(a) Any adult (18 years of age or over) who, because of a temporary or chronic physical condition or mental disability, needs a substitute home may be admitted when, in the opinion of the resident, physician, family or social worker, and the administrator the services and accommodations of the home will meet his particular needs.
(b) Exceptions. People are not to be admitted:
(1) for treatment of mental illness, or alcohol or drug abuse;
(2) for maternity care;
(3) for professional nursing care under continuous medical supervision;
(4) for lodging, when the personal assistance and supervision offered for the aged and disabled are not needed; or
(5) who pose a direct threat to the health or safety of others.