New York Codes, Rules and Regulations
Title 12 - DEPARTMENT OF LABOR
Chapter V - Workers' Compensation
Subchapter C - Medical Treatment and Care
Part 325 - Medical And Surgical Care And Treatment
Subpart 325-6 - Reimbursement for workers' compensation claims paid by health insurers; arbitration of disputed requests for reimbursement
Section 325-6.16 - Party modification of HIMP

A health insurer and a carrier may agree to modify certain aspects of the HIMP reimbursement process, including the deadlines for service, the means of service between the parties, the conditions required for reimbursement, or other aspects of HIMP reimbursements, by executing a written agreement setting forth any such modified conditions and specifying whether the modifications shall be enforceable through arbitration.