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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 (7)

The overall average patient rating of Dr. Leonard Klein, Internist is Excellent. Dr. Klein has been reviewed by 8 patients who have provided 7 comments. The rating is 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 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. Leonard Klein, MD is board certified in Hematology.

  • He has special expertise in 15 areas:
  • Acute Myeloid Leukemia
  • Adult T-Cell Leukemia-Lymphoma
  • Blood Disorders
  • Blood Transfusion
  • Bone Marrow Transplantation
  • Breast Cancer
  • Chronic B-Cell Lymphocytic Leukemia
  • Clinical Research
  • Deep Vein Thrombosis
  • Epidemiology
  • Hepatitis C
  • Leukemia
  • Lymphoma
  • Multiple Myeloma (Cancer of Plasma Cells)
  • Myeloid Leukemia

Education & Awards

Dr. Klein graduated from State University of New York at Buffalo. He has 2 awards.

Castle Connolly's Top Doctors™ (2012 - 2013)
Patients' Choice Award (2012)


Dr. Klein has 5 hospital affiliations:

  • Northwest Community Hospital 
  • Advocate Lutheran General Hospital 


  • Spanish

> > > > Dr. Leonard Klein, MD

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Additional Information
Dr. Leonard M Klein MD is a male Hematologist, has 36 years of experience and practices in Hematology.
Where does Dr. Leonard M. Klein practice?
Dr. Leonard Klein has 2 office locations.
Dr. Leonard Klein practices Hematology near Niles, IL.
Additional practice locations include: Chicago, IL.
See Niles Hematologists.