ICD 10 codes are organized in 22 chapters as listed below:
- 1: A00-B99 – Certain infectious and parasitic diseases
- 2: C00-D48 – Neoplasms
- 3: D50-D89 – Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
- 4: E00-E90 – Endocrine, nutritional and metabolic diseases
- 5: F01-F99 – Mental and behavioral disorders
- 6: G00-G99 – Diseases of the nervous system
- 7: H00-H59 – Diseases of the eye and adnexa
- 8: H60-H95 – Diseases of the ear and mastoid process
- 9: I00-I99 – Diseases of the circulatory system
- 10: J00-J99 – Diseases of the respiratory system
- 11: K00-K93 – Diseases of the digestive system
- 12: L00-L99 – Diseases of the skin and subcutaneous tissue
- 13: M00-M99 – Diseases of the musculoskeletal system and connective tissue
- 14: N00-N99 – Diseases of the genitourinary system
- 15: O00-O99 – Congenital malformations, deformations and chromosomal abnormalities
- 16: P00-P96 – Certain conditions originating in the perinatal period
- 17: Q00-Q99 – Congenital malformations, deformations and chromosomal abnormalities
- 18: R00-R99 – Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- 19: S00-T98 – Injury, poisoning and certain other consequences of external causes
- 20: V01-Y98 – External causes of morbidity and mortality
- 21: Z00-Z99 – Factors influencing health status and contact with health services
- 22: U00-U99 – Codes for special purposes
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