ICD-10 Code G37.5 – Concentric sclerosis [Balo] of central nervous system (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G37.5 – Concentric sclerosis [Balo] of central nervous system
What it is
G37.5 identifies concentric sclerosis, also called Balo disease, a rare demyelinating disorder of the central nervous system. Use it when documentation names this specific condition.
Clinical signs
Clinical features vary; refer to documentation. Reports may describe focal neurologic deficits, symptoms of a demyelinating brain lesion, or imaging findings consistent with concentric rings.
When to use this code
Use G37.5 when the clinician documents Balo disease, Balo concentric sclerosis, or concentric sclerosis of the central nervous system. It may appear in neurology notes, discharge summaries, or imaging-based assessments. If the record only says “demyelinating disease,” check documentation before coding this specific diagnosis.
Do not use for
Do not use this code for multiple sclerosis or other unspecified demyelinating disorders unless Balo disease is clearly documented. Check documentation if the diagnosis is only suspected.
Coding tip
Code G37.5 only when the provider explicitly links the condition to Balo or concentric sclerosis.