ICD-10 Code A52.13 – Late syphilitic meningitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A52.13 – Late syphilitic meningitis
What it is
A52.13 identifies meningitis caused by late-stage syphilis. Use it when the record documents syphilitic infection involving the meninges, not just a history of syphilis.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include headache, cranial nerve involvement, neck stiffness, or other neurologic signs consistent with meningeal inflammation.
When to use this code
Use this code when the provider clearly documents late syphilitic meningitis, neurosyphilis with meningeal involvement, or an equivalent diagnosis. It may also apply when the note links meningitis to late syphilis and supports current active disease. Check documentation if the record only mentions prior syphilis without meningitis.
Do not use for
Do not use it for syphilis without meningeal involvement, nonspecific meningitis, or a remote history of treated syphilis. If the chart does not show late syphilitic meningitis, code the documented condition instead.
Coding tip
Verify that the provider connects meningitis to late syphilis; otherwise, you may need a different neurosyphilis or meningitis code.