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Thomas D. Horn, MD

  • Vice Chair, Department of Dermatology
  • Medical Director, MGPO Dermatopathology Associates
  • Clinical Professor of Dermatology & Pathology, Harvard Medical School


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Thomas Horn, MD, MBA, is a recognized expert in the fields of dermatology and pathology.




Clinical Interests
  • Dermatology (general)
  • Warts
  • Graft-versus-host disease
  • Clinicopathologic correlation
  • Dermatopathology
  • HIV dermatology
Medical Education
  • MD, University of Virginia Medical School
  • Residency, University of Maryland Baltimore
  • Fellowship, Johns Hopkins University School of Medicine|Fellowship, University of Virginia Medical School
Board Certifications
  • Dermatology
  • Dermatopathology
  • Boston: Massachusetts General Hospital
  • Newton: Newton-Wellesley Hospital
Insurances Accepted
  • Aetna Health Inc.
  • Beech Street
  • Blue Cross Blue Shield - Blue Care 65
  • Blue Cross Blue Shield - Indemnity
  • Blue Cross Blue Shield - Managed Care
  • Blue Cross Blue Shield - Partners Plus
  • Centene/Celticare
  • Cigna (PAL #'s)
  • Fallon Community HealthCare
  • Great-West Healthcare (formally One Health Plan)
  • Harvard Pilgrim Health Plan - ACD
  • Harvard Pilgrim Health Plan - PBO
  • Health Care Value Management (HCVM)
  • Humana/Choice Care PPO
  • MassHealth
  • Medicare
  • Medicare - ACD
  • Neighborhood Health Plan - ACD
  • Neighborhood Health Plan - PBO
  • OSW - Maine
  • OSW - New Hampshire
  • OSW - Rhode Island
  • Private Health Care Systems (PHCS)
  • Railroad Medicare
  • Railroad Medicare - ACD
  • Senior Whole Health
  • TriCare
  • Tufts Health Plan
  • Unicare
  • United Healthcare (non-HMO) - ACD
  • United Healthcare (non-HMO) - PBO
Patient Age Group

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Dr. Horn is a leader in advancing the clinical, research, and educational aspects of the fields of dermatology and dermatopathology. He is Executive Director of the American Board of Dermatology, and Director of Dermatology Grand Rounds at Massachusetts General Hospital.

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Research & Publications

Research Summary

In addition to basic science research on Graft-versus-Host Disease, Dr. Horn recently contributed to the National Institute of Health (NIH) Development Project on Criteria for Clinical Trials in Chronic Graft-versus-Host Disease Consensus Conference of 2014. Conference outcomes include new information from histopathological studies of GVHD in the gut, liver, skin, and oral mucosa and an expanded discussion of GVHD in the lungs and kidneys. 


View my most recent publications at PubMed

Dr. Horn has over 85 articles listed on PubMed. Journals include Nature (Journal of Investigative Dermatology), the Journal of the American Academy of Dermatology, and JAMA Dermatology.

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Dermatology Associates
50 Staniford Street
2nd Floor
Boston MA, 02114-2517
Phone: 617-726-2914
Fax: 617-726-7768
Pathology Associates
55 Fruit Street
Boston MA, 02114-2696
Phone: 617-726-2967
MGH Dermatopathology Center
2 Wells Avenue
Newton MA, 02459-3208
Phone: 855-644-3376
Fax: 617-658-9399
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