Dr. John Leff, MD

Dr. John Leff, MD

Endocrinology, Diabetes & Metabolism  ·  
Male  ·  
Age 70
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Dr. John Leff, MD is an endocrinology, diabetes & metabolism specialist in Brooklyn, NY and has been practicing for 31 years. He graduated from SUNY Downstate Medical Center College Of Medicine in 1978 and specializes in endocrinology, diabetes & metabolism.

150 55th St

Brooklyn, NY 11220

Contact Information

(718) 630-7942

Insurance Accepted

  • Aetna
  • Blue Cross Blue Shield
  • Cigna
  • EmblemHealth
  • Empire Blue Cross Blue Shield
  • Guardian
  • Humana
  • Medicaid
  • MultiPlan
  • 3 More

*Please verify this information when scheduling an appointment.

Background Check

No malpractice claims found for New York
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
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Experience Check

Check Dr. Leff's experience treating your condition or procedure

Dr. Leff's Top Procedures and Conditions

Treatment Frequency
Diabetes Type 2
very high
very high

Treatment Frequency

Dr. Leff treats Diabetes Type 2 more than 99% of his peers

Dr. Leff treats this condition more than 99% of his peers

Thyroid Disease
very high
very high

Treatment Frequency

Dr. Leff treats Thyroid Disease more than 91% of his peers

Dr. Leff treats this condition more than 91% of his peers

Hypothyroidism
high
high

Treatment Frequency

Dr. Leff treats Hypothyroidism more than 88% of his peers

Dr. Leff treats this condition more than 88% of his peers

Dr. Leff's conditions and procedures:

Abnormal Thyroid
Acromegaly and Gigantism
Adrenal Gland Diseases
Adrenal Incidentaloma
Adrenal Insufficiency
Autoimmune Diseases
Autoimmune Thyroid Diseases
Benign Tumor
Bone Disorders
Breast Diseases
Calcium Metabolism Disorders
Cancer
Congenital Adrenal Hyperplasia (CAH)
Craniopharyngioma
Diabetes Counseling
Diabetes Insipidus
Diabetes Type 1
Diabetes Type 2
Female Infertility
Goiter
Graves' Disease
Hashimoto's Disease
Hypercalcemia
Hyperkalemia
Hyperlipidemia
Hyperparathyroidism
Hyperthyroidism
Hypokalemia
Hypopituitarism
Hyposmolality and Hyponatremia
Hypothyroidism
Kidney Disease
Lipid Disorders
Malaise and Fatigue
Male Infertility
Menstrual Disorders (incl. Dysmenorrhea)
Obesity
Osteopenia
Osteoporosis
Overweight
Polycystic Ovarian Syndrome
Pregnancy-Related Disorders
Retina Diseases
Symptomatic Menopause
Testicular Dysfunction
Thyroid Cancer
Thyroid Disease
Thyroiditis
Vitamin D Deficiency

About Me

Biography

Dr. John Leff, MD is an endocrinology, diabetes & metabolism specialist in Brooklyn, NY and has been practicing for 31 years. He graduated from SUNY Downstate Medical Center College Of Medicine in 1978 and specializes in endocrinology, diabetes & metabolism.

Specialties

  • Endocrinology, Diabetes & Metabolism

Board Certifications

  • Diabetes, Metabolism & Endocrinology

Education

1987
Joslin Diab Ctr/New Deaconess Hospital
Fellowship Hospital
1983
SUNY Downstate Med Center
Fellowship Hospital
1981
Staten Island Hospital
Residency Hospital
1979
Staten Island Hospital
Internship Hospital
1978
SUNY Downstate Medical Center College Of Medicine
Medical School
1987
1983
1981
1979
1978

Awards

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Locations

Insurance accepted

Accepted insurance can change. Please double-check when making an appointment.

Aetna
Aetna Test HMO
Choice Plus Test POS II
Blue Cross Blue Shield
Blue Card Test PPO
Cigna
Cigna HMO
Cigna PPO
Great West Healthcare-Cigna PPO
Open Access
EmblemHealth
GHI HMO
GHI PPO
Empire Blue Cross Blue Shield
Empire Blue Cross Blue Shield HMO
Guardian
Humana
Choice Care PPO
Medicaid
MultiPlan
MultiPlan Test PPO
PHCS Network PPO
MVP Health Care
MVP Health Care PPO
Oxford Health Plans
Freedom Plan
UnitedHealthCare
Choice Plus Test POS
Options PPO
Oxford Liberty

Affiliated Hospitals

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