Late congenital syphilitic meningitis

This code describes inflammation of the meninges (membranes surrounding the brain and spinal cord) caused by Treponema pallidum infection acquired congenitally, with symptoms manifesting after two years of age. It represents a neurological complication of late congenital syphilis.

Use this code for patients diagnosed with syphilitic meningitis where the infection was acquired at birth and neurological symptoms developed in later childhood or adulthood. Documentation should clearly indicate congenital origin and the specific neurological involvement of meningitis.

• Ensure documentation specifies "late" congenital syphilis and meningitis as the neurological manifestation.
• Distinguish from early congenital syphilitic meningitis (A50.01) based on age of onset.
• Consider co-occurring manifestations of late congenital syphilis, such as interstitial keratitis or Hutchinson's teeth, and code them separately if present.