N.J. Stat. Ann. § 17:35C-4

Notwithstanding any other provision of law of this State to the contrary, a medicare supplement contract may not deny a claim for losses incurred more than 6 months from the effective date of coverage for a preexisting condition. The contract may not define a preexisting condition more restrictively than a condition for which medical advice was given or treatment was recommended by or received from a physician within 6 months before the effective date of coverage.