ICD-10 Code G23.1 – Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G23.1 – Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
What it is
G23.1 identifies progressive supranuclear ophthalmoplegia, a rare neurodegenerative disorder that affects eye movement and posture control. It is also known as Steele-Richardson-Olszewski syndrome.
Clinical signs
Typical findings include slowed vertical eye movements, especially difficulty looking down, plus early balance problems and falls. Clinical features vary; refer to documentation.
When to use this code
Use G23.1 when the provider documents progressive supranuclear ophthalmoplegia or Steele-Richardson-Olszewski syndrome. Code it when the diagnosis is established in the record and the visit relates to this neurologic condition. Check documentation if the note only mentions parkinsonism or nonspecific gait instability.
Do not use for
Do not use this code for unspecified movement disorders, Parkinson disease, or isolated eye muscle weakness without the documented syndrome. Check documentation when the diagnosis is uncertain.
Coding tip
Confirm the exact neurologic diagnosis in the assessment, not just the symptoms, before assigning G23.1.