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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).

Learn more about Dr. Leonard Zwelling:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. Leonard Zwelling, Medical Oncologist is Poor. Dr. Zwelling has been reviewed by 1 patients who have provided 1 comments. The rating is 1 out of 5 stars.

Patient Ratings
Ease of Appointment 1.0
Promptness 1.0
Courteous Staff 3.7
Accurate Diagnosis 1.0
Bedside Manner 1.0
Spends Time with Me 1.0
Follows Up After Visit 1.0

Specialties & Research

Dr. Leonard Zwelling, MD is board certified in Internal Medicine and Medical Oncology.

  • He has special expertise in 8 areas:
  • Acute Myeloid Leukemia
  • Acute Promyelocytic Leukemia
  • Breast Cancer
  • Cancer
  • Head and Neck Cancer
  • Leukemia
  • Metastatic Breast Cancer
  • Squamous Cell Carcinoma

Education & Awards

Dr. Zwelling graduated from Duke University , Durham. He has 1 awards.

One of America's Leading Experts on:


Dr. Zwelling has 2 hospital affiliations:

  • M D Anderson Cancer Center 
  • Univ Of Tx Md Anderson Cancer Ctr 


  • Spanish

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Additional Information
Dr. Leonard Alan Zwelling MD is a male Internist, has 39 years of experience and practices in Internal Medicine and Medical Oncology.
Where does Dr. Leonard A. Zwelling practice?
Dr. Leonard Zwelling has 1 office location.
Dr. Leonard Zwelling practices Internal Medicine and Medical Oncology near Houston, TX.
See Houston Internists and Houston Oncologists.