2010 New York Code
PBH - Public Health
Article 29-C - (2980 - 2994) HEALTH CARE AGENTS AND PROXIES
2989 - Effect on other rights.

§  2989.  Effect  on  other  rights. 1. A competent adult's failure to
  appoint a health care agent or to provide the agent with specific health
  care instructions pursuant to this article shall create no  presumptions
  regarding the adult's wishes about health care.
    2.  Nothing  in  this article creates, expands, diminishes, impairs or
  supersedes any authority that a principal may have under law to make  or
  express   decisions,  wishes  or  instructions  regarding  health  care,
  including decisions about life  sustaining  treatment,  whether  or  not
  expressed in a health care proxy.
    3. This article is not intended to permit or promote suicide, assisted
  suicide,  or  euthanasia; accordingly, nothing herein shall be construed
  to permit an agent to consent to  any  act  or  omission  to  which  the
  principal could not consent under law.