Primary Care


Clinical Interests
  • Chronic disease management
  • Adult primary care medicine
  • General internal medicine
Medical Education
  • MD, SUNY Downstate College of Medicine
  • Residency, Brigham and Women's Hospital
Board Certifications
  • Internal Medicine
Foreign Languages
  • Hebrew
  • Hungarian
  • Boston: Massachusetts General 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
  • BMC HealthNet Mass Health MCO/ACO
  • Cigna (PAL #'s)
  • Commonwealth Care Alliance
  • 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)
  • TriCare
  • Tufts Health Plan
  • Unicare
  • United Healthcare (non-HMO) - ACD
  • United Healthcare (non-HMO) - PBO
  • Well Sense Pediatrics

Note: This provider may accept more insurance plans than shown; please call the practice to find out if your plan is accepted.

Patient Age Group
Provider Gender


Daniel M. Horn, MD is the Assistant Medical Director for Ambulatory Quality at the Massachusetts General Physician Organization, where he leads efforts to improve the quality of care for 160,000 patients across 21 primary care practices. Dr. Horn is also a primary care physician and Unit Chief at Internal Medicine Associates, where he provides comprehensive primary care and helps with day to day leadership of the largest primary care practices at Mass General. Dr. Horn is board certified in Internal Medicine and is an instructor at Harvard Medical School. He graduated Columbia University with a B.A. in Religion, and received his M.D. degree at SUNY Downstate College of Medicine. He completed his residency in primary care and population medicine at a joint program between Brigham and Women's Hospital, Harvard Vanguard Medical Associates, and the Department of Population Medicine at Harvard Medical School. Dr. Horn is trained in various process improvement methodologies and is certified as an Improvement Advisor by the Institute for Healthcare Improvement.

Research & Publications


View my most recent publications at PubMed


Internal Medicine Associates Team 1
15 Parkman Street
Boston, MA 02114-3117
Phone: 617-726-2374
Fax: 617-726-4495