2010 New York Code
WKC - Workers' Compensation
Article 2 - (9 - 35) COMPENSATION
13-J - Medical or surgical treatment by insurance carriers and employers.

§  13-j.  Medical  or  surgical  treatment  by  insurance carriers and
  employers. (1)  An  insurance  carrier  shall  not  participate  in  the
  treatment  of  injured  workers, except as provided in paragraph five of
  subdivision (i) of section thirteen  of  this  article  and  subdivision
  seven  of  section  thirteen-a  of  this article and except, that it may
  employ medical inspectors to examine  compensation  cases  periodically,
  while under treatment, and report upon the adequacy of medical care, and
  other  matters  relative  to  the medical conduct of the case, a copy of
  which report shall be filed directly with the chair within ten days, and
  that it  may  maintain  rehabilitation  bureaus  operated  by  qualified
  physicians  if  authorized  by  the  chair  in  accordance  with section
  thirteen-c of this article. (2) An employer may maintain a  compensation
  medical  bureau  at the place or places of employment, if such bureau is
  required because of  the  nature  of  the  industrial  hazards,  or  the
  frequency  of injuries to employees arising out of industry. Such bureau
  or  bureaus  shall  be  authorized  and  licensed  pursuant  to  section
  thirteen-c,  and  their  use by an injured employee shall be optional in
  accordance with the provisions of section thirteen-a.