Question: Nevada Subscriber Answer: Nevertheless, some possibilities include using an abnormal radiological findings ICD-9 code like 793.0 (Nonspecific (abnormal) findings on radiological and other examination of skull and head) -- that is, if something abnormal was seen on an xray. You can use 784.99 (Other symptoms involving head and neck) for the reason you performed the biopsy. You can also code V71.89 (Observation for other specified suspected conditions).