Coding: ICD-10 Code M45.7 describes ankylosing spondylitis of the lumbosacral region, a billable ICD-10-CM diagnosis code valid for FY2026. M45.7 became effective October 1, 2025 and belongs to the M45 parent category covering ankylosing spondylitis by anatomical site. https://t.co/jBmoD0CVps