Principles of Diagnosis of Mental Disorders According to ICD-10
The International Classification of Diseases provides physicians with a common language for describing mental pathology. The full text of this document contains the most detailed descriptions of inclusion and exclusion criteria. This is done specifically to prevent contradictory or double interpretation of the same conditions by different specialists.
Key diagnostic features:
- Syndrome Priority: The diagnosis is most often based on the careful identification of the leading syndrome or symptom.
- Multiple Coding: If a patient simultaneously exhibits disorders in several different mental spheres, the rules allow the use of several codes at once.
- Recording Dynamics: In certain categories of the classification, provisions are made to record the dynamics of disorders. A classic example here is the indication of the type of schizophrenia course.
- Ignoring the Cause in Complex Cases: When diagnosing certain conditions, the exact cause of the organic defect is not critical. For example, in oligophrenia, finding the root cause is often associated with immense difficulties, so the emphasis is placed on the current clinical state.
Coding Structure and WHO Approach
Diagnosis in psychiatric practice is presented as an alphanumeric code. It begins with the Latin letter F, which is assigned to the section of mental disorders, followed by up to four digits. Theoretically, such a mathematical system makes it possible to code up to 10,000 different mental disorders, but in reality, a huge portion of these possible codes remains unused.
It is important to remember that some diagnoses frequently encountered in a psychiatrist's practice lie completely outside the F class. Such exceptions include:
- Epilepsy (coded in the neurology section as G40).
- Neurosyphilis (classified under infections, code A52.1).
- Intoxications (coded in the range T36-65).
The World Health Organization (WHO) fundamentally does not view ICD-10 as a rigid theoretical system. The development of this guideline in no way supersedes conceptual classifications that reflect the historical level of scientific knowledge and the rich traditions of certain psychiatric schools.
Basic Concepts of Clinical Psychiatry
From the perspective of a practicing clinician, a correct formulation of the diagnosis requires indicating both the name of the disease itself and its leading syndrome. It is precisely this nosological diagnosis that primarily determines the further prognosis for the patient.
In clinical psychiatry, several fundamental categories of disorders are distinguished:
- Disease: Only a disorder characterized by the obligatory presence of a course can be called by this term.
- Endogenous Diseases: Their main and most important sign is considered to be an autochthonous course. This means that the pathology arises spontaneously, exclusively under the influence of hidden internal factors of the organism.
- Exogenous Disorders: These are mental disturbances directly caused by some somatic disease. In the vast majority of cases, they resemble classical exogenous (external) mental disorders.
- Psychogenic Disorders: In modern practice, all psychogenic mental disorders are specifically classified as functional disturbances.
- Pathological Development: A specific disorder caused by a person's prolonged stay in unusual, extremely exceptional conditions. These conditions turn out to be so powerful that they irreversibly affect the entire structure of a person's personality.
Briefly: answers to topical questions
Which nosologies are included in the group of anxiety and phobic disorders?
The group of anxiety and phobic disorders (category F40) includes agoraphobia, social phobias, and simple phobias.
These include:
- Agoraphobia — fear of open spaces, as well as fear of crowds or situations where the patient may be left without help.
- Social Phobias — recurring absurd fear of finding oneself in an embarrassing or humiliating situation (for example, during public speaking).
- Simple Phobias — persistent unmotivated fears and the tendency to avoid situations that trigger these apprehensions (for example, claustrophobia, cancerophobia).
What symptoms form the basis of the clinical picture of post-traumatic stress disorder (PTSD)?
The basis of the clinical picture of post-traumatic stress disorder consists of intrusive memories of the experienced tragic event and depressive symptomatology.
Key manifestations include:
- Intrusive memories of the stress.
- Sleep disorders (nightmares, fear of seeing the tragedy in a dream).
- Withdrawnness and a sense of internal numbness.
- Anhedonia (inability to experience pleasure).
Patients are also characterized by a refusal of medical help, an acute sense of being misunderstood by others, and distrust of doctors.
How do obsessions differ from compulsions in obsessive-compulsive disorder?
The main difference lies in the possibility of voluntary control, the severity of physical discomfort, and the risk of antisocial behavior.
| Sign | Obsessive drive | Compulsive drive |
|---|---|---|
| Possibility of voluntary control | Present (the patient can control the drive) | Almost absent |
| Critical attitude | Present | Present |
| Antisocial and absurd behavior | Impossible | High probability |
| Mechanism | Refusal to execute causes intense experiences and thoughts | Unsatisfied need causes an unbearable feeling of physical discomfort |
What specific syndromes belong to dissociative (conversion) disorders?
Dissociative (conversion) disorders include hysterical disorders of memory, consciousness, as well as motor and sensory impairments.
Specific syndromes include:
- Ganser Syndrome — refers to hysterical psychoses.
- Hysterical Fugue, Trance, Stupor — specific dissociative states.
- Dissociative Amnesia — forgetfulness as a defense mechanism.
- Hysterical Seizures — convulsions without loss of consciousness and bruising.
- Aphonia — short-term paralysis of the vocal cords.
- Mutism — refusal to speak for psychological reasons.
They also include transient paresis, paralysis, blindness, and deafness.
To memorize frequent diagnoses outside the psychiatric chapter (F), use the abbreviation ANI: Epilepsy (G40), Neurosyphilis (A52.1), Intoxications (T36-65).
Class and exam questions
What is the main guideline when prescribing psychopharmacotherapy?
The prescription of any psychopharmacological agents is always carried out in strict accordance with the patient's leading syndrome identified.
What is the main distinction of a true disease?
A condition can only be called a disease in psychiatry if it is characterized by a specific clinical course over time.
What is the role of ICD-10 in Russia?
ICD-10 serves as the official and sole basis for maintaining all state statistics in the field of domestic psychiatry.
What else to study on this topic
- Features of the autochthonous course in endogenous diseases
- The relationship between somatic diseases and exogenous psychiatric disorders
- Inclusion and exclusion criteria for making an accurate diagnosis
- Dynamics of disorders using the types of schizophrenia course as an example
- Mechanisms of pathological personality development under extreme conditions
Master the entire topic in the "Psychiatry" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Neurotic, stress-related and somatoform disorders" and 499 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 7 video lessons on the subject
Other topics in "Chapter 18. Classification of Mental Disorders"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.