You need to contact the state CNA registry online or through the US Mail. You can also renew online. We've even left you the link at the bottom of the page.
You will need to provide notarized documentation of having worked a minimum of 8 hours as a CNA in the last 24 months.
Your Tennessee CNA license is valid for 24 months from the last time you renewed.
There is no fee for CNA license renewal in Tennessee.