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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. John Pfeifer:

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Specialties & Research

Dr. John Pfeifer, MD is board certified in Anatomic Pathology and Pathology - Molecular Genetic Pathology.

  • He has special expertise in 11 areas:
  • Abdominal Cancer
  • Genetic Translocation
  • Glandular Cancer (Adenocarcinoma)
  • Malignant Joint Cancer (Synovial Sarcoma)
  • Nerve Sheath Cancer
  • Ovarian Cancer
  • Primitive
  • Second Primary Neoplasms
  • Soft Tissue Cancer
  • Soft Tissue Cancer (Sarcoma)
  • Uterine Cancer (Endometrial Neoplasm)

Education & Awards

Dr. Pfeifer graduated from University of California at San Diego, La Jolla.


Dr. Pfeifer has 1 hospital affiliations:

  • Barnes Jewish Hospital 

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Additional Information
Dr. John David Pfeifer MD is a male Pathologist, has 24 years of experience and practices in Pathology, Anatomic Pathology, and Molecular Genetic Pathology.
Where does Dr. John D. Pfeifer practice?
Dr. John Pfeifer has 1 office location.
Dr. John Pfeifer practices Pathology, Anatomic Pathology, and Molecular Genetic Pathology near Saint Louis, MO.
See Saint Louis Pathologists.