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Geneticist, Obstetrician & Gynecologist (OB/GYN)
27 years of experience
Accepting new patients
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).

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Specialties & Research

Dr. Mark Johnson, MD is board certified in Clinical Genetics (M.D.) and Obstetrics & Gynecology.

  • He has special expertise in 16 areas:
  • Aneuploidy
  • Birth Defects or Abnormalities (Congenital Abnormalities)
  • Chromosome Aberrations
  • Down Syndrome
  • Fetal Diseases
  • Gynecology
  • Hot Flashes
  • Hydrops Fetalis
  • Menopause
  • Multiple Abnormalities
  • Neural Tube Defects
  • Oligohydramnios
  • Pregnancy Complications
  • Pregnancy in Diabetics
  • Premature Labor
  • Urogenital Abnormalities

Education & Awards

Dr. Johnson graduated from University of Minnesota, Twin Cities, Minneapolis. He has 2 awards.

One of America's Leading Experts on:
Birth Defects or Abnormalities (Congenital Abnormalities)
Fetal Diseases


Dr. Johnson has 3 hospital affiliations:

  • Hospital of the University of PA 
  • Children's Hospital of Philadelphia 
  • PA Hospital of The University of PA Health System 

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Additional Information
Dr. Mark Paul Johnson MD is a male Medical Geneticist, has 27 years of experience and practices in Obstetrics & Gynecology, Clinical Genetics, and M.D..
Where does Dr. Mark P. Johnson practice?
Dr. Mark Johnson has 4 office locations.
Dr. Mark Johnson practices Obstetrics & Gynecology, Clinical Genetics, and M.D. near King Of Prussia, PA.
Additional practice locations include: Chalfont, PA and Exton, PA.
See King Of Prussia Obstetricians & Gynecologists and King Of Prussia Geneticists.