Question: I’m still pretty new to neurosurgery coding, and I’m curious about the different types of cerebral transient ischemic attacks (TIAs). Could you break each type of TIA down along with the corresponding diagnosis codes? Oregon Subscriber Answer: Just about all of the cerebral TIA ICD-10 codes you’ll need are all located in the G45.- (Transient cerebral ischemic attacks and related syndromes) subsection of your manual. From there, things get a bit complicated, as none of the TIAs are actually referred to as “transient ischemic attack” in their descriptors. Here’s the codes you’ll be choosing from for specified cerebral TIAs, along with explanations of the conditions, per Codify by AAPC: If none of the above diagnoses fits the bill, you might want to opt for G45.8 (Other transient cerebral ischemic attacks and related syndromes); if you use this code, be sure to include a description of the condition as to explain why the less-specific G45.8 code is appropriate. If the notes indicate that the TIA was simply “TIA” — or it is classified as a “spasm of cerebral artery” or “transient cerebral ischemia NOS” — choose G45.9 (Transient cerebral ischemic attack, unspecified).