The index and the tabular list, together
Look it up the way the book reads. Verify the code. See its HCC mapping.
Need the rules rather than a code? Read the FY 2026 ICD-10 guidelines
Tabular list
22 chaptersA00-B99
Certain infectious and parasitic diseases
C00-D49
Neoplasms
D50-D89
Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
E00-E89
Endocrine, nutritional and metabolic diseases
F01-F99
Mental, Behavioral and Neurodevelopmental disorders
G00-G99
Diseases of the nervous system
H00-H59
Diseases of the eye and adnexa
H60-H95
Diseases of the ear and mastoid process
I00-I99
Diseases of the circulatory system
J00-J99
Diseases of the respiratory system
K00-K95
Diseases of the digestive system
L00-L99
Diseases of the skin and subcutaneous tissue
M00-M99
Diseases of the musculoskeletal system and connective tissue
N00-N99
Diseases of the genitourinary system
O00-O9A
Pregnancy, childbirth and the puerperium
P00-P96
Certain conditions originating in the perinatal period
Q00-QA0
Congenital malformations, deformations and chromosomal abnormalities
R00-R99
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
S00-T88
Injury, poisoning and certain other consequences of external causes
V00-Y99
External causes of morbidity
Z00-Z99
Factors influencing health status and contact with health services
U00-U85
Codes for special purposes
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