N.H. Rev. Stat. § 415:18-b
No group accident or health insurance contract, authorized under this chapter, may be cancelled or nonrenewed by the insurer, except for nonpayment of premium, unless the group policyholder receives either a notice of cancellation or nonrenewal or an offer of renewal in accordance with this section. The notice of cancellation or nonrenewal or offer of renewal shall be delivered to the group policyholder or mailed to the group policyholder's last address as shown in the records of the insurer at least 45 days prior to the renewal date of the contract. Notice of cancellation for lack of participation, if permitted by the terms of the policy, shall be delivered to the group policyholder or mailed to the group policyholder's last address as shown in the records of the insurer, at least 30 days prior to the effective date of the cancellation.
RSA 415:18-b
1990, 194:2. 1991, 23:1, eff. Jan. 1, 1992.