Mass. Gen. Laws ch. 231, § 60L
(c) The 182–day notice period in subsection (a) shall be shortened to 90 days if:
(e) The notice given to a health care provider under this section shall contain, but shall not be limited to, a statement including:
(g) Within 150 days after receipt of notice under this section, the health care provider or authorized representative against whom the claim is made shall furnish to the claimant or the claimant's authorized representative a written response that contains a statement including the following: