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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. Kathleen Semmler:

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Specialties & Research

  • She has special expertise in 7 areas:
  • Attention Deficit Disorder (ADD) / Attention Deficit Hyperactivity Disorder (ADHD)
  • Bipolar Disorder / Manic Depressive Disorder
  • Depression
  • Depressive Disorder
  • Insomnia
  • Schizophrenia
  • Sleep Disorders

Education & Awards

Dr. Semmler graduated from University of Missouri at Columbia.


Dr. Semmler has 1 hospital affiliations:

  • Napa State Hospital 

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Additional Information
Dr. Kathleen Gay Semmler MD is a female Psychiatrist, has 36 years of experience and practices in Psychiatry.
Where does Dr. Kathleen G. Semmler practice?
Dr. Kathleen Semmler has 1 office location.
Dr. Kathleen Semmler practices Psychiatry near Fairfield, CA.
See Fairfield Psychiatrists.