Acute transverse myelitis in demyelinating disease of cnsl

This code identifies an acute inflammatory condition affecting the spinal cord, characterized by demyelination, specifically occurring as a manifestation within a broader demyelinating disease of the central nervous system. It involves rapid onset of neurological deficits such as weakness, sensory loss, and bowel/bladder dysfunction due to damage to the myelin sheath of spinal cord neurons.

Apply this code when documentation clearly indicates acute transverse myelitis in a patient with an established or newly diagnosed demyelinating disease of the CNS, such as those on the multiple sclerosis spectrum. Supporting documentation should detail the acute onset of myelopathy and evidence of demyelination.

• Do not code this with G35 (Multiple sclerosis) or G36.0 (Neuromyelitis optica [Devic]) as these are Excludes1 conditions.
• Ensure the documentation specifies "acute" transverse myelitis and links it to an underlying demyelinating CNS disease.
• Distinguish from acute flaccid myelitis (G04.82), which is also an Excludes1 condition and has a different etiology.