Tabes dorsalis

Tabes dorsalis is a late-stage manifestation of neurosyphilis, characterized by progressive degeneration of the posterior columns of the spinal cord, dorsal roots, and dorsal root ganglia. This leads to sensory ataxia, lancinating pains, Argyll Robertson pupils, and bladder dysfunction. It is a chronic and debilitating neurological condition resulting from untreated syphilis infection.

This code is used when a patient presents with documented signs and symptoms consistent with tabes dorsalis, such as lightning pains, gait disturbances, or specific pupillary abnormalities, and a confirmed history of syphilis. Documentation should clearly indicate the neurological involvement specific to the posterior column degeneration.

• Ensure documentation explicitly states "tabes dorsalis" or describes the characteristic neurological findings of this condition in the context of syphilis.
• Do not confuse with other forms of neurosyphilis; this code is specific to the posterior column degeneration.
• Always sequence this code as the primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting care.