ICD-10 Code G04.91 – Myelitis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G04.91 – Myelitis, unspecified
What it is
Myelitis is inflammation of the spinal cord. Use this code when the record identifies myelitis but does not specify the cause, level, or type.
Clinical signs
Common findings include weakness, sensory changes, back pain, and bowel or bladder dysfunction. Clinical features vary; refer to documentation.
When to use this code
Use G04.91 when the provider documents myelitis without further detail and no more specific code is available. It also fits cases where the spinal cord inflammation is confirmed, but the etiology remains unspecified in the note.
Do not use for
Do not use this code if the chart identifies a specific cause, such as infection, autoimmune disease, or another defined spinal cord disorder. Check documentation for a more precise diagnosis.
Coding tip
Assign the most specific myelitis code supported by the record; if the documentation stays nonspecific, G04.91 is appropriate.