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 ).
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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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