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40 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. Seymour Alter, MD is board certified in Internal Medicine.

Education & Awards

Dr. Alter graduated from Boston University .


Dr. Alter has 4 hospital affiliations:

  • St Catherine Of Siena Medical Center 
  • IMC St. John's Episcopal Hospital 


  • French

> > > > Dr. Seymour Alter, MD

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Additional Information
Dr. Seymour DR Alter MD is a male Internist, has 40 years of experience and practices in Internal Medicine.
Where does Dr. Seymour D. Alter practice?
Dr. Seymour Alter has 2 office locations.
Dr. Seymour Alter practices Internal Medicine near Smithtown, NY.
See Smithtown Internists.