Definition: This block contains a wide variety of disorders that differ in severity and clinical form but that are all attributable to the use of one or more psychoactive substances, which may or may not have been medically prescribed. The third character of the code identifies the substance involved, and the fourth character specifies the clinical state. The codes should be used, as required, for each substance specified, but it should be noted that not all fourth character codes are applicable to all substances. Identification of the psychoactive substance should be based on as many sources of information as possible. These include self-report data, analysis of blood and other body fluids, characteristic physical and psychological symptom ...[+++]s, clinical signs and behaviour, and other evidence such as a drug being in the patient's possession or reports from informed third parties. Many drug users take more than one type of psychoactive substance. The main diagnosis should be classified, whenever possible, according to the substance or class of substances that has caused or contributed most to the presenting clinical syndrome. Other diagnoses should be coded when other psychoactive substances have been taken in intoxicating amounts (common fourth character .0) or to the extent of causing harm (common fourth character .1), dependence (common fourth character .2) or other disorders (common fourth character .3-.9). Only in cases in which patterns of psychoactive substance-taking are chaotic and indiscriminate, or in which the contributions of different psychoactive substances are inextricably mixed, should the diagnosis of disorders resulting from multiple drug use (F19.-) be used. | Modifiers The following fourth-character subdivisions are for use with categories F10-F19: Code Title .0 Acute intoxication A condition that follows the administration of a psychoactive substance resulting in disturbances in level of consciousness, cognition, perception, affect or behaviour, o ...

Modifiers The following fourth-character subdivisions classify morphological changes and are for use with categories N00-N07. Subdivisions .0-.8 should not normally be used unless these have been specifically identified (e.g. by renal biopsy or autopsy). The three-character categories relate to clinical syndromes. Code Title .0 Minor glomerular abnormality Minimal change lesion .1 Focal and segmental glomerular lesions Focal and segmental:hyalinosis | sclerosis | Focal glomerulonephritis .2 Diffuse membranous glomerulonephritis .3 Diffuse mesangial proliferative glomerulonephritis .4 Diffuse endocapillary proliferative glomerulonephritis ...[+++] .5 Diffuse mesangiocapillary glomerulonephritis Membranoproliferative glomerulonephritis, types 1 and 3, or NOS .6 Dense deposit disease Membranoproliferative glomerulonephritis, type 2 .7 Diffuse crescentic glomerulonephritis Extracapillary glomerulonephritis .8 Other Proliferative glomerulonephritis NOS .9 Unspecified | Minimal change lesion | Focal and segmental:hyalinosis | sclerosis | Focal glomerulonephritis | Membranoproliferative glomerulonephritis, types 1 and 3, or NOS | Membranoproliferative glomerulonephritis, type 2 | Extracapillary glomerulonephritis | Proliferative glomerulonephritis NOS

Definition: Considerable cultural variations occur in the presentation of this disorder, and two main types occur, with substantial overlap. In one type, the main feature is a complaint of increased fatigue after mental effort, often associated with some decrease in occupational performance or coping efficiency in daily tasks. The mental fatiguability is typically described as an unpleasant intrusion of distracting associations or recollections, difficulty in concentrating, and generally inefficient thinking. In the other type, the emphasis is on feelings of bodily or physical weakness and exhaustion after only minimal effort, accompanie ...[+++]d by a feeling of muscular aches and pains and inability to relax. In both types a variety of other unpleasant physical feelings is common, such as dizziness, tension headaches, and feelings of general instability. Worry about decreasing mental and bodily well-being, irritability, anhedonia, and varying minor degrees of both depression and anxiety are all common. Sleep is often disturbed in its initial and middle phases but hypersomnia may also be prominent. | Fatigue syndrome

Beta-glucuronidase deficiency Mucopolysaccharidosis, types III, IV, VI, VII Syndrome:Maroteaux-Lamy (mild)(severe) | Morquio(-like)(classic) | Sanfilippo (type B)(type C)(type D)

Disease:Charcot-Marie-Tooth | Déjerine-Sottas | Hereditary motor and sensory neuropathy, types I-IV Hypertrophic neuropathy of infancy Peroneal muscular atrophy (axonal type)(hypertrophic type) Roussy-Lévy syndrome

A rare genetic syndromic intellectual disability characterized by mild intellectual disability, short stature with high body mass index, short neck with cervical gibbus and dysmorphic facial features. A metabolic syndrome, including type 2 diabetes,

This syndrome has characteristics of Hirschsprung disease and absence or hypoplasia of the nails and distal phalanges of the thumbs and great toes (type D brachydactyly). It has been described in four males from one family (two brothers and two mater

A rare multiple malformation syndrome with characteristics of severe intrauterine growth retardation, severe microcephaly with a sloping forehead, severe ichthyosis (collodion baby type), and facial dysmorphism. Severe central nervous system defects

A rare genetic syndromic intellectual disability characterised by mild intellectual disability, short stature with high body mass index, short neck with cervical gibbus and dysmorphic facial features. A metabolic syndrome, including type 2 diabetes,