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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. William Lemaster:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. William Lemaster is Good. Dr. Lemaster has been reviewed by 9 patients who have provided 3 comments. The rating is 4 out of 5 stars.

Patient Ratings
Ease of Appointment 3.8
Promptness 3.8
Courteous Staff 3.8
Accurate Diagnosis 3.8
Bedside Manner 3.8
Spends Time with Me 3.8
Follows Up After Visit 3.8

Specialties & Research

  • He 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. Lemaster graduated from A.T. Still University - Kirksville.


Dr. Lemaster has 2 hospital affiliations:

  • John T Mather Memorial Hospital 
  • John T Mather Memorial Hospital of Port Jefferson New York I 


  • Spanish

> > > > Dr. William Lemaster, DO

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Additional Information
Dr. William Grant Lemaster DO is a male Psychiatrist, has 30 years of experience and practices in Psychiatry.
Where does Dr. William G. Lemaster practice?
Dr. William Lemaster has 1 office location.
Dr. William Lemaster practices Psychiatry near Port Jefferson, NY.
See Port Jefferson Psychiatrists.