An act relating to damages in negligence actions; creating s. 768.755, F.S.; providing that a claimant in certain negligence actions may recover damages for the cost of medical or health care services only if such services are medically necessary; providing a methodology to calculate an award of damages for the cost of such medical or health care services; specifying evidence that is admissible and inadmissible in determining the award of damages; requiring an alternative calculation of damages if certain insurers file a lien or subrogation claim in the action; prohibiting the use of a finding of medical necessity for certain purposes; providing applicability; providing a directive to the Division of Law Revision and Information; providing an effective date.