Tabes dorsalis

This code represents tabes dorsalis, a late-stage manifestation of neurosyphilis characterized by progressive degeneration of the posterior columns of the spinal cord and dorsal roots. It results from chronic syphilitic infection, leading to sensory ataxia, lancinating pains, and various neurological deficits.

Assign this code when documentation clearly indicates a diagnosis of tabes dorsalis, often presenting with symptoms like Argyll Robertson pupils, Charcot joints, or bladder dysfunction in a patient with a history of syphilis. Supporting documentation should include neurological examination findings and serological evidence of syphilis.

• Ensure documentation specifies "tabes dorsalis" and not just general neurosyphilis, as other forms exist.
• Always code the underlying infectious agent (syphilis) first, if not already documented as resolved.
• Differentiate from other causes of ataxia or neuropathies; the syphilitic etiology must be explicit.