Amnestic disorder due to diseases classified elsewhere

Essential (Required) Features:

• All diagnostic requirements for Amnestic Disorder are met.
• There is evidence from history, physical examination, or laboratory findings that symptoms are caused by the direct physiological consequences of a medical condition (e.g., a Disease of the Nervous System, a traumatic brain injury, an infection, a tumour, or other disease process affecting areas of the brain involved in memory). This judgment depends on establishing that:
• The medical condition is known to be capable of producing memory impairment;
• The course of the memory impairment (e.g., onset, trajectory of symptoms, response to treatment) is consistent with causation by the medical condition.

Note: When Amnestic Disorder is due to a disease, condition or injury classified elsewhere (including Disorders Due to Substance Use), the diagnostic code corresponding to that disease, condition or injury should assigned along with Amnestic Disorder. When the etiological condition is unknown, the diagnosis 8A2Z Disorders with Neurocognitive Impairment as a Major Feature, Unspecified may be assigned in addition to Amnestic Disorder.

Potentially Explanatory Medical Conditions (examples):

• Anaemias or Other Erythrocyte Disorders
• Certain Infectious or Parasitic Diseases (e.g., meningitis)
• Diseases of the Nervous System (e.g., cerebral ischaemic stroke, cerebral palsy, epilepsy or seizures, hypoxic-ischaemic encephalopathy)
• Endocrine Diseases (e.g., hypothyroidism)
• Intracranial injury
• Metabolic Disorders (e.g., hypo-osmolality or hyponatraemia)
• Neoplasms of the brain or central nervous system
• Nutritional Disorders (e.g., vitamin B1 deficiency, vitamin B12 deficiency)