Section 163-A. Health insurance adjustment

1.  For  the purposes of this
  section, the term "supplementary plan" shall  mean  a  health  insurance
  plan  which  provides  an  adjustment  to the deductible or co-insurance
  liability or to the benefits provided by the statewide health  insurance
  plan  purchased  pursuant  to  section  one  hundred  sixty-two  of this
  article.
    2. The president may require the insurer of a  supplementary  plan  to
  the  statewide  health  insurance  plan,  provided  as  a  result  of  a
  collectively negotiated agreement pursuant to article fourteen  of  this
  chapter,   to   make   a  comparable  supplementary  plan  available  to
  participating employers as of  the  implementation  date  of  the  state
  employees'  supplementary plan.  The comparable supplementary plan shall
  be experience rated as to those  participating  employers  electing  it,
  with the costs thereof allocated equitably among them.
    3.  Every  participating  employer  which,  on  or  before July first,
  nineteen hundred eighty-five, entered  into  a  collectively  negotiated
  agreement  pursuant  to  article  fourteen of this chapter with employee
  organizations representing its employees to provide the statewide health
  insurance plan shall provide such comparable supplementary plan  on  the
  date   established  by  the  president  until  the  expiration  of  such
  negotiated agreement.