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This allows ICF to be coded as fatigue or unspecified chronic fatigue, and help distinguish it from other forms of fatigue including cancer-related fatigue, chronic fatigue syndrome, fatigue due to depression, fatigue due to old age, weakness/asthenia, and in the ICD-10, also from fatigue lasting under 6 months.
The earlier ICD-10 system categorized neurasthenia under "F48 – Other neurotic disorders". [22] Under "F48.0 Neurasthenia", the characteristics of the disorder differ among various cultures. Two overlapping symptoms can be present: Increased fatigue after mental exertion can be associated with a reduction in cognitive function.
The International Classification of Diseases (ICD) is an international standard diagnostic classification for a wide variety of health conditions. The ICD-10 states that mental disorder is "not an exact term", although is generally used "...to imply the existence of a clinically recognisable set of symptoms or behaviours associated in most cases with distress and with interference with ...
People suffered from "chronic or recurrent fatigue", among a large number of other symptoms. [1]: 28–29 The initial link between elevated antibodies and the Epstein–Barr virus led to the name "chronic Epstein–Barr virus syndrome". The CDC renamed it chronic fatigue syndrome (CFS), as a viral cause could not be confirmed in studies.
Other symptoms that may occur during PEM include cognitive impairment, flu-like symptoms, pain, weakness, and trouble sleeping. [6] [4] Though typically cast as a worsening of existing symptoms, patients may experience some symptoms exclusively during PEM. [6] Patients often describe PEM as a "crash", "relapse", or "setback". [6]
The categorizations and the diagnostic criteria were largely unchanged. No new disorders or conditions were introduced, although a small number of subtypes were added and removed. ICD-9-CM codes that were changed since the release of IV were updated. [4] The DSM-IV and the DSM-IV-TR both contain a total of 297 mental disorders. [5]
Diseases and disorders MAC Mycobacterium avium complex: MBD Minimal brain dysfunction: MCS Multiple chemical sensitivities: MD Muscular dystrophy: MDS Myoclonic dystonia: MDD Major depressive disorder: MDR TB Multi-drug-resistant tuberculosis: ME Myalgic Encephalomyelitis: ME/CFS Myalgic encephalomyelitis/chronic fatigue syndrome: MERS
Major depressive episodes may show comorbidity (association) with other physical and mental health problems. About 20–25% of individuals with a chronic general medical condition will develop major depression. [5] Common comorbid disorders include eating disorders, substance-related disorders, panic disorder, and obsessive-compulsive disorder.