Question: What is the correct code for a selective nerve root injection? Nebraska Subscriber Answer: Medical professionals often interchange the term "selective nerve root injection" with "transforaminal epidural injection," so you should choose a code from the 64479-64484 range. Although some carriers use the two terms interchangeably, others do not, so you should check with your payer to determine which ICD-9 codes it accepts for selective nerve root injection.