ICD-10 Code G36.9 – Acute disseminated demyelination, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G36.9 – Acute disseminated demyelination, unspecified
What it is
This code identifies acute disseminated demyelination when the record does not specify a more precise form. It refers to a demyelinating disorder affecting the central nervous system, with cause or subtype not further defined.
Clinical signs
Clinical features vary; refer to documentation. Typical notes may describe acute neurologic deficits, multifocal central nervous system involvement, or imaging findings consistent with demyelination.
When to use this code
Use G36.9 when the provider documents acute disseminated demyelination but does not identify a specific subtype or etiology. It is appropriate when the chart supports the diagnosis, yet details are insufficient for a more specific code. If the record names a different demyelinating condition, code that condition instead.
Do not use for
Do not use this code for other specified demyelinating disorders with a documented cause or subtype. Check documentation if the note instead describes a chronic, relapsing, or non-disseminated demyelinating disease.
Coding tip
Query the provider when the diagnosis is vague, because “unspecified” should be used only when the record lacks enough detail.