The Administrative Office of the Courts has released the form that must be filed by plaintiffs in medical negligence cases (and by defendants who allege fault of another health care provider). Both forms are available here.
In general, a plaintiff must file the certificate within 90 days after filing suit.
My partner Rebecca Blair had an article about the new statute published as the cover story of the Tennessee Bar Journal. The article can be viewed here.
Those who intend to file a medical malpractice suit should carefully review the new statute that went into effect October 1. Rebecca does a nice job of summarizing the statute in the article referenced above.