ICD-10-CM Classification Chapters
The International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) organizes diagnosis codes into 22 chapters. Each chapter covers a body system or category of conditions. Browse the chapters below to explore specific code ranges and sections.
Chapter 1
A00 — B99Certain infectious and parasitic diseases (A00-B99)
Chapter 10
J00 — J99Diseases of the respiratory system (J00-J99)
Chapter 11
K00 — K95Diseases of the digestive system (K00-K95)
Chapter 12
L00 — L99Diseases of the skin and subcutaneous tissue (L00-L99)
Chapter 13
M00 — M99Diseases of the musculoskeletal system and connective tissue (M00-M99)
Chapter 14
N00 — N99Diseases of the genitourinary system (N00-N99)
Chapter 15
O00 — O9APregnancy, childbirth and the puerperium (O00-O9A)
Chapter 16
P00 — P96Certain conditions originating in the perinatal period (P00-P96)
Chapter 17
Q00 — QA0Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA0)
Chapter 18
R00 — R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Chapter 19
S00 — T88Injury, poisoning and certain other consequences of external causes (S00-T88)
Chapter 2
C00 — D49Neoplasms (C00-D49)
Chapter 20
V00 — Y99External causes of morbidity (V00-Y99)
Chapter 21
Z00 — Z99Factors influencing health status and contact with health services (Z00-Z99)
Chapter 22
U00 — U49Codes for special purposes (U00-U85)
Chapter 3
D50 — D89Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
Chapter 4
E00 — E89Endocrine, nutritional and metabolic diseases (E00-E89)
Chapter 5
F01 — F99Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
Chapter 6
G00 — G99Diseases of the nervous system (G00-G99)
Chapter 7
H00 — H59Diseases of the eye and adnexa (H00-H59)
Chapter 8
H60 — H95Diseases of the ear and mastoid process (H60-H95)
Chapter 9
I00 — I99Diseases of the circulatory system (I00-I99)
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