ICD-10 Code A52.14 – Late syphilitic encephalitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A52.14 – Late syphilitic encephalitis
What it is
This code identifies encephalitis caused by late-stage syphilis, meaning inflammation of the brain due to Treponema pallidum infection. Use it when the record documents a late syphilitic neurologic process affecting the brain.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include cognitive decline, personality change, confusion, seizures, or focal neurologic deficits, depending on the extent of central nervous system involvement.
When to use this code
Use A52.14 when the provider documents late syphilitic encephalitis, neurosyphilis with encephalitic involvement, or a confirmed late syphilitic brain infection. Apply the code only when the diagnosis is clearly stated in the chart. If the note is nonspecific, check documentation before assigning the code.
Do not use for
Do not use this code for early syphilis, meningitis without encephalitis, or neurologic symptoms without documented syphilitic cause. Check documentation if the record only says “neurosyphilis” without specifying encephalitis.
Coding tip
Code the condition as documented and confirm that “late syphilitic encephalitis” or equivalent wording appears in the provider record.