N.Y. Ins. Law § 4320
No insurer, subsidiary of an insurer, or controlled person of a holding company system may act as an administrator or claims paying agent, as opposed to an insurer, on behalf of a group which denies or limits benefits for a specific disease or condition or for a procedure or treatment unique to a specific disease or condition in a manner which would be inconsistent with this chapter or regulations promulgated by the superintendent had the group purchased insurance. No insurer, subsidiary of an insurer, or controlled person of a holding company may provide stop loss, catastrophic or reinsurance coverage to groups which deny or limit benefits for a specific disease or condition or for a procedure or treatment unique to a specific disease or condition in a manner which would be inconsistent with this chapter or regulations promulgated by the superintendent had the group purchased insurance. A limit, maximum, or other mechanism that controls total coverage without regard to a specific disease or condition shall not be deemed one that denies or limits benefits for a specific disease or condition, or for a procedure or treatment unique to a specific disease or condition. Nothing herein shall be construed to mandate the inclusion of specified benefits in an employer group plan, if such plan is not subject to the provisions of this chapter.
N.Y. Ins. Law § 4320