ICD-10 Code G25.82 – Stiff-man syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G25.82 – Stiff-man syndrome
What it is
G25.82 identifies stiff-man syndrome, a rare neurologic disorder marked by persistent muscle stiffness and episodic spasms. Use this code when the diagnosis is documented and the chart refers to this specific syndrome.
Clinical signs
Typical findings include axial and limb rigidity, painful spasms, and exaggerated response to sudden stimuli. Clinical features vary; refer to documentation for the exact presentation and any confirmed diagnostic workup.
When to use this code
Use G25.82 when the provider documents stiff-man syndrome, stiff-person syndrome, or a clearly equivalent diagnosis. It may also apply when the record describes classic rigidity and stimulus-triggered spasms consistent with this condition. If the diagnosis is uncertain, check documentation before coding.
Do not use for
Do not use this code for general muscle stiffness, spasticity, or other movement disorders without a documented stiff-man syndrome diagnosis. Do not assume it applies to symptoms alone.
Coding tip
Code only when the provider names the syndrome or clearly confirms it in the assessment.