Language: English, Chinese (Mandarin)
Gender: Male
Accepting New Patients: Yes
WCM Physician (What is this?)

Specialties & Expertise


  • Dermatology, General
  • Cosmetic Dermatology


  • Skin Cancer
  • Eczema
  • Acne
  • Psoriasis
  • Skin Cyst
  • STD (Sexually Transmitted Disease)
  • Warts
  • Condyloma
  • Platelet Rich Plasma (PRP)
  • Aesthetic Dermatology

Insurance Plans Accepted

The following represents most of the managed care plans accepted by this physician. If your insurance carrier does not appear here please contact the physician’s office as they may have individual contracts not included on this site.

* indicates this physician is no longer accepting new patients with this insurance plan.

  • AETNA - Medicare
  • Aetna - Weill Cornell - POS
  • Affinity Access
  • Affinity Health Plan
  • Blue Priority Network
  • Empire Blue Cross/Blue Shield - PPO
  • Empire Blue Cross/Blue Shield - Mediblue (Senior)
  • Empire Blue Cross/Blue Shield - Pathway X
  • Empire Blue Cross/Blue Shield - Pathway X Enhanced
  • Empire Blue Cross/Blue Shield - EPO
  • Empire Blue Cross/Blue Shield - HMO
  • Empire Empire Blue Cross/Blue Shield HealthPlus
  • Empire Empire Blue Cross/Blue Shield HealthPlus - CHP
  • Fidelis Care
  • Health First
  • Medicaid
  • Medicare
  • Oxford Health Plans - Medicare Advantage
  • Oxford Health Plans - Freedom
  • Rockefeller University - CoreSource
  • United Empire
  • United Health Care - Community Plan
  • United Health Care
  • VNSNY CHOICE - Medicare
  • WellCare Health Plans
  • WellCare Health Plans
  • WellCare Health Plans


Board Certifications

  • Dermatology

Clinical & Academic Positions

Associate Attending Dermatologist
NewYork-Presbyterian Hospital

Associate Professor of Clinical Dermatology
Weill Cornell Medical College, Cornell University

Education & Training

  • M.D., University of South Carolina Medical School, 1985
  • Ph.D., University of Notre Dame, 1975

Honors & Awards

NIH Grant NS16120-01,02,03               1980-1983


South Carolina Biomedical Research Grant, 22320 A10      1980


Dr. Gaan received his Ph.D. in biochemistry at the University of Notre Dame, and finished his post-doctoral fellowship at the Delta Research Center of Tulane University. He completed his medical education at the Medical University of South Carolina while serving as a research assistant professor in the Department of Neurology. Dr. Gaan was a recipient of a NIH Grant and a Muscular Dystrophy Grant to study the biosynthesis and degradation of glycosphingolipids. Prior to joining the Weill Cornell Department of Dermatology he had a private practice, and served as a voluntary attending physician at Mt. Sinai Medical Center.

To schedule an appointment, please call 646-962-DERM (3376).