Have you ever wondered how to code a spinal injury that is healed but still causing clinical trouble? Today we are looking at S23.150S, which represents a sequela of a subluxation at the T8/T9 thoracic vertebra. This code is used when the acute phase of the subluxation has passed, but the patient is experiencing late effects or complications from the original injury. Mastering the use of the seventh character 'S' is essential for accurate long-term trauma billing and avoiding immediate claim denials.