergy Society. He is a Fellow of both the American Academy of Asthma, Allergy and Immunology; and the American College of Asthma, Allergy and Immunology and member of the Pennsylvania Allergy and Asthma Association, the American College of Physicians and the American Medical Association.

Dr. Marcotte volunteers time for the American Lung Association of Delaware (serves as medical director for the annual Asthma Camp) and the Food Allergy and Anaphylaxis Network branch in Delaware. He has received multiple awards in Delaware including being voted by his physician peers as one of the Best Allergists in Delaware annually and “Top Doc” of all doctors in all of Delaware in 2009.

Dr. Marcotte is married and has 2 daughters.

Dr. Marcotte’s office staff strives to deliver the best care to patients in a friendly and efficient manner and the office is accepting new patients of all ages.

Board Certified Allergist and Immunologist

#1 phsyician practice in delaware 2025 top doctors

Testimonials

rater8 Verified Patient

Mar-2025

He is very good, he takes the time to explain things in terms that are easy for the novice to understand

Patient Submitted Review

Mar-2025

I've been a patient of Dr. Marcotte for years. He's patient, knowledgeable, and addresses each of my issues and concerns. I highly recommend him!

Patient Submitted Review

Mar-2025

During my first visit with Dr. Marcotte today, he was very thorough. He listened to me, was very patient and throughly examined me as well as my medical history. He was professional, respectful and I appreciate his expertise and customer service.

rater8 Verified Patient

Mar-2025

Everyone was really kind and helpful. Nurses and Doctors were concerned about my health and explained everything and reviewed my concerns and gave me options for my care going forward

Patient Submitted Review

Mar-2025

I've been going to Dr Marcotte and staff for several years. very competent ; staff is very helpful and pleasant.

Patient Submitted Review

Feb-2025

Dr. Marcotte was very knowledgeable and took the time to answer all my questions and present a clear path forward for my circumstances.

Patient Submitted Review

Feb-2025

Dr. Marcotte is always very thorough, very personable, and has been extremely helpful in managing my asthma and allergy symptoms! The office staff are always friendly and helpful.

rater8 Verified Patient

Feb-2025

Dr. Marcotte is personable and took time to listen and ask follow-up questions. I like that follow up appointments can be done via telemed since I live 90 miles from the office.

Patient Submitted Review

Feb-2025

The team was quick, efficient and friendly without being rushed. I shared my history with Dr. Mascotte and he asked a lot of follow up questions to really understand what my concerns were. He did an assessment, helped educate me on my options and gave me a deeper understanding of my allergies. I left feeling amazingly well and reassured. Best of all, I felt like he was honest and didn't recommend any additional treatments/procedures that were not necessary for me.

rater8 Verified Patient

Feb-2025

Very compassionate and understanding. Hoping to find a pharmacy to make the compound for my daughter to get relief.

Patient Submitted Review

Feb-2025

An Incredibly warm, knowledgeable, and thorough doctor. I am extremely thankful that we could be seen by the doctor because you can tell he really cares to help, listens and is considerate and understanding. The office staff were all very kind and the entire experience was easy and helpful.

Patient Submitted Review

Jan-2025

Dr. Marcotte is very thorough and conducted a yearly examination hitting all the important issues. He also gave me some good recommendations for other medical specialists and vaccinations. He has helped me tremendously and I greatly respect him.

Patient Submitted Review

Jan-2025

I have been seeing Dr. Marcotte for years now. So caring, he listens to my concerns and always very helpful.

rater8 Verified Patient

Jan-2025

Terrific doctor and such a sweet man! Everyone including all the staff like him and seem to get along.

Patient Submitted Review

Jan-2025

Dr Marcotte is a true professional, extremely knowledgeable, patient, and kind. He listens well, and takes the time needed to understand concerns and questions, providing excellent perspective and care, and when he's 'out of his element', he's made excellent referrals to help get to the root of the problem. I feel Dr Marcotte and his staff provide 'caring' quality care.

Patient Submitted Review

Jan-2025

Dr. Marcotte and his excellent staff took good care of me as we tested my allergy to penicillin which occurred when I was 5 years old. Every step was explained and carefully executed. Now at 77 I can say I am no longer allergic to penicillin! Wonderful news!

Patient Submitted Review

Jan-2025

Dr Marcotte is very professional and excellent doctor. He reviews all my labs and tests and coordinates my care with all my doctors. He oversees my care to keep me alive and healthy. I am an RN for almost 60 years and have worked with many doctors.

Patient Submitted Review

Jan-2025

First, I am a success story for Dr. Marcotte. Roughly 20 years ago, he created an allergy shot program that eliminated my severe allergy problems. Now I have annual visits. Dr Marcotte is a great listener and as usually happens, I learned some very useful info about a current issue - this time presence of flem that leads to coughing. He is very smart and personable.

Patient Submitted Review

Jan-2025

Dr. Marcotte is excellent at understanding and communicating. The office staff has been great. I miss having a Smyrna or Dover location, but I still go to Middletown because of the quality of care.

Patient Submitted Review

Dec-2024

No waiting when I got there. And the Dr gave me advice that saved me $100 on my prescriptions. Top notch service. Thank you!!!

Patient Submitted Review

Dec-2024

Dr Marcott is a great doctor and explains all the science behind my asthma and answers my questions in great depth. The front office is super friendly and funny. And the nurses giving shots are efficient. Very pleasant experience overall.

rater8 Verified Patient

Dec-2024

Dr. Marcotte saw our 9 month old with a suspected egg allergy. He was very informative and the nurses and staff were very nice and helpful! I highly recommend!

Patient Submitted Review

Dec-2024

It’s always such a pleasant experience seeing Dr. Marcotte. The staff is courteous and friendly. Dr. Marcotte is kind and caring in addition to being a top notch doctor!

rater8 Verified Patient

Dec-2024

I have been with Dr Marcotte for over 30 years and he has always been excellent taking time to listen to you.

Patient Submitted Review

Dec-2024

Dr Marricott is the best.!!!! His bedside manner is phenomenal. Dr Marricott is caring, knowledgeable and humorous with his medical care delivery. He has been treating my allergies and asthma for over 10 years. Wanting to stop smoking, recently , Dr M recommended and prescribed Chainex. It worked......

Patient Submitted Review

Dec-2024

Dr. Marcotte was recommended to me, and he truly lives up to the recommendation. He’s knowledgeable, kind, and patient. He takes the time to listen and understand your concerns, which makes a real difference. I’d be happy to recommend him to anyone looking for thoughtful, quality care.

rater8 Verified Patient

Nov-2024

I was seen at my scheduled time, no waiting! I also appreciated Dr. Marcotte's attentiveness. He listened to me, heard my concerns, AND promptly responded.

Patient Submitted Review

Nov-2024

To start Dr Marcotte’s office got me in to see him after I was bitten by a bug and was having a reaction so that was a great start. Dr Marcotte has a lot of knowledge and is very personable. He helped me recover from the bite by prescribing the meds I needed and he also helped by informing me of discounts available for an EPI pen. I refer others to Dr Marcotte and my kids are patients too.

rater8 Verified Patient

Nov-2024

Dr. Marcotte is an exceptional physician. After many years of recurrent sinus infections, respiratory infections, sinus surgery at another practice, and horrible hives I am finally feeling well and enjoying life! Dr. Marcotte actively listened to my concerns and ordered a very thorough medical work up. His knowledge and expertise in allergy management and immunology is unparalleled in comparison to other local doctors. I highly recommend him. He is genuinely kind and you will not regret entrusting him with your care.

Patient Submitted Review

Nov-2024

Doc was very knowledgeable about the subject and gave me the proper information to address the issues.

Patient Submitted Review

Oct-2024

I appreciate Dr.Marcotte. He always make me aware of additional shots that I need. Where my regular Dr has never said what shots I need or provided me with notes of exactly what I need. That I appreciate because I lack a spleen. He is the best.

rater8 Verified Patient

Oct-2024

Dr Marcotte is an excellent allergy doc. And he’s very kind and respectful to his patients and his staff. I recommend him to anyone suffering from allergies.

Patient Submitted Review

Oct-2024

Dr. Marcotte was great! He took the time to listen to my concerns, and was very thorough in explanations.

Patient Submitted Review

Oct-2024

Very good! I have been Dr. Marcotte’s patient for about 10 years. He is very professional and helpful with my condition. The staff is very helpful too!

Patient Submitted Review

Oct-2024

From the moment I walked into the waiting room I was greeted by very nice and helpful young Ladies at the front desk, who got me checked in right away. There had been paperwork sent to me via mail which I filled out and returned via mail. Unfortunately it was not in the system yet, I get it holidays. When seeing nurse Leslie who did my initial intake, I explained the situation about the paperwork. She stated that she would look for the paperwork for Dr. Marcotte and test results ordered by another physician, she found them all…EXCELLENT WORK LESLIE!!! Dr. Marcotte is such a wonderful soul, from taking his time speaking with me, listening, helping with some tests that he ordered, to just being patient and truly wanting to help me with my symptoms!!! He and his coworkers were definitely worth the trip from Bear to North Wilmington…at rush hour

THANK YOU TO THE WHOLE TEAM! It was very much appreciated!!!

Patient Submitted Review

Sep-2024

I did not wait very long for the doctor. He was friendly and very competent. He answered all my questions and spoke in layman’s terms. He was very thorough.

Patient Submitted Review

Sep-2024

I had an excellent first appointment with Dr. Marcotte. He was so easy to talk to, very thorough, and laid out a clear plan to address my concerns. I am happy to have seen him and have him as part of my care team at ENTAD. Everyone there is very professional, kind, and goes out of their way to deliver an exceptional patient experience-thank you!

Patient Submitted Review

Sep-2024

Dr Marcotte was great, excellent information for me about eosinophilic esophagitis and how to deal with it, how other symptoms might be inter-connected, what is useful, what is not. I felt seen, heard, understood, and that there was a helpful way forward. Greatly appreciate his expertise!

Patient Submitted Review

Sep-2024

I've always liked Dr. Marcotte, because he's knowledgeable, he's patient, he listens when I have questions, he makes suggestions when needed, and I believe he really cares about his patients. There have been times when we were trying to diagnose a problem, and each time, Dr. Marcotte wouldn't give up on trying to find an answer to the problem until he got to the "root" of it. He, also, has no problem with referring me to another doctor when he didn't have the answers to my issues.

Patient Submitted Review

Sep-2024

The staff from beginning to end were excellent. They treated my son very well. Dr Marcott was very nice and allowed plenty of time for questions. I would recommend this practice.

Patient Submitted Review

Sep-2024

Dr marcotte is kind, gentle, patient, knowledgeable. Have always heard good reviews from friends who go to him.I’m happy he's my allergist. I'm glad he now comes to the north Wilmington office.

Patient Submitted Review

Sep-2024

Very excellent listener. Extremely patient, even for a person like myself with several questions. Perhaps more than several questions! I highly recommend this allergist!!

rater8 Verified Patient

Aug-2024

Dr. Marcotte is extremely kind and professional. He has a quiet demeanor that shows his compassion and true desire to see his patients healthy. I couldn't recommend Dr. Marcotte more highly.

Patient Submitted Review

Aug-2024

Amazing staff very welcoming got me in as soon as I got there. So I was on time for my next appointment. Dr. Marcotte was very welcoming. It was my first time he answered every question. I was able to get my allergy test scheduled with no problems. I would definitely recommend him to friends and family.

rater8 Verified Patient

Jul-2024

Dr. Marcotte and his staff were very friendly and helpful. I left the office with lots of new information. I was pleased with the outcome of my visit. Thank you

rater8 Verified Patient

Jul-2024

Great doctor. Took his time with me. Explained what comes next in my treatment carefully and answered all my questions.

Patient Submitted Review

Jul-2024

We saw Shannon Hogate as she offers to see us when Dr Marcotte is running behind with his patient appointments. Shannon thoroughly reviewed directly with my daughter (and the parents as well) the safety plan and made sure she understood what to do in an emergency situation.

Patient Submitted Review

Jul-2024

Dr Marcotte is a great diagnostician and tremendously knowledgeable. Kind, methodical, and a good listener. Wonderful doctor

Patient Submitted Review

Jul-2024

The whole team wonderful. I been with them for so long to me they are like family. They go above and beyond to really try to help and diagnose and prescribe even care for your needs and health. For me it takes a whole group to stabilize me. But I’m most truly grateful. Ty for being wonderful!

rater8 Verified Patient

Jun-2024

Dr. Marcotte has been my Doctor for numerous years. He diagnosed me with an illness that my primary doctor missed. He is the greatest.

Patient Submitted Review

Jun-2024

Always on top of things and friendly. I have experienced the best breathing health of my adult life since working with Dr. Marcotte over the past number of years.

Patient Submitted Review

May-2024

Dr. Marcotte was very personable. He gave me good eye contact and had someone take notes. Some doctors never look up from the computer. He was thorough and friendly and he put me at ease that my allergies will be noted and dealt with.

Patient Submitted Review

May-2024

We have been allergy patients of Dr. Marcotte for years. He is professional but also personable. He takes plenty of time with you. You know that he is focusing on you during the appointment. His staff is just great, as well. The nurses who give the shots are friendly and caring, especially for children who need a little TLC.

Patient Submitted Review

May-2024

Dr. Marcotte was wonderful and compassionate! It was my first appointment with him and he was so thorough and addressed all of my concerns. His action plan for my treatment is comprehensive, and I would highly recommend him!

Patient Submitted Review

Apr-2024

Dr. Marcotte was very pleasant and thorough. He had excellent 'bedside manner.' He answered our questions as best as he possibly could. The office staff was also very pleasant and professional.

Patient Submitted Review

Apr-2024

Dr. Marcotte is a wonderful allergist for my daughter and I am so lucky to have found him. He always answers all our questions and provides excellent care. We always feel we’ve been treated warmly and professionally. We can’t thank him enough.

rater8 Verified Patient

Apr-2024

Patient Submitted Review

Apr-2024

I What to Thanks Dr. Gregory Marcotte, M.D. & His Staff for The Great Excellence Services They’ve Provided Me Today, & I What to Say Thank You for The Great Services You’ve Provided for Me Today

Patient Submitted Review

Apr-2024

Dr Marcotte allowed me to exhaust my list of questions, answered then fully and thoughtfully incorporated my concerns into his treatment plan for me. It helps that he’s a genuinely nice man as well.

Patient Submitted Review

Mar-2024

Dr Marcotte is always patient, through and relaxed. I would highly recommend him for all your allergy needs.

Patient Submitted Review

Mar-2024

Dr. Mascotte has been treating my son since he turn 2 years old. Every year has been a wonderful experience. He works hard to get his patients well and it is his mission.

rater8 Verified Patient

Mar-2024

Dr. Marcotte, Thanks for the recap and wealth of education and knowledge concerning my allergy issues/meds. I left equipped with the ability to make well informed decisions.

rater8 Verified Patient

Mar-2024

Listens well, advice is to the point and reasons provided are thorough, knowledgeable, excellent at what he does.

rater8 Verified Patient

Feb-2024

Dr Marcotte is always patient and understanding. I appreciate his explanations and attention to detail.

Patient Submitted Review

Feb-2024

I was very impressed with Dr Gregory Marcotte in every way. His professionalism, knowledge, patience and patient interaction were all exceptional.

rater8 Verified Patient

Feb-2024

It's ALWAYS a pleasant visit from the time you step into the front office, until you walk back out of it. Dr. Marcotte and his staff are awesome.

Patient Submitted Review

Feb-2024

One thing for certain and two things for sure, Dr. Marcotte is going to find a solution. He’s awesome!

Patient Submitted Review

Jan-2024

Efficient testing and examination with clear explanations. My questions were answered so that I could understand the rationale for recommended treatment. Pleasant office staff.

Patient Submitted Review

Jan-2024

Always a Pleasant experience, the staff is very well equipped, and they are very professional and friendly. Dr. Marcotte seems to care about his patience and has more than one occasion taking care of some medication problems. I was having they are the best.

Patient Submitted Review

Jan-2024

Dr. Marcott takes his time and is thorough. He is very kind and has patience. I highly recommend him.

Patient Submitted Review

Jan-2024

I've been going to Dr. Marcotte for years now, and I've always been satisfied with my care given to me. Even the ladies who give me my shots are so nice and pleasant to all the patients. They all act like they enjoy their jobs there. The scribes who work with Dr. Marcotte when he sees patients are so professional as they enter the info. he gives them on the laptops. I don't remember the name of the young lady who worked with him when I was there earlier this week, but she really impressed me. She listened to him as he dictated to her and put it down. She didn't even have to ask him to repeat anything. He is always so kind and friendly! I'm very pleased with the treatment I get there!!!!

Patient Submitted Review

Dec-2023

Since I started seeing Dr Marcotte in 2019 I haven’t been sick. Before I was constantly sick with bronchitis and pneumonia for years

rater8 Verified Patient

Dec-2023

It’s always such a pleasant experience seeing Dr. Marcotte. Staff is courteous and friendly. Dr. Marcotte is kind and caring in addition to being a top notch doctor!

rater8 Verified Patient

Nov-2023

Dr. Marcotte is always thorough and answers any questions with confidence. I trust him as a partner in my healthcare.

Patient Submitted Review

Nov-2023

Been going to Dr Marcotte for years from my son as a 5 year who us now 33 to my husband. He is the best! Staff very nice and pleasant as well.

Patient Submitted Review

Nov-2023

I’ve been seeing Dr. Marcotte on and off for years! Every time I go in to his office it’s like I was there yesterday! His bedside manner is awesome and he is very knowledgeable and assists in managing my seasonal allergies as well as allergic reactions.

Patient Submitted Review

Nov-2023

Staff was on-time and very friendly. Dr Marcotte listened to me instead of just telling me what to do like some drs do, Good experience.

rater8 Verified Patient

Oct-2023

Dr Marcotte has an excellent bedside manner. He also assures that all questions or concerns are addressed in addition to reviewing the Chart to make sure he has everything covered about your specific conditions and treatments

Patient Submitted Review

Oct-2023

Dr Marcotte treats every patient as if they were family. There is a sincere concern that your questions or concerns are completely addressed. There is specific attention to detail on every aspect of your diagnosis and treatment regimens with confirmation of the patient’s understandingI’d highly recommend Dr Marcotte for all of your allergy or asthma needs

Patient Submitted Review

Oct-2023

He’s been a wonderful and caring dr and so has his whole team of nurses and staff. Thank you for all you do for me.

Patient Submitted Review

Oct-2023

He is a highly esteemed allergist - years of experience and research. I trust him completely to get the best care possible. I would recommend him to anyone. It’s always a very positive experience.

rater8 Verified Patient

Oct-2023

I have been a patient of Dr Marcotte's for over 10yrs. He's the best! I wouldn't go anywhere else. He is incredibly knowledgeable. He really understands how my allergies impact my life and supports me in managing them both medication wise and making changes in my home and lifestyle.

Patient Submitted Review

Oct-2023

As always Dr Marcotte helps me prep for fall allergy season. Always satisfied with the care I receive.

Patient Submitted Review

Sep-2023

Dr. Marcotte is wonderful. He is patient, knowledgeable and kind. He not only helped me at my appointment but went out of his way to look into something for my son who is also a patient at ENT. Highly recommend!

rater8 Verified Patient

Sep-2023

The office fit me in as an emergency walk-in with less than a half hour before they closed. I saw the doctor quickly and was able to get my prescription before the pharmacy closed. Above and beyond expectations.

rater8 Verified Patient

Sep-2023

Dr. Marcotte is always eager to help. He successfully treated my impossible asthma/cough when no one else could find an answer. I always consult him on questions of my health.

Patient Submitted Review

Aug-2023

Quick, pleasant check in. Was attended to right away. Girl that did my beathing test was pleasant, efficient. Shannon was awesome as always. Asks questions, gives feedback, suggestions etc. Never feel rushed. Always recommend!

Patient Submitted Review

Aug-2023

I was very impressed with Dr. Marcotte and found him thorough and very ready to find a solution to my problem though his asking many questions and trying to get to the root of the problem. He has a wonderful "bedside" manner and he's a good listener. I found him easy to talk to.

Patient Submitted Review

Aug-2023

Dr. Marcotte is a wonderful physician. He takes the time to listen to his patients and is genuinely concerned about their health and well-being.

rater8 Verified Patient

Aug-2023

Dr Marcotte is very thorough, knowledgeable, and friendly. He has alway demonstrated excellent bedside manner that makes these appointments very easy for my 5 year old daughter!

Patient Submitted Review

Jul-2023

Never a long wait. Very pleasant, listens and addresses all our concerns every time. Knowledgeable of his field. Offers late appointments which is a huge plus for us.

Patient Submitted Review

Jul-2023

Dr. Marcotte spends an appropriate amount of time with his patients and takes the time to learn how you are doing with his previous recommendations. His suggestions have been a great help in dealing with my year-round allergies.

rater8 Verified Patient

Jul-2023

So focused, thorough and pleasant. Very impressed with my first visit. The staff was also wonderful.

Patient Submitted Review

Jul-2023

Super impressed with Dr. Marcotte and his entire team. I had an allergic reaction today and was seen immediately. The attention I received during such an unsettling time was so appreciated. Would highly recommend Dr. Marcotte for his expertise and nice bedside manner as well as for his awesome staff.

rater8 Verified Patient

Jul-2023

Nice guy, good with kids, can take a joke. Explains things well & is receptive to questions. He also LISTENS.

rater8 Verified Patient

Jun-2023

Dr. Gregory Marcotte is awesome! Sometimes doctors forget to show that they actually care but not Dr. Marcotte. He always goes above and beyond to take care of his patients. You can tell that he loves it and that’s what I like the most about him. He also takes the time to squeeze in patients like myself and get down to the bottom of the source. Whatever the issue is, he’ll have you feeling better in no time! Someone give that man a raise. He deserves it!

Patient Submitted Review

Jun-2023

Always a great experience! We really like Dr. Marcotte and highly recommend him! The office staff are always friendly and helpful and the nurses are amazing with children.

Patient Submitted Review

Aug-2020

All very professional everything I have visited. They are well worth the wait if needed for appointments.

Patient Submitted Review

Jul-2020

Dr. Marcotte and his entire staff are professional, knowledgeable, and kind. I would highly recommend this practice for any age group.

Patient Submitted Review

Sep-2018

Dr. Marcotte is mild mannered and instantly likable. He is extremely bright and knows how to explain various options to patients.

Patient Submitted Review

Dec-2014

Dr. Gregory V Marcotte give a unique care much different than other providers the staff is very professional and courteous and always helpful.

Patient Submitted Review

Apr-2012

A caring professional who understands both his patients and his specialty. Good with both the kids and the parents. A+

Patient Submitted Review

Jun-2010

Dr. Marcotte is absolutely wonderful. I took my two sons to see him for food allergies and he was extremely thorough, very kind to my kids, and extremely knowledgable. I highly recommend him to all my friends and relatives and anyone who asks me for an allergist. I am a pharmacist, so I can pick out the good ones and bad ones....