In Tennessee, the certification card is for identification purposes only. The card does not have an expiration date. It has an issue date only. Your certification expires 24 months after your issue date but you will not receive a new card every time you renew. The card can be replaced for name change, when stolen, lost or destroyed. For additional help with getting a replacement card you should contact the TN Department of Health at 615-532-5171 or by email at CNA.Health@tn.gov .