1. INTERNATIONAL CLASSIFICATION OF DISEASES ASSOC. PROF. D-R PETKO SALCHEV PhD

2. Factors influencing the development of ICD-Х Extensive usage of ICD requiring a rethinking of its structure; The need to create a stable and adaptable classification which doesn’t need fundamental restructuring for a number of years; A necessity for conducting consultations among many organizations and countries; Field testing required.

3. Common principles of disease classification It should be restricted to a certain number of mutually exempt headings; Each diseases or pathological state should occupy a strictly defined place in the list of headings; The specific disease should be positioned under a separate heading; It should possess hierarchical structure.

4. Diseases are grouped in the following way (according to William Farr) Epidemic diseases; Constitutional or general diseases; Local diseases grouped according to anatomical localization; Diseases related to development; Traumatic diseases.

5. Disease classes and codes according to ICD-9 and ICD-10 ICD-9ICD-10 Class I. Infectious and parasitic diseases (001–139) Class II. Tumors (140–239) Class III. Diseases of the endocrine glands, nutrition, metabolism and immunity disorders (240–279) Class IV. Diseases of the blood and haemopoesis (280–289) Class V. Psychic disorders (290-319) Class VI. Diseases of the nervous system and sensory organs (320–389) Class VII. Diseases of the haemopoetic organs (390–459) Class VIII. Pulmonary diseases (460–519) Class IХ. Digestive diseases (520–579) Class Х. Genito-urinary diseases (580–629) Class XI. Complications of pregnancy, birth and post-delivery period (630– 676) Class XII. Diseases of the skin and subcutaneous tissues (680–709) Class XIII. Diseases of the skeleto-muscular system and connective tissue (710–739) Class XIV. Genetic disorders (740–759) Class XV. Some states, occurring during the perinatal period (760–779) Class XVI. Symptoms, signs and undefined conditions (780–799) Class XVII. Trauma and poisonings (800–999) Additional classifications: External causes of trauma and poisonings (code Е) Factors, influencing health and the motives defining the demand for medical help (code V) Class I. Some infectious and parasitic diseases (А00–В99) Class II. Tumors (C00–D48) Class III. Diseases of the blood, haemopoesis and separate disorders, including the immunological mechanism (D50–D89) Class IV. Diseases of the endocrine glands, nutritional and metabolic disorders (Е00–Е90) Class V. Psychic and behavioral disorders (F00–F99) Class VI. Diseases of the nervous system (G00–G99) Class VII. Diseases of the eye and its adjuncts (Н00–Н59) Class VIII. Diseases of the ear and mastoid (Н60–Н95) Class IX. Diseases of the haemopoetic organs (I00–I99) Class X. Pulmonary diseases (J00–J99) Class XI. Digestive diseases (К00–К93) Class XII. Diseases of the skin and subcutaneous tissues (L00–L99) Class XIII. Diseases of the skeleto-muscular system and connective tissue (М00– М99) Class XIV. Genito-urinary diseases (N00–N99) Class XV. Pregnancy, birth and post-delivery period (О00–О99) Class XVI. Some states, occurring during the perinatal period (P00–P96) Class XVII. Genetic disorders [developmental defects], deformities and chromosomal aberrations (Q00–Q99) Class XVIII. Symptoms, signs and deviations from the norm, discovered during clinical and laboratory examinations, not classified elsewhere (R00–R99) Class XIX. Trauma, poisonings and some other consequences of external causal influences (S00–T98) Class XX. External causes for morbidity and mortality (V01–Y98) Class XXI. Factors, influencing the health state of the population and its contacts with the health service (Z00–Z99)

6. Other types of classifications used in practice Classifications based on diagnoses Non-diagnostic classifications

7. Classifications based on diagnoses – International classification of tumor diseases (ICD–О) – 1990, published by WHO – International Coding Index for Dermatology – 1978 – Application of the International Classification of Diseases to Dentistry and Stomatology – ICD-DA – Application of the International Classification of Diseases to Rheumatology and Orthopedics – ICD – R& O – The ICD-10 Classification of Mental and Behavioral Disorders: clinical descriptions and diagnostic guidelines – 1992

8. Non-diagnostic classifications – On the basis of procedures – International classification of procedures in medicine (ICPM) – 1978. – On the basis of disease consequences – International classification of disorders, disability and handicap - 1980.