Section 13. Reclassification of disabilities

Subject to the limitations in
  section  fifty-one  of  this  chapter  and  in   section   one   hundred
  twenty-three of the workers' compensation law as made applicable to this
  chapter   by   section   fifty-seven   of  this  chapter,  the  workers'
  compensation board may at any time, without regard to the  date  of  the
  injury, upon its own motion, or on application of any party in interest,
  reclassify  a  disability  upon  proof  that  there has been a change in
  condition, or that the previous classification was erroneous and not  in
  the interest of justice.