World Health Organization

The World Health Organization (WHO) is "a specialized agency of the United Nations that is concerned with public health. It was established on 7 April 1948, and is headquartered in Geneva, Switzerland. The WHO is a member of the United Nations Development Group. Its predecessor, the Health Organization, was an agency of the League of Nations."

The International Statistical Classification of Diseases and Related Health Problems (ICD) is maintained by WHO.

ICD-10 is the 10th revision of the ICD. Different countries' government healthcare systems will use slightly different codes governed by the ICD.

Myalgic encephalomyelitis
Myalgic encephalomyelitis has been classified by the WHO as a neurological disease since 1969 and has occurred in both epidemic and sporadic form since at least the 1930s, although is probably much older.

United States
G93.3 houses Postviral fatigue syndrome and benign myalgic encephalomyelitis.

2018 ICD-10-CM Index › 'E' Terms ›

Encephalomyelitis G04.90 - see also Encephalitis
 * acute disseminated G04.00
 * infectious G04.01
 * noninfectious G04.81
 * postimmunization G04.02
 * postinfectious G04.01
 * acute necrotizing hemorrhagic G04.30
 * postimmunization G04.32
 * postinfectious G04.31
 * specified NEC G04.39
 * benign myalgic G93.3
 * equine A83.9
 * Eastern A83.2
 * Venezuelan A92.2
 * Western A83.1
 * in diseases classified elsewhere G05.3
 * myalgic, benign G93.3
 * postchickenpox B01.11
 * postinfectious NEC G04.01
 * postmeasles B05.0
 * postvaccinal G04.02
 * postvaricella B01.11
 * rubella B06.01
 * specified NEC G04.81
 * Venezuelan equine A92.2

Chronic fatigue syndrome
Chronic fatigue syndrome is classified NOS "not otherwise specified". ICD 9 (and 10) "consider NOS the physician's fault: The documentation does not provide enough information to assign a more specific diagnosis code."

United States
ICD-10-CDC Diagnosis Code R53.82 is for Chronic fatigue, unspecified.

ICD-10-CM R53.82 is grouped within Diagnostic Related Group(s) (MS-DRG v35.0):
 * 947 Signs and symptoms with mcc
 * 948 Signs and symptoms without mcc

Convert R53.82 to ICD-9-CM

Code History
 * 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
 * 2017 (effective 10/1/2016): No change
 * 2018 (effective 10/1/2017): No change

Code annotations containing back-references to R53.82:
 * Type 1 Excludes: G93.3

Diagnosis Index entries containing back-references to R53.82:
 * Fatigue R53.83
 * chronic R53.82


 * Syndrome - see also Disease
 * fatigue
 * chronic R53.82

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Learn more
2009, WHO ICD in relation to M.E. and "CFS"—Short via The Hummingbirds' Foundation for ME History of Chronic Fatigue Syndrome - International Classifications via Wikipedia