The 5 Best Allergists in New Hampshire
Board-certified allergy & asthma specialists in Lebanon, Nashua, Portsmouth.
If over-the-counter antihistamines aren't cutting it anymore, a board-certified allergist-immunologist can pinpoint exactly what you're reacting to and build a treatment plan — including immunotherapy that can reduce your sensitivity for good. Our editors researched allergists across New Hampshire and curated the five standouts below based on board certification, affiliations, peer recognition, and patient reputation. Before your visit, check today's pollen levels in New Hampshire so you can tell your doctor what was in the air when your symptoms flared.
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Marcus S. Shaker, MD
Dartmouth Health / Dartmouth-Hitchcock Medical Center
Lebanon, NH
Board-certified in Allergy & ImmunologyFellow of the AAAAI (FAAAAI)Dr. Shaker is a Professor of Pediatrics and of Medicine at Dartmouth's Geisel School of Medicine and a member of the Board of Directors of the AAAAI. He developed New Hampshire and Vermont's first and only food oral immunotherapy program, serves as Associate Editor of Annals of Allergy, Asthma, and Immunology, and has authored over 150 articles and clinical guidelines. He joined the Geisel faculty in 2004.
Areas of focus: Food allergy · Oral immunotherapy · Asthma · Value-based allergy care
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Karen Hsu Blatman, MD
Dartmouth Health / Dartmouth-Hitchcock Medical Center
Lebanon, NH
Board-certified in Allergy & ImmunologyDr. Hsu Blatman is Section Chief of Allergy and Clinical Immunology at Dartmouth-Hitchcock Medical Center and Program Director for the Allergy and Immunology fellowship, as well as an Assistant Professor of Medicine at the Geisel School of Medicine. She received her MD from the University of Iowa College of Medicine and completed her Allergy and Clinical Immunology fellowship at Northwestern University Medical School.
Areas of focus: Asthma · Drug allergy · Clinical immunology · Immunotherapy
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Erin L. Reigh, MD
Dartmouth Health / Dartmouth-Hitchcock Medical Center
Lebanon, NH
Board-certified in Allergy & ImmunologyDr. Reigh is an Assistant Professor of Medicine at the Geisel School of Medicine and has been on the Dartmouth Health allergy faculty since 2016. She received her medical degree from Georgetown University and completed her Allergy & Clinical Immunology fellowship at Washington University in St. Louis. She is nationally recognized for penicillin allergy de-labeling quality improvement initiatives and is the creator of the educational cartoon series "Marginal Zone" published monthly in Annals of Allergy, Asthma & Immunology.
Areas of focus: Drug allergy · Penicillin allergy evaluation · Immune deficiency · Pollen monitoring
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Amit Kumar, MD
Southern New Hampshire Asthma & Allergy
Nashua, NH
Board-certified in Allergy & ImmunologyBoard-certified in Internal MedicineFellow of the AAAAI (FAAAAI)Fellow of the ACAAI (FACAAI)Dr. Kumar received his medical degree from SUNY Upstate Medical University, completed his residency at Rutgers University, and his fellowship at the Medical College of Wisconsin. He is affiliated with Southern New Hampshire Medical Center in Nashua and is a member of both the AAAAI and ACAAI, with over 20 years of clinical experience serving the southern New Hampshire region.
Areas of focus: Asthma · Allergic rhinitis · Food allergies · Immunotherapy
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Barbara Deuell, MD
Allergy Associates of New Hampshire
Portsmouth, NH
Board-certified in Allergy & ImmunologyDr. Deuell received her medical degree from the Jacobs School of Medicine & Biomedical Sciences at the University at Buffalo, completed a Pediatrics residency at Duke University Hospital, and an Allergy and Immunology fellowship at the University of Virginia Medical Center. She has been practicing with Allergy Associates of New Hampshire in Portsmouth and Dover for over 40 years and is affiliated with Wentworth-Douglass Hospital.
Areas of focus: Asthma · Allergic rhinitis · Food allergies · Immunotherapy
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How we chose the best allergists in New Hampshire
Our editorial team researched allergy and immunology specialists practicing across New Hampshire and selected these five based on:
- Board certification in Allergy & Immunology (ABAI)
- Hospital and academic affiliations with respected medical centers
- Peer recognition, including Top Doctor awards and professional society roles
- Practice reputation and years of experience treating allergy and asthma patients
- Geographic spread across New Hampshire's major metro areas
These listings are editorial picks, not paid placements or medical endorsements, and we have no financial relationship with any provider listed. Physician availability, insurance participation, and credentials change — always verify directly with the practice before booking. This page is for informational purposes and is not medical advice.
Frequently asked questions
How do I find a good allergist in New Hampshire?
Look for board certification in Allergy & Immunology, hospital or academic affiliations, and an established practice. Every allergist on this list was vetted against those criteria.
Do I need a referral?
It depends on your insurance plan, not the state. Most PPO plans let you book directly; HMO plans usually require a referral from your primary care physician.
What should I bring to my first appointment?
A list of your symptoms and when they occur, your current medications, your insurance card, and any relevant medical records. A symptom diary matched against local pollen counts is especially useful for diagnosing seasonal allergies.
Track New Hampshire pollen before your visit
Allergists can diagnose you faster when you know which days your symptoms flared and what was in the air. MyPollenPal tracks daily tree, grass, and weed pollen levels for cities across New Hampshire.