N.H. Rev. Stat. Ann. § 263:6-d

Any licensed health care provider who reasonably and in good faith believes a person cannot safely operate a motor vehicle based on clinical evaluation appropriate to his or her practice and who reports such to the division of motor vehicles shall be immune from any civil or criminal liability that might otherwise result from making the report. All reports made and medical records reviewed and maintained by the division of motor vehicles pursuant to this section shall be considered motor vehicle records under RSA 260:14.