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