ICD-10 Codes for Mental Disorders

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F00-F09 Organic, including symptomatic, mental disorders.
F10-F19 Mental and behavioral disorders due to psychoactive substance abuse.
F20-F29 Schizophrenia, schizotypal and delusional disorders.
F30-F39 Mood (affective) disorders.
F40-F48 Neurotic, stress-related and somatoform disorders.
F50-F59 Behavioral syndromes associated with physiological disturbances and physical factors
F60-F69 Disorders of adult personality and behavior
F70-F79 Mental retardation
F80-F89 Disorders of psychological development
F90-F98 Behavioral emotional disorders with onset usually occurring in childhood or adolescence

ICD-10 codes consist of a single letter followed by 3 or more digits, with a decimal point between the second and third ( e.g K35.1, "Acute Appendicitis with peritoneal abscess" ). As there are many thousands of variations at the 4 character level - where all three digits are used - it is common practice to summarize at the 3 character level ( e.g. K35, "Acute appendicitis", which includes peritoneal abscess and all other forms of the condition ).

The diagnoses are presented in code order ( i.e. rather than by the diagnosis name ). The list of ICD-10 chapters below should help you locate the particular diagnosis you require from these tables:

Codes:

A and B Certain infectious and parasitic diseases.
C00 to D48 Neoplasms.
D50 to D89 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.
E Endocrine, nutritional and metabolic diseases.
F Mental and behavioral disorders.
G Diseases of the nervous system.
H00 to H59 Diseases of the eye and adnexa.
H60 to H95 Diseases of the ear and mastoid process.
I Diseases of the circulatory system.
J Diseases of the respiratory system.
K Diseases of the digestive system.
L Diseases of the skin and subcutaneous tissue.
M Diseases of the musculoskeletal system and connective tissue.
N Diseases of the genitourinary system.
O Pregnancy, childbirth and the puerperium.
P Certain conditions originating in the perinatal period.
Q Congenital malformations, deformations and chromosomal abnormalities.
R Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
S and T Injury, poisoning and certain other consequences of external causes.
U This letter is currently left vacant.
V, W, X and Y External causes of morbidity and mortality.
Z Factors influencing health status and contact with health services.

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