Brown-Sequard syndrome at C1, sequela

This code signifies the long-term effects or complications arising from a Brown-Sequard syndrome injury specifically located at the C1 level of the cervical spinal cord. Brown-Sequard syndrome is characterized by hemisection of the spinal cord, resulting in ipsilateral motor paralysis and loss of proprioception, and contralateral loss of pain and temperature sensation below the level of the lesion.

Use this code for patients presenting with residual neurological deficits or chronic conditions directly attributable to a past Brown-Sequard injury at the C1 spinal level. Documentation should clearly indicate the C1 level of the original injury and the ongoing nature of the neurological sequelae. This code is appropriate for follow-up encounters after the initial acute injury has healed.

• Requires a seventh character 'S' to denote sequela, indicating the late effects of the initial injury.
• Do not use for acute Brown-Sequard syndrome; instead, use the acute injury codes for the initial encounter.
• Always sequence this code after the primary diagnosis for the current encounter, if applicable, to indicate the underlying cause of the sequela.