from the evicore guidelines
62323
Injection(s), of diagnostic or therapeutic substance(s) (e.g., anesthetic, antispasmodic, opioid, steroid, other solution), not including neurolytic substances, including needle or catheter placement, interlaminar epidural or subarachnoid, lumbar or sacral (caudal); with imaging guidance (i.e., fluoroscopy or CT)
64483 says something similar and doesn’t include the word contrast, yet obviously you need contrast for a TFESI. If you read deeper into their definitions, they say contrast needs to be used. See this link-