You say you're looking for an ICD-10 code, but I'm not clear if you're asking for a diagnosis or an ICD-10-PCS code here? Either way though, there's no way to recommend a code without seeing the documentation or operative report. For a procedure code, a fusion of T10-S1 would encompass up to seven vertebral segments (T10, L1, L2, L3, L4, L5 and S1) or six interspaces (T10-L1, L1-L2, L2-L3, L3-L4, L4-L5, and L5-S1) so you would assign the appropriate codes accordingly depending on the procedures performed and the number of sites treated.
