ICD-10: ME, CFS

Part Two

ICD-10 Chapter V: Mental and Behavioural Disorders

(In ICD-11, this chapter is known as “Chapter 06”.)

ICD-10 Chapter V is also published as a specialty publication known as the “Blue Book” and is available as a PDF. This expands on the brief disorder descriptions in the Tabular List and includes diagnostic guidelines.

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:

Tabular List ICD-10 Version: 2019

Note the exclusion of Malaise and fatigueR53 ) and Postviral fatigue syndrome ( G93.3 ).

(Please refer to the “Blue Book” and to ICD-10 Online Version: 2019 for full categories, category descriptions, inclusions and exclusions.)

https://icd.who.int/browse10/2019/en#/F45

Chapter V

Mental and behavioural disorders

(F00-F99)

Neurotic, stress-related and somatoform disorders

(F40-F48)

[…]

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 was a degree of correspondence between the DSM-IV Somatoform Disorders categories and the equivalent disorder section in ICD-10: Chapter V. This table sets out how the two classification systems corresponded for Somatoform Disorders [1].

(The now retired) DSM-IV Codes and Categories for Somatoform Disorders and the ICD-10 Equivalents:

[1] 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 21”.)

Note the following classifications under R53 Malaise and fatigue. See “Notes” regarding R53.82 and US ICD-10-CM.

Note exclusion of Fatigue syndrome (F48.0) and Postviral fatigue syndrome (G93.3).

https://icd.who.int/browse10/2019/en#/R53

Chapter XVIII

Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

(R00-R99)

General symptoms and signs

(R50-R69)

[…]

R53 Malaise and fatigue

Asthenia NOS

Debility:

· NOS

· chronic

· nervous

General physical deterioration

Lethargy

Tiredness

Excludes:  debility:

· 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)

 

ICD-11

For the most recent information on classification and coding of Postviral fatigue syndrome; Myalgic encephalomyelitis; and Chronic fatigue syndrome in ICD-10 and ICD-11 see my November 2020 report:

Update on classification and coding of PVFS, ME and CFS for ICD-11, v7 | November 2020

Content in ICD-11 will be populated for 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 Descriptions.

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