- Mount Sinai Doctors
- Treats Children
- Accepting New Patients
Justine Fenner Biederman, MD
Dermatology
About Me
Dr. Justine Fenner is a compassionate Pediatric Dermatologist and Assistant Professor at the Kimberly and Eric J. Waldman Department of Dermatology at Mount Sinai, and is known for her dedication to providing exceptional care to her young patients. Dr. Fenner earned her medical degree from Stony Brook School of Medicine where she was elected to the Alpha Omega Alpha (AOA) honor society for her academic achievements and to the Gold Foundation for Humanism in Medicine Honor Society for her commitment to compassionate care. She completed her intern year in Pediatrics at Maria Ferrari Children's Hospital where she was recognized for her passion for education with the Gold Humanism Teaching Award. Dr. Fenner pursued her residency in Dermatology at the Icahn School of Medicine at Mount Sinai, where she graduated as chief resident. Guided by her love of children, she pursued a Pediatric Dermatology fellowship at Columbia University, refining her specialized knowledge in the field. Dr. Fenner is delighted to return to Mount Sinai, where she finds immense joy in caring for children and their unique dermatological needs. Her areas of interest include alopecia and acne, as well as inflammatory skin diseases such as eczema, contact dermatitis, and psoriasis. She is dedicated to staying up-to-date with the latest advancements in the field and providing the best possible care to her patients. Outside of medicine, she indulges in her love for all things Disney, baking treats for family and friends and appreciating nature through hiking and gardening.
Language
English
Position
ASSISTANT PROFESSOR | Dermatology, ASSISTANT PROFESSOR | Pediatrics, General Pediatrics
Hospital Affiliations
- Mount Sinai Beth Israel
- Mount Sinai Morningside
- Mount Sinai Brooklyn
- Mount Sinai Queens
- The Mount Sinai Hospital
- Mount Sinai West
Clinical Focus
- Acne
- Adolescent Dermatology
- Allergic Contact Dermatitis
- Alopecia Areata
- Biopsy
- Birthmarks
- Cryotherapy
- Dermoscopy
- Eczema
- Freezing of Warts
- Hair Loss
- Hemangioma
- Mole Checks
- Moles
- Molluscum Contagiosum
- Phototherapy
- Port Wine Stain
- Psoriasis
- Rash
- Skin Biopsy
- Skin Cancer Screening
- Skin Lesion Removal
- Vascular Laser
- Vitiligo
- Warts
Education
MD, State University of New York at Stony Brook
Internship, Pediatrics
Westchester Medical Center
Residency, Dermatology
Mount Sinai Hospital
Fellowship, Pediatric Dermatology
New York Presbyterian Hospital/Columbia University
Certifications
American Board of Dermatology
Insurance Information
Accepted insurance may vary by the doctor’s office location. Please contact the office directly to obtain the most up-to-date insurance information. Patients with Anthem Blue Cross Blue Shield (formerly known as Empire) please click here for more information. Patients with Molina insurance should click here for more information. Mount Sinai’s contracts with Anthem and Molina expired on December 31.
- 1199 SEIU
- 32BJ Health Fund
- AETNA - Commercial
- AETNA - Medicare
- Amidacare Medicaid
- CIGNA Healthcare
- Centivo
- Elderplan
- EmblemHealth - GHI-PPO
- EmblemHealth - HIP
- EmblemHealth - HIP-Medicaid
- EmblemHealth - HIP-Medicare
- Fidelis Health Care
- HealthFirst Medicaid
- HealthFirst Medicare
- Horizon NJ
- Magnacare-Health Care
- Medicare - NJ
- Medicare - NY
- Metroplus
- Multiplan PHCS
- NJ Medicaid
- NY Medicaid
- Oscar
- Oxford - Freedom and Liberty
- United Health Care - Commercial
- United Health Care - Empire Plan
- United Health Care - Oxford Care
- United Health Care - Top Tier
- VNSNY Choice Medicare
- VNSNY Select Health Medicaid
- VillageCareMax
- WellCare Health Plan
Physicians who provide services at hospitals and facilities in the Mount Sinai Health System might not participate in the same health plans as those Mount Sinai hospitals and facilities (even if the physicians are employed or contracted by those hospitals or facilities).
Information regarding insurance participation and billing by this physician may be found on this page, and can also be obtained by contacting this provider directly. Because physicians insurance participation can change, the insurance information on this page may not always be up-to-date. Please contact this physician directly to obtain the most up-to-date insurance information.
Insurance and health plan networks that the various Mount Sinai Health System hospitals and facilities participate in can be found on the Mount Sinai Health System website.
Patient Experience Star Ratings and Comments
The Patient Experience Star Rating reflects our patients’ perception of how well their Mount Sinai provider communicated with them during an office visit. The Star Rating is based on patient responses to three questions on a patient experience survey, a standardized questionnaire sent to verified patients and distributed by a third party vendor, Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score.
Dr. Fenner was able to work with my son, who was recently hospitalized and discharged and had a recurring infection that could have easily ended up with another admission. Dr. Fenner had a very appropriate bedside manner that helped put my 3 year old at ease. She was able to help him feel comfortable and distract him enough to complete what was a very invasive exam given his condition. Thank you Dr. Fenner and team for your care.
Not very in depth conversation on care. Spoke too quickly for me or my child to ask questions
Dr. Fenner is so awesome with my teenage girl.
Industry Relationships
Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device, biotechnology companies, and other outside entities to improve patient care, develop new therapies and achieve scientific breakthroughs. In order to promote an ethical and transparent environment for conducting research, providing clinical care and teaching, Mount Sinai requires that salaried faculty inform the School of their outside financial relationships.
Below are financial relationships with industry reported by Dr. Fenner Biederman during 2025 and/or 2026. Please note that this information may differ from information posted on corporate sites due to timing or classification differences.
Consulting or Other Professional Services Examples include, but are not limited to, committee participation, data safety monitoring board (DSMB) membership
- Nobelpharma
Mount Sinai’s faculty policies relating to faculty collaboration with industry are posted on our website. Patients may wish to ask their physician about the activities they perform for companies.