Chapter	Code Range	Description
1	A00-B99	Certain infectious and parasitic diseases
2	C00-D49	Neoplasms
3	D50-D89	Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
4	E00-E89	Endocrine, nutritional and metabolic diseases
5	F01-F99	Mental, Behavioral and Neurodevelopmental 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-K95	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	Pregnancy, childbirth and the puerperium
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-T88	Injury, poisoning and certain other consequences of external causes
20	V00-Y99	External causes of morbidity
21	Z00-Z99	Factors influencing health status and contact with health services