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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (2)

The overall average patient rating of Dr. Charles Leff is Good. Dr. Leff has been reviewed by 3 patients who have provided 2 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 5.0
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 4.3
Follows Up After Visit 5.0

Specialties & Research

Dr. Charles Leff, MD is board certified in Internal Medicine, Hematology, and Medical Oncology.

  • He has special expertise in 11 areas:
  • Acute Myeloid Leukemia
  • Breast Cancer
  • Cancer
  • Chronic Myeloid Leukemia
  • Chronic Myelomonocytic Leukemia
  • Colon Cancer
  • Deep Vein Thrombosis
  • Hepatitis C
  • Leukemia
  • Lung Cancer
  • Metastatic Breast Cancer

Education & Awards

Dr. Leff graduated from Upstate Medical University Physical Medicine and Rehabilitation, Syracuse.


Dr. Leff has 6 hospital affiliations:

  • Saint Peter's University Hospital 
  • John F Kennedy Medical Center 


  • Spanish

> > > > Dr. Charles Leff, MD

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Additional Information
Dr. Charles Allen Leff MD is a male Internist, has 43 years of experience and practices in Internal Medicine, Hematology, and Medical Oncology.
Where does Dr. Charles A. Leff practice?
Dr. Charles Leff has 3 office locations.
Dr. Charles Leff practices Internal Medicine, Hematology, and Medical Oncology near Plainfield, NJ.
Additional practice locations include: Somerville, NJ and Somerset, NJ.
See Plainfield Internists, Plainfield Hematologists, and Plainfield Oncologists.