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 with Parkinsonism
 * Lewy body dementia
 * Lewy body disease
 * G31.84 Mild cognitive impairment, so stated
 * Excludes1: age related cognitive decline (R41.81)
 * altered mental status (R41.82)
 * cerebral degeneration (G31.9)
 * change in mental status (R41.82)
 * cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01, I69.11, I69.21, I69.31, I69.81, I69.91)
 * cognitive impairment due to intracranial or head injury (S06.-)
 * dementia (F01.-, F02.-, F03)
 * mild memory disturbance (F06.8)
 * neurologic neglect syndrome (R41.4)
 * personality change, nonpsychotic (F68.8)
 * G31.89 Other specified degenerative diseases of nervous system
 * G31.9 Degenerative disease of nervous system, unspecified

G32 Other degenerative disorders of nervous system in diseases classified elsewhere

 * G32.0 Subacute combined degeneration of spinal cord in diseases classified elsewhere
 * Dana-Putnam syndrome
 * Sclerosis of spinal cord (combined) (dorsolateral) (posterolateral)
 * Code first underlying disease, such as:
 * vitamin B12 deficiency (E53.8)
 * anemia (D51.9)
 * dietary (D51.3)
 * pernicious (D51.0)
 * Excludes1: syphilitic combined degeneration of spinal cord (A52.11)
 * G32.8 Other specified degenerative disorders of nervous system in diseases classified elsewhere
 * Degenerative encephalopathy in diseases classified elsewhere
 * Code first underlying disease, such as:
 * cerebral degeneration (due to):
 * amyloid (E85.-)
 * hypothyroidism (E00.-, E03.-)
 * neoplasm (C00-D48)
 * vitamin B deficiency, except thiamine (E52-E53.-)
 * Excludes1: superior hemorrhagic polioencephalitis [Wernicke's encephalopathy] (E51.2)

=Demyelinating