ICD-10 Code G11.4 – Hereditary spastic paraplegia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G11.4 – Hereditary spastic paraplegia
What it is
G11.4 identifies hereditary spastic paraplegia, a group of inherited neurologic disorders marked by progressive stiffness and weakness of the legs. It is used when the diagnosis is documented as hereditary spastic paraplegia.
Clinical signs
Typical findings include slowly progressive lower-extremity spasticity, weakness, gait difficulty, and hyperreflexia. Clinical features vary; refer to documentation if the presentation is unclear or if additional neurologic findings are present.
When to use this code
Use G11.4 when the provider documents hereditary spastic paraplegia, spastic paraplegia, or a confirmed hereditary form of progressive leg spasticity. Apply it for outpatient, inpatient, or problem-list coding when the diagnosis is established and not merely suspected. Check documentation for any subtype or associated neurologic disorder.
Do not use for
Do not use this code for acquired spasticity, cerebral palsy, or nonspecific gait abnormality without a documented hereditary disorder. If the chart only says “rule out” or “possible” hereditary spastic paraplegia, check documentation.
Coding tip
Confirm that the record supports a hereditary diagnosis before assigning G11.4, and code any documented associated neurologic conditions separately when appropriate.