About
Dr. Len Horovitz is a nationally recognized internist and pulmonary specialist practicing concierge medicine in Manhattan. He graduated from Brown University summa cum laude and earned membership in Phi Beta Kappa before completing his medical degree at New York University School of Medicine. His training took him through a pediatric residency at Mount Sinai Hospital, then a residency in internal medicine and a pulmonary medicine sub-specialty at Lenox Hill Hospital.
Dr. Horovitz holds staff positions at Lenox Hill Hospital, part of Northwell, and Weill Cornell Hospital, part of NY-Presbyterian. He serves as a Clinical Instructor in Medicine at Weill Cornell Medical College. Castle Connolly named him a Top Doctor, The New York Times recognized him as a Super Doctor, and New York Magazine listed him among the city's Best Doctors. WHO'S WHO named him Pulmonary Professional of the Year. Patients trust him for both primary care and complex pulmonary concerns, many returning to his practice for well over a decade.
Education & Training
Undergraduate
Brown University, summa cum laude, Phi Beta Kappa
Medical School
New York University School of Medicine (MD)
Residency
Pediatric residency at Mount Sinai Hospital; Residency in Internal Medicine at Lenox Hill Hospital
Fellowship
Sub-specialty in Pulmonary Medicine at Lenox Hill Hospital
Conditions Treated
Who is Dr. Horovitz right for?
Dr. Horovitz is an excellent fit for adults seeking a single physician for both primary care and pulmonary needs. Patients managing chronic respiratory conditions or complex internal medicine concerns benefit from his dual specialization. His long-tenured patient relationships reflect his strength in ongoing, relationship-driven care. Adults in Manhattan who want access to a physician affiliated with Lenox Hill and Weill Cornell will find his practice well-positioned for coordinated hospital care.
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Frequently Asked Questions
Dr. Horovitz treats a wide range of adult internal medicine and pulmonary conditions. His pulmonary focus includes respiratory illnesses and chronic lung conditions. He also manages the full spectrum of primary care needs, from preventive health to complex chronic disease.
Dr. Horovitz holds specialization in both internal medicine and pulmonary medicine. He completed a formal sub-specialty training in pulmonary medicine at Lenox Hill Hospital following his internal medicine residency.
Dr. Horovitz earned his undergraduate degree from Brown University, where he graduated summa cum laude, and his MD from New York University School of Medicine. He completed a pediatric residency at Mount Sinai Hospital and then a residency in internal medicine with a pulmonary sub-specialty at Lenox Hill Hospital.
Dr. Horovitz holds staff positions at Lenox Hill Hospital, part of the Northwell Health system, and Weill Cornell Hospital, part of NY-Presbyterian. These affiliations allow him to coordinate care for patients who require hospital-level services.
Yes. Dr. Horovitz serves as Clinical Instructor in Medicine at Weill Cornell Medical College. This academic role keeps him connected to the latest developments in internal and pulmonary medicine.
Dr. Horovitz has received recognition from several leading sources. Castle Connolly named him a Top Doctor, The New York Times recognized him as a Super Doctor, and New York Magazine listed him among New York's Best Doctors. WHO'S WHO also named him Pulmonary Professional of the Year.
Yes. Dr. Horovitz manages both primary care and pulmonary concerns for his patients. Many of his patients rely on him as a single physician for preventive care, chronic disease management, and respiratory health.
Many of Dr. Horovitz's patients have maintained relationships with him spanning two decades or more. His practice emphasizes continuity, and long-term relationships are a hallmark of how he delivers care.
Doctor profile last updated March 21, 2026