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Sprain of atlanto-occipital (joints) Whiplash injury of cervical spine. ICD-10-CM Diagnosis Code S13.4XXA [convert to ICD-9-CM] Sprain of ligaments of cervical spine, initial encounter. Cervical spine sprain; Sprain or strain of cervical spine; Traumatic torticollis; Whiplash injury of neck; Whiplash injury to neck.