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. "It is a system of diagnostic codes for classifying diseases, including nuanced classifications of a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or disease."

History with ME/CFS
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.

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."

Postvirual fatigue syndrome (PVFS) is the name used for benign myalgic encephalomyelitis and chronic fatigue syndrome in newly released the ICD-11 and remains a disorder of the nervous system.

ICD Diagnostic coding
ICD-10 is the 10th revision of the ICD and was first published in 1992. The ICD-11 was published in July 2018, but is not implemented in most countries at present.

Different countries' government healthcare systems might use different codes depending on their interpretation of some diseases, illnesses, and syndromes but still working within the ICD code structure. When using ICD10Data.com, certain pages will display a country's flag indicating the diagnostic coding used by that nation's healthcare system. Additionally, a country does not have to officially implement the latest ICD release; the United States delayed the implementation of ICD-10 for 23 years.

ICD-10-CM
United States


 * G93.3 houses Postviral fatigue syndrome and benign myalgic encephalomyelitis.

ICD-10-CM G93.3 is grouped within Diagnostic Related Group(s) (MS-DRG v35.0):


 * 947 Signs and symptoms with mcc
 * 948 Signs and symptoms without mcc

Convert G93.3 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 G93.3:


 * Type 1 Excludes: A85, R53.82
 * Type 2 Excludes: G04

Diagnosis Index entries containing back-references to G93.3:


 * Akureyri's disease G93.3
 * Disease, diseased - see also Syndrome
 * Iceland G93.3
 * Encephalomyelitis G04.90 - see also Encephalitis
 * benign myalgic G93.3
 * myalgic, benign G93.3
 * Neuromyasthenia G93.3 (epidemic) (postinfectious)
 * Syndrome - see also Disease
 * postviral NEC G93.3
 * fatigue G93.3

ICD-11 (2018)

 *  8E49 Postviral fatigue syndrome 

All ancestors up to top


 * 08 Diseases of the nervous system


 * Other disorders of the nervous system
 * 8E49 Postviral fatigue syndrome

Inclusions


 * Benign myalgic encephalomyelitis
 * chronic fatigue syndrome

There ICD-11 no longer has a fatigue syndrome of any kind in the Mental and Behavioral Disorders section. Neurasthenia is not mentioned in any section. In response to the Wessely school's textbook stating that Chronic Fatigue Syndrome can be classed as a mental disorder, Audre L'Hours from World Health Organization has started that a disorder can only be classed under one rubic, and that all WHO countries must follow the WHO classification of Chronic Fatigue Syndrome or Myalgic Encephalomyelitis as a neurological disorder only.

ICD-10-CM
United States


 * R53.82 is for Chronic fatigue, unspecified under ICD-10-CM Diagnosis Code.

R53.82 (ICD-10-CM) 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

ICD-11 (2019)

 *  8E49 Postviral fatigue syndrome 

All ancestors up to top


 * 08 Diseases of the nervous system


 * Other disorders of the nervous system
 * 8E49 Postviral fatigue syndrome

Inclusions


 * Benign myalgic encephalomyelitis
 * chronic fatigue syndrome

History with Fibromyalgia
The WHO ICD-10 lists fibromyalgia as a "disease of the musculoskeletal system and connective tissue", diagnostic code M79.7.

ICD-10-CM

 * M79.7 Fibromyalgia


 * Fibromyositis
 * Fibrositis
 * Myofibrositis

In 2015, the United States finally adopted the 1992 ICD-10 and Fibromyalgia as a diagnosis.

ICD-11 (2019)
ICD-11 has diagnostic code MG30.1 Chronic widespread pain.


 * MG30.01 Chronic widespread pain

Parent


 * MG30.0 Chronic primary pain

Description


 * "Chronic widespread pain (CWP) is diffuse pain in at least 4 of 5 body regions and is associated with significant emotional distress (anxiety, anger/frustration or depressed mood) or functional disability (interference in daily life activities and reduced participation in social roles) [1]. CWP is multifactorial: biological, psychological and social factors contribute to the pain syndrome. The diagnosis is appropriate when the pain is not directly attributable to a nociceptive process in these regions and there are features consistent with nociplastic pain [2] and identified psychological and social contributors."

Inclusions


 * Fibromyalgia

Exclusions


 * Acute pain (MG31)

Online Presence
The WHO uses social media in many languages.

English language

 * Facebook
 * Instagram
 * Twitter
 * Website

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