Neurasthenia

This code represents neurasthenia, a neurosis characterized by chronic fatigue, weakness, and various somatic symptoms such as headaches, dizziness, and digestive disturbances, without a clear organic cause. Patients often experience diminished mental and physical energy, difficulty concentrating, and irritability. It reflects a historical diagnostic concept for a constellation of non-specific symptoms.

Use this code when documentation explicitly states a diagnosis of "neurasthenia" or describes a patient presenting with chronic, debilitating fatigue and a range of somatic complaints that are not attributable to a physical disease or another mental disorder. This diagnosis is less common in modern psychiatric practice but may appear in older medical records or from providers using historical diagnostic terminology.

• This is a legacy ICD-9-CM code; ensure the encounter is for a date of service prior to ICD-10-CM implementation.
• Differentiate from chronic fatigue syndrome (CFS) or other fatigue-related conditions, which have more specific diagnostic criteria in contemporary medicine.
• Avoid using this code if more specific psychiatric diagnoses (e.g., major depressive disorder, anxiety disorder) or organic causes for fatigue are documented.