Section 9.03. Admission to a hospital

Unless  otherwise specifically provided for by statute, a mentally ill
  person shall be admitted to a hospital as an in-patient only pursuant to
  the  provisions  of  this  article,  except  that  chemically  dependent
  patients  may  be admitted to chemical dependence facilities operated by
  such hospitals under contract or agreement with the office of alcoholism
  and substance abuse  services  in  accordance  with  the  provisions  of
  article  twenty-two  of  this chapter. The section of the mental hygiene
  law under which a patient is admitted or under which any change of legal
  status is subsequently effected shall be stated in the patient's record.