ICD-10 Chapter V: Mental and Behavioural Disorders
(In ICD-11, this chapter will be known as “Chapter 5″.)
ICD-10 Chapter V is also published as a separate publication known as the “Blue Book” and available as a PDF:
ICD-10 Classification of Mental and Behavioural Disorders Clinical descriptions and diagnostic guidelines: http://www.who.int/classifications/icd/en/bluebook.pdf
This is how “Fatigue syndrome” and “Neurasthenia” are classified in ICD-10 Chapter V:
(Please refer to the “Blue Book” and to ICD-10 Online Version: 2010 for full categories, category descriptions, inclusions and exclusions.)
Mental and behavioural disorders
Neurotic, stress-related and somatoform disorders
F45 Somatoform disorders
F45.0 Somatization disorder
F45.1 Undifferentiated somatoform disorder
F45.8 Other somatoform disorders
F45.9 Somatoform disorder, unspecified
Psychosomatic disorder NOS
F48 Other neurotic disorders
F48.0 Neurasthenia [Ed: Lengthy textual description of symptoms for neurasthenia omitted]
Fatigue syndrome [Ed: Note: not "postviral"; not "chronic"]
Use additional code, if desired, to identify previous physical illness.
Excludes: asthenia NOS ( R53 )
burn-out ( Z73.0 )
malaise and fatigue ( R53 )
postviral fatigue syndrome ( G93.3 )
psychasthenia ( F48.8 )
Correspondence between DSM-IV and ICD-10
There is a degree of correspondence between the current DSM-IV Somatoform Disorders categories and the equivalent section in ICD-10: Chapter V. This table sets out how the two classification systems currently correspond for Somatoform Disorders .
Current DSM-IV Codes and Categories for Somatoform Disorders and ICD-10 Equivalents
 Source: Mayou R, Kirmayer LJ, Simon G, Kroenke K, Sharpe M: Somatoform disorders: time for a new approach in DSM-V. Am J Psychiat. 2005;162:847–855. [Neurasthenia (classified in ICD-10: Chapter V at F48.0) is not categorized in DSM-IV.]
ICD-10 Chapter XVIII
(In ICD-11, this chapter will be known as “Chapter 18″.)
Note the following classifications under R53 Malaise and fatigue. See “Notes” regarding R53.82 and US ICD-10-CM.
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
General symptoms and signs
R53 Malaise and fatigue
General physical deterioration
· congenital ( P96.9 )
· senile ( R54 )
exhaustion and fatigue (due to)(in):
· combat ( F43.0 )
· excessive exertion ( T73.3 )
· exposure ( T73.2 )
· heat ( T67.- )
· neurasthenia ( F48.0 )
· pregnancy ( O26.8 )
· senile asthenia ( R54 )
fatigue syndrome ( F48.0 )
· postviral ( G93.3 )
What are the issues?
For ICD-11, all three Volumes of ICD will be electronically published and integrable.
This site makes no assumptions about what proposals might be made by any of the Topic Advisory Groups for the inclusion of “Chronic fatigue syndrome” in Volume 1: The Tabular List, in ICD-11.
For most recent udpate on proposals for ICD-11 see: Post #96: July 3, 2011: http://wp.me/pKrrB-1eb
• This site will monitor the progress of the revision of ICD-10 Chapter VI: Diseases of the nervous system (the Neurological chapter) with specific reference to the three classifications coded to G93.3 in Volume 1: The Tabular List: Postviral fatigue syndrome; Benign myalgic encephalomyelitis; and indexed to code G93.3 in Volume 3: The Alphabetical Index: Chronic fatigue syndrome.
Content in ICD-11 will be populated for thirteen parameters, in accordance with the ICD-11 Content Model Style Guide. There is the potential for considerably more content to be included for diseases, disorders and syndromes in ICD-11 than appears in ICD-10, including Definition, Inclusions and Causal Mechanisms.
It is not known how much additional information might be included in ICD-11 for the three terms currently classified at, or indexed to, G93.3. Content will need to be monitored as it is generated, as will any changes to the hierarchy between these three terms, as will specification of the relationships between the three terms.
• This site will monitor the population of content proposed for inclusion in ICD-11 for these three entities.
This site makes no assumptions about what proposals might be made by the Topic Advisory Group for Mental and Behavioural Disorders (TAG MH) for the revision of the Somatoform Disorders section in ICD-10 Chapter V; or whether, and to what extent, the Topic Advisory Group for Mental and Behavioural Disorders might seek to achieve congruency between category names, glossary descriptions and criteria in Chapter V with those within a restructured DSM Somatoform Disorders section (proposed to be renamed “Somatic Symptom Disorders”) or whatever name might eventually be adopted for this section in DSM-5.
• This site will monitor the progress of the revision of the Somatoform Disorders section in ICD-10 Chapter V with specific reference to those categories currently classified between F45 – F48.0 and also monitor the revision of the corresponding DSM-IV Somatoform Disorders section which the DSM-5 Somatic Symptom Disorders Work Group is proposing to rename and potentially restructure.
Forthcoming US “Clinical Modification” ICD-10-CM
ICD-10-CM, a “Clinical Modification” of ICD-10, is scheduled for implementation on October 1, 2013 and has been subject to partial code freeze since October 1, 2011. It will replace the US specific ICD-9-CM.
Current and long-standing proposals for ICD-10-CM propose classifying Chronic fatigue syndrome under Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99) at R53.82
For a history of the coding of PVFS, ME and CFS in ICD to March 2001, see the CDC document:
A Summary of Chronic Fatigue Syndrome and Its Classification in the International Classification of Diseases CDC archive document, March 2001.
NCHS proposals, as they stood at March 2001, as set out in this document, were later superceded.
For the most recent ICD-10-CM proposals see:
The 2012 update of ICD-10-CM is now available and replaces the December 2011 release. 
 Although this release of ICD-10-CM is now available for public viewing, the codes in ICD-10-CM are not currently valid for any purpose or use. The effective implementation date for ICD-10-CM (and ICD-10-PCS) is October 1, 2013. Updates to this version are anticipated prior to implementation of ICD-10-CM.
Partial Code Freeze
A Partial Code Freeze for ICD-10-CM was implemented on October 1, 2011. For information on the implications for Partial Code Freeze please refer to this CDC website page:
and see this PDF document Partial Code Freeze
Discussion of whether and when to implement a Partial Code Freeze for ICD-10-CM was tabled for discussion at the March 9, 2010 public meeting of the ICD-9-CM Coordination and Maintenance Committee. Transcript here from Page 10 onwards; includes contributions from Darrel Regier, MD, Vice-chair, DSM-5 Task Force, American Psychiatric Association.
Proposed classifications and codings for ICD-10-CM (2012 update, replaces December 2011 version)
ICD-10-CM TABULAR LIST of DISEASES and INJURIES
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
[...] See document for full text
Note: This is not the ICD-10-CM Mental and Behavioural chapter which is:
Mental and behavioral disorders (F01-F99)
Includes: disorders of psychological development
Excludes2: symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
ICD-10-CM CHAPTER 18
Tabular List of Diseases and Injuries Page 954 2012 Release
R53 Malaise and fatigue
R53.8 Other malaise and fatigue
Excludes1: combat exhaustion and fatigue (F43.0)
congenital debility (P96.9)
exhaustion and fatigue due to:
depressive episode (F32.-)
excessive exertion (T73.3)
recurrent depressive episode (F33)
senile debility (R54)
R53.81 Other malaise
General physical deterioration
Excludes1: age-related physical debility (R54)
R53.82 Chronic fatigue, unspecified
Chronic fatigue syndrome NOS
Excludes1: postviral fatigue syndrome (G93.3)
R53.83 Other fatigue
Lack of energy
ICD-10-CM CHAPTER 6Page 271 2012 release
Diseases of the nervous system (G00-G99)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
G93 Other disorders of brain
G93.3 Postviral fatigue syndrome
Benign myalgic encephalomyelitis
Excludes1: chronic fatigue syndrome NOS (R53.82)